vault backup: 2026-03-03 12:21:57
This commit is contained in:
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: 107 Morgan Street
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# 107 Morgan Street
|
||||
|
||||
@@ -22,6 +22,7 @@ year: 1960
|
||||
description: |
|
||||
Frontpage newspaper article noting the accidental death
|
||||
of Rev. Dr. William Hamilton Bill Alexander and his wife Marylouise.
|
||||
dg-publish: false
|
||||
---
|
||||
# Rev. William Alexander And Wife Killed In Airplane Crash
|
||||
|
||||
|
||||
+5
-3
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: 1990 K Street
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# 1990 K Street
|
||||
|
||||
@@ -6,6 +6,7 @@ tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/incomplete
|
||||
dg-publish: true
|
||||
---
|
||||
# 2009 Honda Civic
|
||||
|
||||
|
||||
@@ -7,5 +7,6 @@ tags:
|
||||
- destiny/permanent
|
||||
- occupational/project
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# 2100 Crystal Drive
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: 450-460 James Robertson Parkway
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# 450-460 James Robertson Parkway
|
||||
|
||||
@@ -6,6 +6,7 @@ tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/incomplete
|
||||
dg-publish: false
|
||||
---
|
||||
# 463 Davison Ave NE
|
||||
|
||||
|
||||
@@ -11,6 +11,7 @@ tags:
|
||||
- type/media/book
|
||||
author: Erving Goffman
|
||||
date: 1959
|
||||
dg-publish: false
|
||||
---
|
||||
# The Presentation of Self in Everyday Life
|
||||
|
||||
|
||||
@@ -1,3 +1,16 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- LICENSE
|
||||
title: UNLICENSE
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- status/complete
|
||||
- topic/meta
|
||||
---
|
||||
# UNLICENSE
|
||||
|
||||
This is free and unencumbered software released into the public domain.
|
||||
|
||||
Anyone is free to copy, modify, publish,
|
||||
|
||||
+6
-1
@@ -2,7 +2,12 @@
|
||||
id:
|
||||
aliases: []
|
||||
title: Advanced Tables
|
||||
tags: []
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/uncertain
|
||||
- status/incomplete
|
||||
- topic/meta
|
||||
dg-publish: true
|
||||
---
|
||||
# Advanced Tables
|
||||
|
||||
|
||||
@@ -1,6 +1,5 @@
|
||||
filters:
|
||||
and:
|
||||
- file.folder == "/"
|
||||
- file.ext == "md"
|
||||
- '!file.basename.endsWith(".excalidraw")'
|
||||
views:
|
||||
|
||||
@@ -7,5 +7,6 @@ tags:
|
||||
- destiny/permanent
|
||||
- occupational/project
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Belle Meade Plaza
|
||||
|
||||
@@ -0,0 +1,19 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title: Empirical Model-Building and Response Surfaces
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- topic/math/statistics
|
||||
- type/media/book
|
||||
dg-publish: false
|
||||
authors:
|
||||
- George E. P. Box
|
||||
- Norman Richard Draper
|
||||
date: 1987
|
||||
---
|
||||
# Empirical Model-Building and Response Surfaces
|
||||
|
||||
## The Use of Approximating Functions
|
||||
@@ -16,6 +16,7 @@ origlanguage: Czech
|
||||
translator: Dora Round
|
||||
type: incollection
|
||||
year: 1935
|
||||
dg-publish: false
|
||||
---
|
||||
# From the Point of View of a Cat
|
||||
|
||||
|
||||
@@ -13,6 +13,7 @@ authors:
|
||||
- James Clear
|
||||
published: 2018-10-16
|
||||
type: book
|
||||
dg-publish: false
|
||||
---
|
||||
# Atomic Habits
|
||||
|
||||
|
||||
@@ -7,6 +7,8 @@ tags:
|
||||
- destiny/permanent
|
||||
- occupational
|
||||
- type/media
|
||||
- status/incomplete
|
||||
dg-publish: true
|
||||
---
|
||||
# ConEst Pre-Takeoff Email Template
|
||||
|
||||
@@ -49,10 +51,10 @@ Please confirm you have received this email and respond with any questions or co
|
||||
* Cover Material:
|
||||
%% Covers: Brass, Aluminum %%
|
||||
* Wiring Devices:
|
||||
* Units:
|
||||
%% 15A Decora %%
|
||||
* BOH/Common Areas:
|
||||
%% 20A Toggle %%
|
||||
* Units:
|
||||
%% 15A Decora %%
|
||||
* BOH/Common Areas:
|
||||
%% 20A Toggle %%
|
||||
* Switchboards/Panelboards:
|
||||
%% Acceptable Manufacturers, AL or CU Bussing, Breaker Types (Snap-on, bolt on), ACI Ratings %%
|
||||
* Transformers:
|
||||
@@ -62,7 +64,8 @@ Please confirm you have received this email and respond with any questions or co
|
||||
|
||||
### Project Drawing/Detail Callouts
|
||||
|
||||
* Describe conflicts between drawings / proposal: %% Plans show CU feeders, proposal calls for aluminum, Specification grade devices, etc. %%
|
||||
* Describe conflicts between drawings / proposal:
|
||||
%% "Plans show CU feeders, proposal calls for aluminum", Specification grade devices, etc. %%
|
||||
|
||||
* Cost drivers in details not shown elsewhere on plans:
|
||||
|
||||
|
||||
@@ -0,0 +1,46 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title: Create Your Own Vault
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/incomplete
|
||||
dg-publish: true
|
||||
---
|
||||
# Create Your Own Vault
|
||||
|
||||
## Setup Obsidian
|
||||
|
||||
1. Download and install [Obsidian](https://obsidian.md/)
|
||||
|
||||
2. Open Obsidian and select "Create New Vault".
|
||||
|
||||
## Create a GitHub Repository
|
||||
|
||||
1. Create a [GitHub](https://github.com/)
|
||||
account if you don't have one already.
|
||||
|
||||
2. Install [[git|Git]] via the `winget` package manager:
|
||||
|
||||
```
|
||||
winget install Git.Git
|
||||
```
|
||||
|
||||
%% TODO: %%
|
||||
|
||||
## Create and Push your Vault
|
||||
|
||||
```
|
||||
git init
|
||||
git commit -m "initial commit"
|
||||
git branch -M main
|
||||
git remote add origin https://github.com/ExampleName/myVault.git
|
||||
git push -u origin main
|
||||
```
|
||||
|
||||
## Set Up Your Vault
|
||||
|
||||
Add and enable the Git Community Plugin.
|
||||
|
||||
%% TODO: %%
|
||||
@@ -7,6 +7,7 @@ tags:
|
||||
- destiny/permanent
|
||||
- status/incomplete
|
||||
- type/encyclopedia-entry
|
||||
dg-publish: true
|
||||
---
|
||||
# C\#
|
||||
|
||||
|
||||
@@ -2,7 +2,11 @@
|
||||
id:
|
||||
aliases: []
|
||||
title: Digital Garden Homepage
|
||||
tags: []
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent/entry-point
|
||||
- status/incomplete
|
||||
- topic/meta
|
||||
dg-home: true
|
||||
dg-publish: true
|
||||
---
|
||||
|
||||
@@ -7,6 +7,7 @@ tags:
|
||||
- destiny/permanent
|
||||
- type/task
|
||||
- status/incomplete
|
||||
dg-publish: true
|
||||
---
|
||||
# E-Ink Tablet
|
||||
|
||||
|
||||
@@ -8,6 +8,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/ergonomics/organizational
|
||||
- type/encyclopedia-entry
|
||||
dg-publish: true
|
||||
---
|
||||
# Earned Value Management
|
||||
|
||||
|
||||
+5
-3
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Elliot St. Hotel
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Elliot St. Hotel
|
||||
|
||||
@@ -8,6 +8,7 @@ tags:
|
||||
- destiny/permanent/entry-point
|
||||
- status/incomplete
|
||||
- type/supertopic
|
||||
dg-publish: true
|
||||
---
|
||||
# Ergonomics
|
||||
|
||||
|
||||
+2
-1
@@ -8,7 +8,8 @@ tags:
|
||||
- status/not-started
|
||||
- topic/estimating
|
||||
- type/encyclopedia-entry
|
||||
dg-publish: true
|
||||
---
|
||||
# Estimating Golf
|
||||
|
||||
[[2025-12-18#Estimating Golf]]
|
||||
[[2025-12-18_14-18-00]]
|
||||
@@ -0,0 +1,15 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title: Git
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Git
|
||||
|
||||
[Git](https://git-scm.com/) is a **version control system**
|
||||
|
||||
Git was created by Linus Torvalds
|
||||
+5
-3
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Grand Concourse
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Grand Concourse
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Hampton Roads Navy - Newport News
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Hampton Roads Navy - Newport News
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Hampton Roads Navy - Norfolk
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Hampton Roads Navy - Norfolk
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Harborside Plaza 4
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Harborside Plaza 4
|
||||
|
||||
+1
-1
@@ -19,7 +19,7 @@ while still producing a satisfactory result.
|
||||
The namesake rule of the rule of thumb
|
||||
is that the width of one's thumb is about an inch.
|
||||
With that heuristic,
|
||||
one can closely approximate small dimensions
|
||||
one can closely approximate small dimensions,
|
||||
even without the proper tools.
|
||||
|
||||
## See Also
|
||||
|
||||
@@ -9,6 +9,7 @@ tags:
|
||||
- status/incomplete
|
||||
authors:
|
||||
- Mike C. Holt
|
||||
dg-publish: false
|
||||
pages: 234
|
||||
publisher: Mike Holt Enterprises
|
||||
type: book
|
||||
|
||||
@@ -2,7 +2,12 @@
|
||||
id:
|
||||
aliases: []
|
||||
title: _How to Measure Anything in Project Management_
|
||||
tags: []
|
||||
tags:
|
||||
- authorship/other-for-now
|
||||
- destiny/permanent
|
||||
- status/incomplete
|
||||
- topic/organization
|
||||
dg-publish: true
|
||||
---
|
||||
# _How to Measure Anything in Project Management_
|
||||
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Howard University East Towers
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Howard University East Towers
|
||||
|
||||
+5
-3
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Hoxton Hotel
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Hoxton Hotel
|
||||
|
||||
@@ -13,6 +13,7 @@ authors: Douglas W. Hubbard
|
||||
publisher: John Wiley & Sons, Inc.
|
||||
type: book
|
||||
year: 2020
|
||||
dg-publish: false
|
||||
---
|
||||
# The Failure of Risk Management: Why It's Broken and How to Fix It, Second Edition
|
||||
|
||||
|
||||
@@ -9,5 +9,6 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Chapter 2: Definitions
|
||||
|
||||
@@ -9,5 +9,6 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Chapter 3: Occupancy Classification and Use
|
||||
|
||||
@@ -9,5 +9,6 @@ tags:
|
||||
- topic/construction
|
||||
- type/media/reference
|
||||
title: "Chapter 5: General Building Heights and Areas"
|
||||
dg-publish: false
|
||||
---
|
||||
# Chapter 5: General Building Heights and Areas
|
||||
|
||||
@@ -9,5 +9,6 @@ tags:
|
||||
- topic/construction
|
||||
- type/media/reference
|
||||
title: "Chapter 9: Fire Protection and Life Safety Systems"
|
||||
dg-publish: false
|
||||
---
|
||||
# Chapter 9: Fire Protection and Life Safety Systems
|
||||
|
||||
@@ -9,5 +9,6 @@ tags:
|
||||
- topic/construction
|
||||
- type/media/reference
|
||||
title: "Chapter 10: Means of Egress"
|
||||
dg-publish: false
|
||||
---
|
||||
# Chapter 10: Means of Egress
|
||||
|
||||
@@ -9,6 +9,7 @@ tags:
|
||||
- topic/construction
|
||||
- type/media/reference
|
||||
title: International Building Code
|
||||
dg-publish: false
|
||||
---
|
||||
# International Building Code
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: SECTION 403---HIGH-RISE BUILDINGS
|
||||
dg-publish: false
|
||||
---
|
||||
# SECTION 403---HIGH-RISE BUILDINGS
|
||||
|
||||
|
||||
@@ -9,6 +9,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: SECTION 918---EMERGENCY RESPONDER COMMUNICATION COVERAGE
|
||||
dg-publish: false
|
||||
---
|
||||
# SECTION 918---EMERGENCY RESPONDER COMMUNICATION COVERAGE
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# SECTION 1009---ACCESSIBLE MEANS OF EGRESS
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# SECTION 510---EMERGENCY RESPONDER RADIO COVERAGE
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# SECTION 907---FIRE ALARM AND DETECTION SYSTEMS
|
||||
|
||||
|
||||
@@ -6,10 +6,12 @@ tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/strategy
|
||||
- type/media/book
|
||||
authors:
|
||||
- Daniel Kahneman
|
||||
dg-publish: false
|
||||
---
|
||||
# Thinking, Fast and Slow
|
||||
|
||||
|
||||
@@ -19,6 +19,7 @@ series: Wiley Series in Probability and Statistics
|
||||
subtitle: From Data to Decisions
|
||||
type: book
|
||||
year: 2019
|
||||
dg-publish: false
|
||||
---
|
||||
# Loss Models: From Data to Decisions, Fifth Edition
|
||||
|
||||
|
||||
@@ -19,6 +19,7 @@ publisher: McGraw-Hill, Inc.
|
||||
subtitle: A Personal-Use Shorthand & Integrated Instruction in How to Make Notes
|
||||
type: book
|
||||
year: 1968
|
||||
dg-publish: false
|
||||
---
|
||||
# Gregg Notehand
|
||||
|
||||
|
||||
@@ -13,6 +13,7 @@ authors:
|
||||
- Howard Phillips Lovecraft
|
||||
type: article
|
||||
year: 1937
|
||||
dg-publish: false
|
||||
---
|
||||
# Notes on Writing Weird Fiction
|
||||
|
||||
|
||||
@@ -8,6 +8,7 @@ tags:
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- type/media/article
|
||||
dg-publish: false
|
||||
---
|
||||
# Judgmental Decomposition: When Does It Work?
|
||||
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: Meeting Street Hotel and Residences
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# Meeting Street Hotel and Residences
|
||||
|
||||
@@ -5,6 +5,7 @@ title: My Resoluute Banjo
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/incomplete
|
||||
- topic/hobbies/music/banjo
|
||||
- type/encyclopedia-entry
|
||||
dg-publish: true
|
||||
|
||||
@@ -1,10 +1,12 @@
|
||||
---
|
||||
id:
|
||||
aliases: []
|
||||
title:
|
||||
title: New Carrollton Affordable Multifamily
|
||||
tags:
|
||||
- authorship/original
|
||||
- destiny/permanent
|
||||
- status/not-started
|
||||
- occupational/project
|
||||
---
|
||||
- status/not-started
|
||||
dg-publish: true
|
||||
---
|
||||
# New Carrollton Affordable Multifamily
|
||||
|
||||
@@ -9,6 +9,7 @@ tags:
|
||||
- type/media/reference
|
||||
- exclude-from-word-count
|
||||
title: "NFPA 101: Life Safety Code (2018)"
|
||||
dg-publish: false
|
||||
---
|
||||
# NFPA 101: Life Safety Code (2018)
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 100 Definitions
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 100 Definitions
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 110 Requirements for Electrical Installations
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 110 Requirements for Electrical Installations
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 210 Branch Circuits
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 210 Branch Circuits
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 215 Feeders
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 215 Feeders
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 220 Branch-Circuit, Feeder, and Service Load Calculations
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 220 Branch-Circuit, Feeder, and Service Load Calculations
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 230 Services
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 230 Services
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 240 Overcurrent Protection
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 240 Overcurrent Protection
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 250 Grounding and Bonding
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 250 Grounding and Bonding
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 300 General Requirements for Wiring Methods and Materials
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 300 General Requirements for Wiring Methods and Materials
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 310 Conductors for General Wiring
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 310 Conductors for General Wiring
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 311 Medium Voltage Conductors and Cable
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 311 Medium Voltage Conductors and Cable
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: "Article 320 Armored Cable: Type AC"
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 320 Armored Cable: Type AC
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: "Article 330 Metal-Clad Cable: Type MC"
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 330 Metal-Clad Cable: Type MC
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: "Article 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI"
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: "Article 334 Nonmetallic-Sheathed Cable: Types NM and NMC"
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 334 Nonmetallic-Sheathed Cable: Types NM and NMC
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/draft
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 338 Service-Entrance Cable: Types SE and USE
|
||||
|
||||
|
||||
@@ -0,0 +1,174 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-342
|
||||
title: "Article 342 Intermediate Metal Conduit: Type IMC"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 342 Intermediate Metal Conduit: Type IMC
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 342.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for intermediate metal conduit (IMC) and associated fittings.
|
||||
|
||||
### 342.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Intermediate Metal Conduit (IMC).
|
||||
|
||||
A steel threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings.
|
||||
|
||||
### 342.6 Listing Requirements.
|
||||
|
||||
IMC, factory elbows and couplings, and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 342.10 Uses Permitted.
|
||||
|
||||
#### 342.10(A) All Atmospheric Conditions and Occupancies.
|
||||
|
||||
Use of IMC shall be permitted under all atmospheric conditions and occupancies.
|
||||
|
||||
#### 342.10(B) Corrosion Environments.
|
||||
|
||||
IMC, elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by corrosion protection approved for the condition.
|
||||
|
||||
#### 342.10(C) Cinder Fill.
|
||||
|
||||
IMC shall be permitted to be installed in or under cinder fill where subject to permanent moisture where protected on all sides by a layer of non-cinder concrete not less than 50 mm (2 in.) thick; where the conduit is not less than 450 mm (18 in.) under the fill; or where protected by corrosion protection approved for the condition.
|
||||
|
||||
#### 342.10(D) Wet Locations.
|
||||
|
||||
All supports, bolts, straps, screws, and so forth, shall be of corrosion-resistant materials or protected against corrosion by corrosion-resistant materials.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.6 for protection against corrosion.
|
||||
|
||||
#### 342.10(E) Severe Physical Damage.
|
||||
|
||||
IMC shall be permitted to be installed where subject to severe physical damage.
|
||||
|
||||
### 342.14 Dissimilar Metals.
|
||||
|
||||
Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action.
|
||||
|
||||
Stainless steel and aluminum fittings and enclosures shall be permitted to be used with galvanized steel IMC where not subject to severe corrosive influences.
|
||||
|
||||
Stainless steel IMC shall only be used with the following:
|
||||
|
||||
* (1) Stainless steel fittings
|
||||
|
||||
* (2) Stainless steel boxes and enclosures
|
||||
|
||||
* (3) Steel (galvanized, painted, powder or PVC coated, and so forth) boxes and enclosures when not subject to severe corrosive influences
|
||||
|
||||
* (4) Stainless steel, nonmetallic, or approved accessories
|
||||
|
||||
### 342.20 Size.
|
||||
|
||||
#### 342.20(A) Minimum.
|
||||
|
||||
IMC smaller than metric designator 16 (trade size 1/2) shall not be used.
|
||||
|
||||
#### 342.20(B) Maximum.
|
||||
|
||||
IMC larger than metric designator 103 (trade size 4) shall not be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 342.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
### 342.24 Bends --- How Made.
|
||||
|
||||
Bends of IMC shall be so made that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. The radius of the curve of any field bend to the centerline of the conduit shall not be less than indicated in Table 2, Chapter 9.
|
||||
|
||||
### 342.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 342.28 Reaming and Threading.
|
||||
|
||||
All cut ends shall be reamed or otherwise finished to remove rough edges. Where conduit is threaded in the field, a standard cutting die with a taper of 1 in 16 (3/4 in. taper per foot) shall be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See ANSI/ASME B1.20.1-2013, Standard for Pipe Threads, General Purpose (Inch).
|
||||
|
||||
### 342.30 Securing and Supporting.
|
||||
|
||||
IMC shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 342.30(A) and (B).
|
||||
|
||||
#### 342.30(A) Securely Fastened.
|
||||
|
||||
IMC shall be secured in accordance with one of the following:
|
||||
|
||||
* (1) IMC shall be securely fastened within 900 mm (3 ft) of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination.
|
||||
|
||||
* (2) Where structural members do not readily permit fastening within 900 mm (3 ft), fastening shall be permitted to be increased to a distance of 1.5 m (5 ft).
|
||||
|
||||
* (3) Where approved, conduit shall not be required to be securely fastened within 900 mm (3 ft) of the service head for above-the-roof termination of a mast.
|
||||
|
||||
#### 342.30(B) Supports.
|
||||
|
||||
IMC shall be supported in accordance with one of the following:
|
||||
|
||||
* (1) Conduit shall be supported at intervals not exceeding 3 m (10 ft).
|
||||
|
||||
* (2) The distance between supports for straight runs of conduit shall be permitted in accordance with Table 344.30(B)(2), provided the conduit is made up with threaded couplings and supports that prevent transmission of stresses to termination where conduit is deflected between supports.
|
||||
|
||||
* (3) Exposed vertical risers from industrial machinery or fixed equipment shall be permitted to be supported at intervals not exceeding 6 m (20 ft) if the conduit is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate support is readily available.
|
||||
|
||||
* (4) Horizontal runs of IMC supported by openings through framing members at intervals not exceeding 3 m (10 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted.
|
||||
|
||||
### 342.42 Couplings and Connectors.
|
||||
|
||||
#### 342.42(A) Threadless.
|
||||
|
||||
Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concrete-tight type. Where installed in wet locations, they shall comply with 314.15. Threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose.
|
||||
|
||||
#### 342.42(B) Running Threads.
|
||||
|
||||
Running threads shall not be used on conduit for connection at couplings.
|
||||
|
||||
### 342.46 Bushings.
|
||||
|
||||
Where a conduit enters a box, fitting, or other enclosure, a bushing shall be provided to protect the wires from abrasion unless the box, fitting, or enclosure is designed to provide such protection.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.4(G) for the protection of conductors 4 AWG and larger at bushings.
|
||||
|
||||
### 342.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 342.60 Grounding.
|
||||
|
||||
IMC shall be permitted as an equipment grounding conductor.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 342.100 Construction.
|
||||
|
||||
IMC shall be made of one of the following:
|
||||
|
||||
* (1) Steel, with protective coatings
|
||||
* (2) Stainless steel
|
||||
|
||||
### 342.120 Marking.
|
||||
|
||||
Each length shall be clearly and durably marked at least every 1.5 m (5 ft) with the letters IMC. Each length shall be marked as required in the first sentence of 110.21(A).
|
||||
@@ -0,0 +1,209 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-344
|
||||
title: "Article 344 Rigid Metal Conduit: Type RMC"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 344 Rigid Metal Conduit: Type RMC
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 344.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for rigid metal conduit (RMC) and associated fittings.
|
||||
|
||||
### 344.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Rigid Metal Conduit (RMC).
|
||||
|
||||
A threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings.
|
||||
|
||||
### 344.6 Listing Requirements.
|
||||
|
||||
RMC, factory elbows and couplings, and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 344.10 Uses Permitted.
|
||||
|
||||
#### 344.10(A) Atmospheric Conditions and Occupancies.
|
||||
|
||||
##### 344.10(A)(1) Galvanized Steel, Stainless Steel, and Red Brass RMC.
|
||||
|
||||
Galvanized steel, stainless steel, and red brass RMC shall be permitted under all atmospheric conditions and occupancies.
|
||||
|
||||
##### 344.10(A)(2) Aluminum RMC.
|
||||
|
||||
Aluminum RMC shall be permitted to be installed where approved for the environment. Rigid aluminum conduit encased in concrete or in direct contact with the earth shall be provided with approved supplementary corrosion protection.
|
||||
|
||||
##### 344.10(A)(3) Ferrous Raceways and Fittings.
|
||||
|
||||
Ferrous raceways and fittings protected from corrosion solely by enamel shall be permitted only indoors and in occupancies not subject to severe corrosive influences.
|
||||
|
||||
#### 344.10(B) Corrosive Environments.
|
||||
|
||||
##### 344.10(B)(1) Galvanized Steel, Stainless Steel, and Red Brass RMC, Elbows, Couplings, and Fittings.
|
||||
|
||||
Galvanized steel, stainless steel, and red brass RMC elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by corrosion protection approved for the condition.
|
||||
|
||||
##### 344.10(B)(2) Supplementary Protection of Aluminum RMC.
|
||||
|
||||
Aluminum RMC shall be provided with approved supplementary corrosion protection where encased in concrete or in direct contact with the earth.
|
||||
|
||||
#### 344.10(C) Cinder Fill.
|
||||
|
||||
Galvanized steel, stainless steel, and red brass RMC shall be permitted to be installed in or under cinder fill where subject to permanent moisture where protected on all sides by a layer of noncinder concrete not less than 50 mm (2 in.) thick; where the conduit is not less than 450 mm (18 in.) under the fill; or where protected by corrosion protection approved for the condition.
|
||||
|
||||
#### 344.10(D) Wet Locations.
|
||||
|
||||
All supports, bolts, straps, screws, and so forth, shall be of corrosion-resistant materials or protected against corrosion by corrosionresistant materials.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.6 for protection against corrosion.
|
||||
|
||||
#### 344.10(E) Severe Physical Damage.
|
||||
|
||||
RMC shall be permitted to be installed where subject to severe physical damage.
|
||||
|
||||
### 344.14 Dissimilar Metals.
|
||||
|
||||
Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action.
|
||||
|
||||
Stainless steel and aluminum fittings and enclosures shall be permitted to be used with galvanized steel RMC, and galvanized steel fittings and enclosures shall be permitted to be used with aluminum RMC where not subject to severe corrosive influences. Stainless steel rigid conduit shall only be used with the following:
|
||||
|
||||
* (1) Stainless steel fittings
|
||||
|
||||
* (2) Stainless steel boxes and enclosures
|
||||
|
||||
* (3) Steel (galvanized, painted, powder or PVC coated, and so forth) boxes and enclosures when not subject to severe corrosive influences
|
||||
|
||||
* (4) Stainless steel, nonmetallic, or approved accessories
|
||||
|
||||
### 344.20 Size.
|
||||
|
||||
#### 344.20(A) Minimum.
|
||||
|
||||
RMC smaller than metric designator 16 (trade size 1/2) shall not be used.
|
||||
|
||||
> [!important] Exception:
|
||||
> For enclosing the leads of motors as permitted in 430.245(B).
|
||||
|
||||
#### 344.20(B) Maximum.
|
||||
|
||||
RMC larger than metric designator 155 (trade size 6) shall not be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 344.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
### 344.24 Bends --- How Made.
|
||||
|
||||
Bends of RMC shall be so made that the conduit will not be damaged and so that the internal diameter of the conduit will not be effectively reduced. The radius of the curve of any field bend to the centerline of the conduit shall not be less than indicated in Table 2,
|
||||
|
||||
Chapter 9.
|
||||
|
||||
### 344.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 344.28 Reaming and Threading.
|
||||
|
||||
All cut ends shall be reamed or otherwise finished to remove rough edges. Where conduit is threaded in the field, a standard cutting die with a 1 in 16 taper (3/4 in. taper per foot) shall be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See ANSI/ASME B1.20.1-2013, Standard for Pipe Threads, General Purpose (Inch).
|
||||
|
||||
### 344.30 Securing and Supporting.
|
||||
|
||||
RMC shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 344.30(A) and (B).
|
||||
|
||||
#### 344.30(A) Securely Fastened.
|
||||
|
||||
RMC shall be secured in accordance with one of the following:
|
||||
|
||||
* (1) RMC shall be securely fastened within 900 mm (3 ft) of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination.
|
||||
|
||||
* (2) Fastening shall be permitted to be increased to a distance of 1.5 m (5 ft) where structural members do not readily permit fastening within 900 mm (3 ft).
|
||||
|
||||
* (3) Where approved, conduit shall not be required to be securely fastened within 900 mm (3 ft) of the service head for above-theroof termination of a mast.
|
||||
|
||||
#### 344.30(B) Supports.
|
||||
|
||||
RMC shall be supported in accordance with one of the following:
|
||||
|
||||
* (1) Conduit shall be supported at intervals not exceeding 3 m (10 ft).
|
||||
|
||||
* (2) The distance between supports for straight runs of conduit shall be permitted in accordance with Table 344.30(B)(2), provided the conduit is made up with threaded couplings and supports that prevent transmission of stresses to termination where conduit is deflected between supports.
|
||||
|
||||
* (3) Exposed vertical risers from industrial machinery or fixed equipment shall be permitted to be supported at intervals not exceeding 6 m (20 ft) if the conduit is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate support is readily available.
|
||||
|
||||
* (4) Horizontal runs of RMC supported by openings through framing members at intervals not exceeding 3 m (10 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted.
|
||||
|
||||
Table 344.30(B)(2) Supports for Rigid Metal Conduit
|
||||
|
||||
Conduit Size Maximum Distance Between Rigid Metal Conduit Supports
|
||||
|
||||
Metric Designator Trade Size m ft
|
||||
16--21 1/2--3/4 3.0 10
|
||||
27 1 3.7 12
|
||||
35--41 11/4--11/2 4.3 14
|
||||
53--63 2--21/2 4.9 16
|
||||
78 and larger 3 and larger 6.1 20
|
||||
|
||||
### 344.42 Couplings and Connectors.
|
||||
|
||||
#### 344.42(A) Threadless.
|
||||
|
||||
Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concrete tight type. Where installed in wet locations, they shall comply with 314.15. Threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose.
|
||||
|
||||
#### 344.42(B) Running Threads.
|
||||
|
||||
Running threads shall not be used on conduit for connection at couplings.
|
||||
|
||||
### 344.46 Bushings.
|
||||
|
||||
Where a conduit enters a box, fitting, or other enclosure, a bushing shall be provided to protect the wires from abrasion unless the box, fitting, or enclosure is designed to provide such protection.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.4(G) for the protection of conductors sizes 4 AWG and larger at bushings.
|
||||
|
||||
### 344.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 344.60 Grounding.
|
||||
|
||||
RMC shall be permitted as an equipment grounding conductor.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 344.100 Construction.
|
||||
|
||||
RMC shall be made of one of the following:
|
||||
|
||||
* (1) Steel with protective coatings
|
||||
|
||||
* (2) Aluminum
|
||||
|
||||
* (3) Red brass
|
||||
|
||||
* (4) Stainless steel
|
||||
|
||||
### 344.120 Marking.
|
||||
|
||||
Each length shall be clearly and durably identified in every 3 m (10 ft) as required in the first sentence of 110.21(A). Nonferrous conduit of corrosion-resistant material shall have suitable markings.
|
||||
@@ -0,0 +1,160 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-348
|
||||
title: "Article 348 Flexible Metal Conduit: Type FMC"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 348 Flexible Metal Conduit: Type FMC
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 348.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for flexible metal conduit (FMC) and associated fittings.
|
||||
|
||||
### 348.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Flexible Metal Conduit (FMC).
|
||||
|
||||
A raceway of circular cross section made of helically wound, formed, interlocked metal strip.
|
||||
|
||||
### 348.6 Listing Requirements.
|
||||
|
||||
FMC and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 348.10 Uses Permitted.
|
||||
|
||||
FMC shall be permitted to be used in exposed and concealed locations.
|
||||
|
||||
### 348.12 Uses Not Permitted.
|
||||
|
||||
FMC shall not be used in the following:
|
||||
|
||||
* (1) In wet locations
|
||||
|
||||
* (2) In hoistways, other than as permitted in 620.21(A)(1)
|
||||
|
||||
* (3) In storage battery rooms
|
||||
|
||||
* (4) In any hazardous (classified) location except as permitted by other articles in this Code
|
||||
|
||||
* (5) Where exposed to materials having a deteriorating effect on the installed conductors, such as oil or gasoline
|
||||
|
||||
* (6) Underground or embedded in poured concrete or aggregate
|
||||
|
||||
* (7) Where subject to physical damage
|
||||
|
||||
### 348.20 Size.
|
||||
|
||||
#### 348.20(A) Minimum.
|
||||
|
||||
FMC less than metric designator 16 (trade size 1/2)
|
||||
shall not be used unless permitted in 348.20(A)(1) through (A)(5)
|
||||
for metric designator 12 (trade size 3/8).
|
||||
|
||||
* (1) For enclosing the leads of motors as permitted in 430.245(B)
|
||||
|
||||
* (2) In lengths not in excess of 1.8 m (6 ft) for any of the following uses:
|
||||
* a. For utilization equipment
|
||||
* b. As part of a listed assembly
|
||||
* c. For tap connections to luminaires as permitted in 410.117(C)
|
||||
|
||||
* (3) For manufactured wiring systems as permitted in 604.100(A)
|
||||
|
||||
* (4) In hoistways as permitted in 620.21(A)(1)
|
||||
|
||||
* (5) As part of a listed assembly to connect wired luminaire sections as permitted in 410.137(C)
|
||||
|
||||
#### 348.20(B) Maximum.
|
||||
|
||||
FMC larger than metric designator 103 (trade size 4) shall not be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 348.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9, or as permitted in Table
|
||||
348.22, or for metric designator 12 (trade size 3/8).
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
#### Table 348.22 Maximum Number of Insulated Conductors in Metric Designator 12 (Trade Size 3/8) Flexible Metal Conduit (FMC)
|
||||
|
||||
%% TODO %%
|
||||
|
||||
\*In addition, one insulated, covered, or bare equipment grounding conductor of the same size shall be permitted.
|
||||
|
||||
### 348.24 Bends --- How Made.
|
||||
|
||||
Bends in conduit shall be made so that the conduit is not damaged and the internal diameter of the conduit is not effectively reduced.
|
||||
|
||||
Bends shall be permitted to be made manually without auxiliary equipment. The radius of the curve to the centerline of any bend shall not be less than shown in Table 2, Chapter 9 using the column "Other Bends."
|
||||
|
||||
### 348.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 348.28 Trimming.
|
||||
|
||||
All cut ends shall be trimmed or otherwise finished to remove rough edges, except where fittings that thread into the convolutions are used.
|
||||
|
||||
### 348.30 Securing and Supporting.
|
||||
|
||||
FMC shall be securely fastened in place and supported in accordance with 348.30(A) and (B).
|
||||
|
||||
#### 348.30(A) Securely Fastened.
|
||||
|
||||
FMC shall be securely fastened in place by an approved means within 300 mm (12 in.) of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed 1.4 m (4 1/2 ft). Where used, cable ties shall be listed and be identified for securement and support.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> Where FMC is fished between access points through concealed spaces in finished buildings or structures and supporting is impracticable.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> Where flexibility is necessary after installation, lengths from the last point where the raceway is securely fastened shall not exceed the following:
|
||||
|
||||
* (1) 900 mm (3 ft) for metric designators 16 through 35 (trade sizes 1/2 through 11/4)
|
||||
|
||||
* (2) 1200 mm (4 ft) for metric designators 41 through 53 (trade sizes 11/2 through 2)
|
||||
|
||||
* (3) 1500 mm (5 ft) for metric designators 63 (trade size 21/2) and larger
|
||||
|
||||
> [!important] Exception No. 3:
|
||||
> Lengths not exceeding 1.8 m (6 ft) from a luminaire terminal connection for tap connections to luminaires as permitted in 410.117(C).
|
||||
|
||||
> [!important] Exception No. 4:
|
||||
> Lengths not exceeding 1.8 m (6 ft) from the last point where the raceway is securely fastened for connections within an accessible ceiling to a luminaire(s) or other equipment. For the purposes of this exception, listed flexible metal conduit fittings shall be permitted as a means of securement and support.
|
||||
|
||||
#### 348.30(B) Supports.
|
||||
|
||||
Horizontal runs of FMC supported by openings through framing members at intervals not greater than 1.4 m (4 1/2 ft) and securely fastened within 300 mm (12 in.) of termination points shall be permitted.
|
||||
|
||||
### 348.42 Couplings and Connectors.
|
||||
|
||||
Angle connectors shall not be concealed.
|
||||
|
||||
### 348.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 348.60 Grounding and Bonding.
|
||||
|
||||
If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, an equipment grounding conductor shall be installed.
|
||||
|
||||
Where flexibility is not required after installation, FMC shall be permitted to be used as an equipment grounding conductor when installed in accordance with 250.118(5).
|
||||
|
||||
Where required or installed, equipment grounding conductors shall be installed in accordance with 250.134.
|
||||
|
||||
Where required or installed, equipment bonding jumpers shall be installed in accordance with 250.102.
|
||||
@@ -0,0 +1,152 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-350
|
||||
title: "Article 350 Liquidtight Flexible Metal Conduit: Type LFMC"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 350 Liquidtight Flexible Metal Conduit: Type LFMC
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 350.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for liquidtight flexible metal conduit (LFMC) and associated fittings.
|
||||
|
||||
### 350.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Liquidtight Flexible Metal Conduit (LFMC).
|
||||
|
||||
A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors.
|
||||
|
||||
### 350.6 Listing Requirements.
|
||||
|
||||
LFMC and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 350.10 Uses Permitted.
|
||||
|
||||
LFMC shall be permitted to be used in exposed or concealed locations as follows:
|
||||
|
||||
* (1) Where conditions of installation, operation, or maintenance require flexibility or protection from machine oils, liquids, vapors, or solids.
|
||||
|
||||
* (2) In hazardous (classified) locations where specifically permitted by Chapter 5.
|
||||
|
||||
* (3) For direct burial where listed and marked for the purpose.
|
||||
|
||||
* (4) Conductors or cables rated at a temperature higher than the listed temperature rating of LFMC conduit shall be permitted to be installed in LFMC, provided the conductors or cables are not operated at a temperature higher than the listed temperature rating of the LFMC per 110.14(C).
|
||||
|
||||
### 350.12 Uses Not Permitted.
|
||||
|
||||
LFMC shall not be used where subject to physical damage.
|
||||
|
||||
### 350.20 Size.
|
||||
|
||||
#### 350.20(A) Minimum.
|
||||
|
||||
LFMC smaller than metric designator 16 (trade size 1/2) shall not be used.
|
||||
|
||||
> [!important] Exception:
|
||||
> LFMC of metric designator 12 (trade size 3/8) shall be permitted as covered in 348.20(A).
|
||||
|
||||
#### 350.20(B) Maximum.
|
||||
|
||||
The maximum size of LFMC shall be metric designator 103 (trade size 4).
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 350.22 Number of Conductors or Cables.
|
||||
|
||||
#### 350.22(A) Metric Designators 16 through 103 (Trade Sizes 1/2 through 4).
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
#### 350.22(B) Metric Designator 12 (Trade Size 3/8).
|
||||
|
||||
The number of conductors shall not exceed that permitted in Table 348.22, "Fittings Outside Conduit" columns.
|
||||
|
||||
### 350.24 Bends --- How Made.
|
||||
|
||||
Bends in conduit shall be so made that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. Bends shall be permitted to be made manually without auxiliary equipment. The radius of the curve to the centerline of any bend shall not be less than required in Table 2, Chapter 9 using the column "Other Bends."
|
||||
|
||||
### 350.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 350.28 Trimming.
|
||||
|
||||
All cut ends of conduit shall be trimmed inside and outside to remove rough edges.
|
||||
|
||||
### 350.30 Securing and Supporting.
|
||||
|
||||
LFMC shall be securely fastened in place and supported in accordance with 350.30(A) and (B).
|
||||
|
||||
#### 350.30(A) Securely Fastened.
|
||||
|
||||
LFMC shall be securely fastened in place by an approved means within 300 mm (12 in.) of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed 1.4 m (4 1/2 ft). Where used, cable ties shall be listed and be identified for securement and support.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> Where LFMC is fished between access points through concealed spaces in finished buildings or structures and supporting is impractical.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> Where flexibility is necessary after installation, lengths from the last point where the raceway is securely fastened shall not exceed the following:
|
||||
|
||||
* (1) 900 mm (3 ft) for metric designators 16 through 35 (trade sizes 1/2 through 1 1/4)
|
||||
|
||||
* (2) 1200 mm (4 ft) for metric designators 41 through 53 (trade sizes 1 1/2 through 2)
|
||||
|
||||
* (3) 1500 mm (5 ft) for metric designators 63 (trade size 2 1/2) and larger
|
||||
|
||||
> [!important] Exception No. 3:
|
||||
> Lengths not exceeding 1.8 m (6 ft) from a luminaire terminal connection for tap conductors to luminaires, as permitted in 410.117(C).
|
||||
|
||||
> [!important] Exception No. 4:
|
||||
> Lengths not exceeding 1.8 m (6 ft) from the last point where the raceway is securely fastened for connections within an accessible ceiling to luminaire(s) or other equipment.
|
||||
|
||||
For the purposes of the exceptions, listed LFMC fittings shall be permitted as a means of securement and support.
|
||||
|
||||
#### 350.30(B) Supports.
|
||||
|
||||
Horizontal runs of LFMC supported by openings through framing members at intervals not greater than 1.4 m (4 1/2 ft) and securely fastened within 300 mm (12 in.) of termination points shall be permitted.
|
||||
|
||||
### 350.42 Couplings and Connectors.
|
||||
|
||||
Only fittings listed for use with LFMC shall be used. Angle connectors shall not be concealed. Straight LFMC fittings shall be permitted for direct burial where marked.
|
||||
|
||||
### 350.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 350.60 Grounding and Bonding.
|
||||
|
||||
If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, an equipment grounding conductor shall be installed.
|
||||
|
||||
Where flexibility is not required after installation, LFMC shall be permitted to be used as an equipment grounding conductor when installed in accordance with 250.118(6).
|
||||
|
||||
Where required or installed, equipment grounding conductors shall be installed in accordance with 250.134.
|
||||
|
||||
Where required or installed, equipment bonding jumpers shall be installed in accordance with 250.102.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 501.30(B), 502.30(B), 503.30(B), 505.25(B), and 506.25(B) for types of equipment grounding conductors.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 350.120 Marking.
|
||||
|
||||
LFMC shall be marked according to 110.21.
|
||||
The trade size and other information required by the listing shall also be marked on the conduit.
|
||||
Conduit suitable for direct burial shall be so marked.
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 352 Rigid Polyvinyl Chloride Conduit: Type PVC
|
||||
|
||||
|
||||
@@ -0,0 +1,143 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-353
|
||||
title: "Article 353 High Density Polyethylene Conduit: Type HDPE Conduit"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 353 High Density Polyethylene Conduit: Type HDPE Conduit
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 353.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for high density polyethylene (HDPE) conduit and associated fittings.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> Refer to Article 352 for Rigid Polyvinyl Chloride Conduit: Type PVC and Article 355 for Reinforced Thermosetting Resin Conduit: Type RTRC.
|
||||
|
||||
### 353.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### High Density Polyethylene (HDPE) Conduit.
|
||||
|
||||
A nonmetallic raceway of circular cross section, with associated couplings, connectors, and fittings for the installation of electrical conductors.
|
||||
|
||||
### 353.6 Listing Requirements.
|
||||
|
||||
HDPE conduit and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 353.10 Uses Permitted.
|
||||
|
||||
The use of HDPE conduit shall be permitted under the following conditions:
|
||||
|
||||
* (1) In discrete lengths or in continuous lengths from a reel
|
||||
|
||||
* (2) In locations subject to severe corrosive influences as covered in 300.6 and where subject to chemicals for which the conduit is listed
|
||||
|
||||
* (3) In cinder fill
|
||||
|
||||
* (4) In direct burial installations in earth or concrete
|
||||
|
||||
> [!info] Informational Note to (4):
|
||||
> Refer to 300.5 and 300.50 for underground installations.
|
||||
|
||||
* (5) Above ground, except as prohibited in 353.12, where encased in not less than 50 mm (2 in.) of concrete.
|
||||
|
||||
* (6) Conductors or cables rated at a temperature higher than the listed temperature rating of HDPE conduit shall be permitted to be installed in HDPE conduit, provided the conductors or cables are not operated at a temperature higher than the listed temperature rating of the HDPE conduit.
|
||||
|
||||
### 353.12 Uses Not Permitted.
|
||||
|
||||
HDPE conduit shall not be used under the following conditions:
|
||||
|
||||
* (1) Where exposed
|
||||
|
||||
* (2) Within a building
|
||||
|
||||
* (3) In any hazardous (classified) location, except as permitted by other articles in this Code
|
||||
|
||||
* (4) Where subject to ambient temperatures in excess of 50°C (122°F) unless listed otherwise
|
||||
|
||||
### 353.20 Size.
|
||||
|
||||
#### 353.20(A) Minimum.
|
||||
|
||||
HDPE conduit smaller than metric designator 16 (trade size 1/2) shall not be used.
|
||||
|
||||
#### 353.20(B) Maximum.
|
||||
|
||||
HDPE conduit larger than metric designator 155 (trade size 6) shall not be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> The trade sizes and metric designators are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
See 300.1(C).
|
||||
|
||||
### 353.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
### 353.24 Bends --- How Made.
|
||||
|
||||
Bends shall be so made that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced.
|
||||
|
||||
Bends shall be permitted to be made manually without auxiliary equipment, and the radius of the curve to the centerline of such bends shall not be less than shown in Table 354.24. For conduits of metric designators 129 and 155 (trade sizes 5 and 6) the allowable radii of bends shall be in accordance with specifications provided by the manufacturer.
|
||||
|
||||
### 353.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 353.28 Trimming.
|
||||
|
||||
All cut ends shall be trimmed inside and outside to remove rough edges.
|
||||
|
||||
### 353.46 Bushings.
|
||||
|
||||
Where a conduit enters a box, fitting, or other enclosure, a bushing or adapter shall be provided to protect the wire from abrasion unless the box, fitting, or enclosure design provides equivalent protection.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.4(G) for the protection of conductors 4 AWG and larger at bushings.
|
||||
|
||||
### 353.48 Joints.
|
||||
|
||||
All joints between lengths of conduit, and between conduit and couplings, fittings, and boxes, shall be made by an approved method.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> HDPE conduit can be joined using either heat fusion, electrofusion, or mechanical fittings.
|
||||
|
||||
### 353.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 353.60 Grounding.
|
||||
|
||||
Where equipment grounding is required,
|
||||
a separate equipment grounding conductor shall be installed in the conduit.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> The equipment grounding conductor shall be permitted to be run separately from the conduit where used for grounding dc circuits as permitted in 250.134, Exception No. 2.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> The equipment grounding conductor shall not be required where the grounded conductor is used to ground equipment as permitted in 250.142.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 353.100 Construction.
|
||||
|
||||
HDPE conduit shall be composed of high density polyethylene that is resistant to moisture and chemical atmospheres. The material shall be resistant to moisture and corrosive agents and shall be of sufficient strength to withstand abuse, such as by impact and crushing, in handling and during installation. Where intended for direct burial, without encasement in concrete, the material shall also be capable of withstanding continued loading that is likely to be encountered after installation.
|
||||
|
||||
### 353.120 Marking.
|
||||
|
||||
Each length of HDPE shall be clearly and durably marked at least every 3 m (10 ft) as required in 110.21. The type of material shall also be included in the marking.
|
||||
@@ -0,0 +1,160 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-356
|
||||
title: "Article 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 356.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for liquidtight flexible nonmetallic conduit (LFNC) and associated fittings.
|
||||
|
||||
### 356.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Liquidtight Flexible Nonmetallic Conduit (LFNC).
|
||||
|
||||
A raceway of circular cross section of various types as follows:
|
||||
|
||||
* (1) A smooth seamless inner core and cover bonded together and having one or more reinforcement layers between the core and covers, designated as Type LFNC-A
|
||||
|
||||
* (2) A smooth inner surface with integral reinforcement within the raceway wall, designated as Type LFNC-B
|
||||
|
||||
* (3) A corrugated internal and external surface without integral reinforcement within the raceway wall, designated as Type LFNC-C
|
||||
|
||||
> [!info] Informational Note:
|
||||
> FNMC is an alternative designation for LFNC.
|
||||
|
||||
### 356.6 Listing Requirements.
|
||||
|
||||
LFNC and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 356.10 Uses Permitted.
|
||||
|
||||
LFNC shall be permitted to be used in exposed or concealed locations for the following purposes:
|
||||
|
||||
* (1) Where flexibility is required for installation, operation, or maintenance.
|
||||
|
||||
* (2) Where protection of the contained conductors is required from vapors, machine oils, liquids, or solids.
|
||||
|
||||
* (3) For outdoor locations where listed and marked as suitable for the purpose.
|
||||
|
||||
* (4) For direct burial where listed and marked for the purpose.
|
||||
|
||||
* (5) Type LFNC shall be permitted to be installed in lengths longer than 1.8 m (6 ft) where secured in accordance with 356.30.
|
||||
|
||||
* (6) Type LFNC-B as a listed manufactured prewired assembly, metric designator 16 through 27 (trade size 1/2 through 1) conduit.
|
||||
|
||||
* (7) For encasement in concrete where listed for direct burial and installed in compliance with 356.42.
|
||||
|
||||
* (8) Conductors or cables rated at a temperature rating of LFNC conduit shall be permitted to be installed in LFNC, provided the conductors or cables are not operated at a temperature higher than the listed temperature rating of the LFNC.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> Extreme cold can cause some types of nonmetallic conduits to become brittle and therefore more susceptible to damage from physical contact.
|
||||
|
||||
### 356.12 Uses Not Permitted.
|
||||
|
||||
LFNC shall not be used as follows:
|
||||
|
||||
* (1) Where subject to physical damage
|
||||
|
||||
* (2) Where any combination of ambient and conductor temperatures is in excess of that for which it is listed
|
||||
|
||||
* (3) In lengths longer than 1.8 m (6 ft), except as permitted by 356.10(5) or where a longer length is approved as essential for a required degree of flexibility
|
||||
|
||||
* (4) In any hazardous (classified) location, except as permitted by other articles in this Code
|
||||
|
||||
### 356.20 Size.
|
||||
|
||||
#### 356.20(A) Minimum.
|
||||
|
||||
LFNC smaller than metric designator 16 (trade size 1/2) shall not be used unless permitted in 356.20(A)(1) or (A)(2) for metric designator 12 (trade size 3/8).
|
||||
|
||||
* (1) For enclosing the leads of motors as permitted in 430.245(B)
|
||||
|
||||
* (2) In lengths not exceeding 1.8 m (6 ft) as part of a listed assembly for tap connections to luminaires as required in 410.117(C), or for utilization equipment
|
||||
|
||||
#### 356.20(B) Maximum.
|
||||
|
||||
LFNC larger than metric designator 103 (trade size 4) shall not be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 356.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
### 356.24 Bends --- How Made.
|
||||
|
||||
Bends in conduit shall be so made that the conduit is not damaged and the internal diameter of the conduit is not effectively reduced.
|
||||
|
||||
Bends shall be permitted to be made manually without auxiliary equipment. The radius of the curve to the centerline of any bend shall not be less than shown in Table 2, Chapter 9 using the column "Other Bends."
|
||||
|
||||
### 356.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 356.28 Trimming.
|
||||
|
||||
All cut ends of conduit shall be trimmed inside and outside to remove rough edges.
|
||||
|
||||
### 356.30 Securing and Supporting.
|
||||
|
||||
Type LFNC shall be securely fastened and supported in accordance with one of the following:
|
||||
|
||||
* (1) Where installed in lengths exceeding 1.8 m (6 ft), the conduit shall be securely fastened at intervals not exceeding 900 mm (3 ft) and within 300 mm (12 in.) on each side of every outlet box, junction box, cabinet, or fitting. Where used, cable ties shall be listed for the application and for securing and supporting.
|
||||
|
||||
* (2) Securing or supporting of the conduit shall not be required where it is fished, installed in lengths not exceeding 900 mm (3 ft) at terminals where flexibility is required, or installed in lengths not exceeding 1.8 m (6 ft) from a luminaire terminal connection for tap conductors to luminaires permitted in 410.117(C).
|
||||
|
||||
* (3) Horizontal runs of LFNC supported by openings through framing members at intervals not exceeding 900 mm (3 ft) and securely fastened within 300 mm (12 in.) of termination points shall be permitted.
|
||||
|
||||
* (4) Securing or supporting of LFNC shall not be required where installed in lengths not exceeding 1.8 m (6 ft) from the last point where the raceway is securely fastened for connections within an accessible ceiling to a luminaire(s) or other equipment. For the purpose of 356.30, listed liquidtight flexible nonmetallic conduit fittings shall be permitted as a means of support.
|
||||
|
||||
### 356.42 Couplings and Connectors.
|
||||
|
||||
Only fittings listed for use with LFNC shall be used. Angle connectors shall not be used for concealed raceway installations. Straight
|
||||
|
||||
LFNC fittings are permitted for direct burial or encasement in concrete.
|
||||
|
||||
### 356.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 356.60 Grounding.
|
||||
|
||||
Where equipment grounding is required, a separate equipment grounding conductor shall be installed in the conduit.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> As permitted in 250.134, Exception No. 2, for dc circuits and 250.134, Exception No. 1, for separately run equipment grounding conductors.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> Where the grounded conductor is used to ground equipment as permitted in 250.142.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 356.100 Construction.
|
||||
|
||||
LFNC-B as a prewired manufactured assembly shall be provided in continuous lengths capable of being shipped in a coil, reel, or carton without damage.
|
||||
|
||||
### 356.120 Marking.
|
||||
|
||||
LFNC shall be marked at least every 600 mm (2 ft) in accordance with 110.21. The marking shall include a type designation in accordance with 356.2 and the trade size. Conduit that is intended for outdoor use or direct burial shall be marked.
|
||||
|
||||
The type, size, and quantity of conductors used in prewired manufactured assemblies shall be identified by means of a printed tag or label attached to each end of the manufactured assembly and either the carton, coil, or reel. The enclosed conductors shall be marked in accordance with 310.8.
|
||||
@@ -0,0 +1,195 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-358
|
||||
title: "Article 358 Electrical Metallic Tubing: Type EMT"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 358 Electrical Metallic Tubing: Type EMT
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 358.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications
|
||||
for electrical metallic tubing (EMT) and associated fittings.
|
||||
|
||||
### 358.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Electrical Metallic Tubing (EMT).
|
||||
|
||||
An unthreaded thinwall raceway of circular cross section
|
||||
designed for the physical protection and routing of conductors and cables
|
||||
and for use as an equipment grounding conductor
|
||||
when installed utilizing appropriate fittings.
|
||||
|
||||
### 358.6 Listing Requirements.
|
||||
|
||||
EMT, factory elbows, and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 358.10 Uses Permitted.
|
||||
|
||||
#### 358.10(A) Exposed and Concealed.
|
||||
|
||||
The use of EMT shall be permitted for both exposed and concealed work for the following:
|
||||
|
||||
* (1) In concrete, in direct contact with the earth or in areas subject to severe corrosive influences where installed in accordance with 358.10(B)
|
||||
|
||||
* (2) In dry, damp, and wet locations
|
||||
|
||||
* (3) In any hazardous (classified) location as permitted by other articles in this Code
|
||||
|
||||
#### 358.10(B) Corrosive Environments.
|
||||
|
||||
##### 358.10(B)(1) Galvanized Steel and Stainless Steel EMT, Elbows, and Fittings.
|
||||
|
||||
Galvanized steel and stainless steel EMT, elbows, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by corrosion protection and approved as suitable for the condition.
|
||||
|
||||
##### 358.10(B)(2) Supplementary Protection of Aluminum EMT.
|
||||
|
||||
Aluminum EMT shall be provided with approved supplementary corrosion protection where encased in concrete or in direct contact with the earth.
|
||||
|
||||
#### 358.10(C) Cinder Fill.
|
||||
|
||||
Galvanized steel and stainless steel EMT shall be permitted to be installed in cinder concrete or cinder fill where subject to permanent moisture when protected on all sides by a layer of noncinder concrete at least 50 mm (2 in.) thick or when the tubing is installed at least
|
||||
450 mm (18 in.) under the fill.
|
||||
|
||||
#### 358.10(D) Wet Locations.
|
||||
|
||||
All supports, bolts, straps, screws, and so forth shall be of corrosion-resistant materials or protected against corrosion by corrosionresistant materials.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.6 for protection against corrosion.
|
||||
|
||||
#### 358.10(E) Physical Damage.
|
||||
|
||||
Steel and stainless steel EMT shall be permitted to be installed where subject to physical damage.
|
||||
|
||||
### 358.12 Uses Not Permitted.
|
||||
|
||||
EMT shall not be used under the following conditions:
|
||||
|
||||
* (1) Where subject to severe physical damage
|
||||
|
||||
* (2) For the support of luminaires or other equipment except conduit bodies no larger than the largest trade size of the tubing
|
||||
|
||||
### 358.14 Dissimilar Metals.
|
||||
|
||||
Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action.
|
||||
|
||||
Stainless steel and aluminum fittings and enclosures shall be permitted to be used with galvanized steel EMT, and galvanized steel fittings and enclosures shall be permitted to be used with aluminum EMT where not subject to severe corrosive influences.
|
||||
|
||||
Stainless steel EMT shall only be used with the following:
|
||||
|
||||
* (1) Stainless steel fittings
|
||||
|
||||
* (2) Stainless steel boxes and enclosures
|
||||
|
||||
* (3) Steel (galvanized, painted, powder or PVC coated, and so forth) boxes and enclosures
|
||||
when not subject to severe corrosive influences
|
||||
|
||||
* (4) Stainless steel, nonmetallic, or approved accessories
|
||||
|
||||
### 358.20 Size.
|
||||
|
||||
#### 358.20(A) Minimum.
|
||||
|
||||
EMT smaller than metric designator 16 (trade size 1/2) shall not be used.
|
||||
|
||||
> [!important] Exception:
|
||||
> For enclosing the leads of motors as permitted in 430.245(B).
|
||||
|
||||
#### 358.20(B) Maximum.
|
||||
|
||||
The maximum size of EMT shall be metric designator 103 (trade size 4).
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 358.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
### 358.24 Bends --- How Made.
|
||||
|
||||
Bends shall be made so that the tubing is not damaged and the internal diameter of the tubing is not effectively reduced. The radius of the curve of any field bend to the centerline of the tubing shall not be less than shown in Table 2, Chapter 9 for one-shot and full shoe benders.
|
||||
|
||||
### 358.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 358.28 Reaming and Threading.
|
||||
|
||||
#### 358.28(A) Reaming.
|
||||
|
||||
All cut ends of EMT shall be reamed or otherwise finished to remove rough edges.
|
||||
|
||||
#### 358.28(B) Threading.
|
||||
|
||||
EMT shall not be threaded.
|
||||
|
||||
> [!important] Exception:
|
||||
> EMT with factory threaded integral couplings complying with 358.100.
|
||||
|
||||
### 358.30 Securing and Supporting.
|
||||
|
||||
EMT shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 358.30(A) and (B).
|
||||
|
||||
#### 358.30(A) Securely Fastened.
|
||||
|
||||
EMT shall be securely fastened in place at intervals not to exceed 3 m (10 ft).
|
||||
In addition, each EMT run between termination points
|
||||
shall be securely fastened within 900 mm (3 ft) of each outlet box,
|
||||
junction box, device box, cabinet, conduit body, or other tubing termination.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> Fastening of unbroken lengths shall be permitted to be increased to a distance of 1.5 m (5 ft) where structural members do not readily permit fastening within 900 mm (3 ft).
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> For concealed work in finished buildings or prefinished wall panels where such securing is impracticable, unbroken lengths (without coupling) of EMT shall be permitted to be fished.
|
||||
|
||||
#### 358.30(B) Supports.
|
||||
|
||||
Horizontal runs of EMT supported by openings through framing members at intervals not greater than 3 m (10 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted.
|
||||
|
||||
### 358.42 Couplings and Connectors.
|
||||
|
||||
Couplings and connectors used with EMT shall be made up tight.
|
||||
Where buried in masonry or concrete, they shall be concrete-tight type.
|
||||
Where installed in wet locations, they shall comply with 314.15.
|
||||
|
||||
### 358.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made in accordance with 300.15.
|
||||
|
||||
### 358.60 Grounding.
|
||||
|
||||
EMT shall be permitted as an equipment grounding conductor.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 358.100 Construction.
|
||||
|
||||
EMT shall be made of one of the following:
|
||||
|
||||
* (1) Steel with protective coatings
|
||||
* (2) Aluminum
|
||||
* (3) Stainless steel
|
||||
|
||||
### 358.120 Marking.
|
||||
|
||||
EMT shall be clearly and durably marked at least every 3 m (10 ft)
|
||||
as required in the first sentence of 110.21(A).
|
||||
@@ -0,0 +1,194 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-362
|
||||
title: "Article 362 Electrical Nonmetallic Tubing: Type ENT"
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 362 Electrical Nonmetallic Tubing: Type ENT
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 362.1 Scope.
|
||||
|
||||
This article covers the use, installation, and construction specifications for electrical nonmetallic tubing (ENT) and associated fittings.
|
||||
|
||||
### 362.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Electrical Nonmetallic Tubing (ENT).
|
||||
|
||||
A nonmetallic, pliable, corrugated raceway of circular cross section
|
||||
with integral or associated couplings, connectors, and fittings
|
||||
for the installation of electrical conductors.
|
||||
ENT is composed of a material that is resistant to moisture and chemical atmospheres
|
||||
and is flame retardant.
|
||||
|
||||
A pliable raceway is a raceway that can be bent by hand
|
||||
with a reasonable force but without other assistance.
|
||||
|
||||
### 362.6 Listing Requirements.
|
||||
|
||||
ENT and associated fittings shall be listed.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 362.10 Uses Permitted.
|
||||
|
||||
For the purpose of this article,
|
||||
the first floor of a building shall be that floor that has 50 percent or more
|
||||
of the exterior wall surface area level with or above finished grade.
|
||||
One additional level that is the first level and not designed for human habitation
|
||||
and used only for vehicle parking, storage, or similar use shall be permitted.
|
||||
The use of ENT and fittings shall be permitted in the following:
|
||||
|
||||
* (1) In any building not exceeding three floors above grade as follows:
|
||||
* a. For exposed work, where not prohibited by 362.12
|
||||
* b. Concealed within walls, floors, and ceilings
|
||||
|
||||
* (2) In any building exceeding three floors above grade, ENT shall be concealed within walls, floors, and ceilings where the walls, floors, and ceilings provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies. The 15-minute-finish-rated thermal barrier shall be permitted to be used for combustible or noncombustible walls, floors, and ceilings.
|
||||
|
||||
> [!important] Exception to (2):
|
||||
> Where a fire sprinkler system(s) is installed in accordance with NFPA 13-2016, Standard for the Installation of Sprinkler Systems, on all floors, ENT shall be permitted to be used within walls, floors, and ceilings, exposed or concealed, in buildings exceeding three floors above-grade.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> A finish rating is established for assemblies containing combustible (wood) supports. The finish rating is defined as the time at which the wood stud or wood joist reaches an average temperature rise of 121°C (250°F) or an individual temperature of 163°C (325°F) as measured on the plane of the wood nearest the fire. A finish rating is not intended to represent a rating for a membrane ceiling.
|
||||
|
||||
* (3) In locations subject to severe corrosive influences as covered in 300.6 and where subject to chemicals for which the materials are specifically approved.
|
||||
|
||||
* (4) In concealed, dry, and damp locations not prohibited by 362.12.
|
||||
|
||||
* (5) Above suspended ceilings where the suspended ceilings provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies, except as permitted in 362.10(1)a.
|
||||
|
||||
> [!important] Exception to (5):
|
||||
> ENT shall be permitted to be used above suspended ceilings in buildings exceeding three floors above grade where the building is protected throughout by a fire sprinkler system installed in accordance with NFPA 13-2016, Standard for the Installation of Sprinkler Systems.
|
||||
|
||||
* (6) Encased in poured concrete, or embedded in a concrete slab on grade where ENT is placed on sand or approved screenings, provided fittings identified for this purpose are used for connections.
|
||||
|
||||
* (7) For wet locations indoors as permitted in this section or in a concrete slab on or below-grade, with fittings listed for the purpose.
|
||||
|
||||
* (8) Metric designator 16 through 27 (trade size 1/2 through 1) as listed manufactured prewired assembly.
|
||||
|
||||
* (9) Conductors or cables rated at a temperature higher than the listed temperature rating of ENT shall be permitted to be installed in ENT, if the conductors or cables are not operated at a temperature higher than the listed temperature rating of the ENT.
|
||||
|
||||
### 362.12 Uses Not Permitted.
|
||||
|
||||
ENT shall not be used in the following:
|
||||
|
||||
* (1) In any hazardous (classified) location, except as permitted by other articles in this Code
|
||||
|
||||
* (2) For the support of luminaires and other equipment
|
||||
|
||||
* (3) Where subject to ambient temperatures in excess of 50°C (122°F) unless listed otherwise
|
||||
|
||||
* (4) For direct earth burial
|
||||
|
||||
* (5) In exposed locations, except as permitted by 362.10(1), 362.10(5), and 362.10(7)
|
||||
|
||||
* (6) In theaters and similar locations, except as provided in 518.4 and 520.5
|
||||
|
||||
* (7) Where exposed to the direct rays of the sun, unless identified as sunlight resistant
|
||||
|
||||
* (8) Where subject to physical damage
|
||||
|
||||
> [!info] Informational Note:
|
||||
> Extreme cold may cause some types of nonmetallic conduits to become brittle and therefore more susceptible to damage from physical contact.
|
||||
|
||||
### 362.20 Size.
|
||||
|
||||
#### 362.20(A) Minimum.
|
||||
|
||||
ENT smaller than metric designator 16 (trade size 1/2) shall not be used.
|
||||
|
||||
#### 362.20(B) Maximum.
|
||||
|
||||
ENT larger than metric designator 63 (trade size 21/2) shall not be used.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions.
|
||||
|
||||
### 362.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall not exceed that permitted by the percentage fill in Table 1, Chapter 9.
|
||||
|
||||
Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9.
|
||||
|
||||
### 362.24 Bends --- How Made.
|
||||
|
||||
Bends shall be so made that the tubing will not be damaged and the internal diameter of the tubing will not be effectively reduced.
|
||||
|
||||
Bends shall be permitted to be made manually without auxiliary equipment, and the radius of the curve to the centerline of such bends shall not be less than shown in Table 2, Chapter 9 using the column "Other Bends."
|
||||
|
||||
### 362.26 Bends --- Number in One Run.
|
||||
|
||||
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
|
||||
|
||||
### 362.28 Trimming.
|
||||
|
||||
All cut ends shall be trimmed inside and outside to remove rough edges.
|
||||
|
||||
### 362.30 Securing and Supporting.
|
||||
|
||||
ENT shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place by an approved means and supported in accordance with 362.30(A) and (B).
|
||||
|
||||
#### 362.30(A) Securely Fastened.
|
||||
|
||||
ENT shall be securely fastened at intervals not exceeding 900 mm (3 ft). In addition, ENT shall be securely fastened in place within 900 mm (3 ft) of each outlet box, device box, junction box, cabinet, or fitting where it terminates. Where used, cable ties shall be listed for the application and for securing and supporting.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> Lengths not exceeding a distance of 1.8 m (6 ft) from a luminaire terminal connection for tap connections to lighting luminaires shall be permitted without being secured.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> Lengths not exceeding 1.8 m (6 ft) from the last point where the raceway is securely fastened for connections within an accessible ceiling to luminaire(s) or other equipment.
|
||||
|
||||
> [!important] Exception No. 3:
|
||||
> For concealed work in finished buildings or prefinished wall panels where such securing is impracticable, unbroken lengths (without coupling) of ENT shall be permitted to be fished.
|
||||
|
||||
#### 362.30(B) Supports.
|
||||
|
||||
Horizontal runs of ENT supported by openings in framing members at intervals not exceeding 900 mm (3 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted.
|
||||
|
||||
### 362.46 Bushings.
|
||||
|
||||
Where a tubing enters a box, fitting, or other enclosure, a bushing or adapter shall be provided to protect the wire from abrasion unless the box, fitting, or enclosure design provides equivalent protection.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.4(G) for the protection of conductors size 4 AWG or larger.
|
||||
|
||||
### 362.48 Joints.
|
||||
|
||||
All joints between lengths of tubing and between tubing and couplings, fittings, and boxes shall be by an approved method.
|
||||
|
||||
### 362.56 Splices and Taps.
|
||||
|
||||
Splices and taps shall be made only in accordance with 300.15.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See Article 314 for rules on the installation and use of boxes and conduit bodies.
|
||||
|
||||
### 362.60 Grounding.
|
||||
|
||||
Where equipment grounding is required, a separate equipment grounding conductor shall be installed in the raceway in compliance with Article 250, Part VI.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 362.100 Construction.
|
||||
|
||||
ENT shall be made of material that does not exceed the ignitibility, flammability, smoke generation, and toxicity characteristics of rigid
|
||||
(nonplasticized) polyvinyl chloride.
|
||||
|
||||
ENT, as a prewired manufactured assembly, shall be provided in continuous lengths capable of being shipped in a coil, reel, or carton without damage.
|
||||
|
||||
### 362.120 Marking.
|
||||
|
||||
ENT shall be clearly and durably marked at least every 3 m (10 ft) as required in the first sentence of 110.21(A). The type of material shall also be included in the marking. Marking for limited smoke shall be permitted on the tubing that has limited smoke-producing characteristics.
|
||||
|
||||
The type, size, and quantity of conductors used in prewired manufactured assemblies shall be identified by means of a printed tag or label attached to each end of the manufactured assembly and either the carton, coil, or reel. The enclosed conductors shall be marked in accordance with 310.8.
|
||||
@@ -0,0 +1,293 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-368
|
||||
title: Article 368 Busways
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 368 Busways
|
||||
|
||||
## Part I. General Requirements
|
||||
|
||||
### 368.1 Scope.
|
||||
|
||||
This article covers service-entrance, feeder, and branch-circuit busways and associated fittings.
|
||||
|
||||
### 368.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Busway.
|
||||
|
||||
A raceway consisting of a metal enclosure containing factory-mounted, bare or insulated conductors, which are usually copper or aluminum bars, rods, or tubes.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> For cablebus, refer to Article 370.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 368.10 Uses Permitted.
|
||||
|
||||
Busways shall be permitted to be installed where they are located in accordance with 368.10(A) through (C).
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.21 for information concerning the spread of fire or products of combustion.
|
||||
|
||||
#### 368.10(A) Exposed.
|
||||
|
||||
Busways shall be permitted to be located in the open where visible, except as permitted in 368.10(C).
|
||||
|
||||
#### 368.10(B) Behind Access Panels.
|
||||
|
||||
Busways shall be permitted to be installed behind access panels, provided the busways are totally enclosed, of nonventilating-type construction, and installed so that the joints between sections and at fittings are accessible for maintenance purposes. Where installed behind access panels, means of access shall be provided, and either of the following conditions shall be met:
|
||||
|
||||
* (1) The space behind the access panels shall not be used for air-handling purposes.
|
||||
|
||||
* (2) Where the space behind the access panels is used for environmental air, other than ducts and plenums, there shall be no provisions for plug-in connections, and the conductors shall be insulated.
|
||||
|
||||
#### 368.10(C) Through Walls and Floors.
|
||||
|
||||
Busways shall be permitted to be installed through walls or floors in accordance with (C)(1) and (C)(2).
|
||||
|
||||
##### 368.10(C)(1) Walls.
|
||||
|
||||
Unbroken lengths of busway shall be permitted to be extended through dry walls.
|
||||
|
||||
##### 368.10(C)(2) Floors.
|
||||
|
||||
Floor penetrations shall comply with (a) and (b):
|
||||
|
||||
* (a) Busways shall be permitted to be extended vertically through dry floors if totally enclosed (unventilated) where passing through and for a minimum distance of 1.8 m (6 ft) above the floor to provide adequate protection from physical damage.
|
||||
|
||||
* (b) In other than industrial establishments, where a vertical riser penetrates two or more dry floors, a minimum 100-mm (4-in.) high curb shall be installed around all floor openings for riser busways to prevent liquids from entering the opening. The curb shall be installed within 300 mm (12 in.) of the floor opening. Electrical equipment shall be located so that it will not be damaged by liquids that are retained by the curb.
|
||||
|
||||
### 368.12 Uses Not Permitted.
|
||||
|
||||
#### 368.12(A) Physical Damage.
|
||||
|
||||
Busways shall not be installed where subject to severe physical damage or corrosive vapors.
|
||||
|
||||
#### 368.12(B) Hoistways.
|
||||
|
||||
Busways shall not be installed in hoistways.
|
||||
|
||||
#### 368.12(C) Hazardous Locations.
|
||||
|
||||
Busways shall not be installed in any hazardous (classified) location, unless specifically approved for such use.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 501.10(B).
|
||||
|
||||
#### 368.12(D) Wet Locations.
|
||||
|
||||
Busways shall not be installed outdoors or in wet or damp locations unless identified for such use.
|
||||
|
||||
#### 368.12(E) Working Platform.
|
||||
|
||||
Lighting busway and trolley busway shall not be installed less than 2.5 m (8 ft) above the floor or working platform unless provided with an identified cover.
|
||||
|
||||
### 368.17 Overcurrent Protection.
|
||||
|
||||
Overcurrent protection shall be provided in accordance with 368.17(A) through (D).
|
||||
|
||||
#### 368.17(A) Rating of Overcurrent Protection --- Feeders.
|
||||
|
||||
A busway shall be protected against overcurrent in accordance with the current rating of the busway.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> The applicable provisions of 240.4 shall be permitted.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> Where used as transformer secondary ties, 450.6(A) (3) shall be permitted.
|
||||
|
||||
#### 368.17(B) Reduction in Ampacity Size of Busway.
|
||||
|
||||
Overcurrent protection shall be required where busways are reduced in ampacity.
|
||||
|
||||
> [!important] Exception:
|
||||
> For industrial establishments only, omission of overcurrent protection shall be permitted at points where busways are reduced in ampacity, provided that the length of the busway having the smaller ampacity does not exceed 15 m (50 ft) and has an ampacity at least equal to one-third the rating or setting of the overcurrent device next back on the line, and provided that such busway is free from contact with combustible material.
|
||||
|
||||
#### 368.17(C) Feeder or Branch Circuits.
|
||||
|
||||
Where a busway is used as a feeder, devices or plug-in connections for tapping off feeder or branch circuits from the busway shall contain the overcurrent devices required for the protection of the feeder or branch circuits. The plug-in device shall consist of an externally operable circuit breaker or an externally operable fusible switch. Where such devices are mounted out of reach and contain disconnecting means, suitable means such as ropes, chains, or sticks shall be provided for operating the disconnecting means from the floor.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> As permitted in 240.21.
|
||||
|
||||
> [!important] Exception No. 2:
|
||||
> For fixed or semifixed luminaires, where the branch-circuit overcurrent device is part of the luminaire cord plug on cord-connected luminaires.
|
||||
|
||||
> [!important] Exception No. 3:
|
||||
> Where luminaires without cords are plugged directly into the busway and the overcurrent device is mounted on the luminaire.
|
||||
|
||||
> [!important] Exception No. 4:
|
||||
> Where the branch-circuit overcurrent plug-in device is directly supplying a readily accessible disconnect, a method of floor operation shall not be required.
|
||||
|
||||
#### 368.17(D) Rating of Overcurrent Protection --- Branch Circuits.
|
||||
|
||||
A busway used as a branch circuit shall be protected against overcurrent in accordance with 210.20.
|
||||
|
||||
### 368.30 Support.
|
||||
|
||||
Busways shall be securely supported at intervals not exceeding 1.5 m (5 ft) unless otherwise designed and marked.
|
||||
|
||||
### 368.56 Branches from Busways.
|
||||
|
||||
Branches from busways shall be permitted to be made in accordance with 368.56(A), (B), and (C).
|
||||
|
||||
#### 368.56(A) General.
|
||||
|
||||
Branches from busways shall be permitted to use any of the following wiring methods:
|
||||
|
||||
* (1) Type AC armored cable
|
||||
|
||||
* (2) Type MC metal-clad cable
|
||||
|
||||
* (3) Type MI mineral-insulated, metal-sheathed cable
|
||||
|
||||
* (4) Type IMC intermediate metal conduit
|
||||
|
||||
* (5) Type RMC rigid metal conduit
|
||||
|
||||
* (6) Type FMC flexible metal conduit
|
||||
|
||||
* (7) Type LFMC liquidtight flexible metal conduit
|
||||
|
||||
* (8) Type PVC rigid polyvinyl chloride conduit
|
||||
|
||||
* (9) Type RTRC reinforced thermosetting resin conduit
|
||||
|
||||
* (10) Type LFNC liquidtight flexible nonmetallic conduit
|
||||
|
||||
* (11) Type EMT electrical metallic tubing
|
||||
|
||||
* (12) Type ENT electrical nonmetallic tubing
|
||||
|
||||
* (13) Busways
|
||||
|
||||
* (14) Strut-type channel raceway
|
||||
|
||||
* (15) Surface metal raceway
|
||||
|
||||
* (16) Surface nonmetallic raceway
|
||||
|
||||
Where a separate equipment grounding conductor is used, connection of the equipment grounding conductor to the busway shall comply with 250.8 and 250.12.
|
||||
|
||||
#### 368.56(B) Cord and Cable Assemblies.
|
||||
|
||||
Suitable cord and cable assemblies identified for extra-hard usage or hard usage and listed bus drop cable shall be permitted as branches from busways for the connection of portable equipment or the connection of stationary equipment to facilitate their interchange in accordance with 400.10 and 400.12 and the following conditions:
|
||||
|
||||
* (1) The cord or cable shall be attached to the building by an approved means.
|
||||
|
||||
* (2) The length of the cord or cable from a busway plug-in device to a suitable tension take-up support device shall not exceed 1.8 m
|
||||
(6 ft).
|
||||
|
||||
* (3) The cord and cable shall be installed as a vertical riser from the tension take-up support device to the equipment served.
|
||||
|
||||
* (4) Strain relief cable grips shall be provided for the cord or cable at the busway plug-in device and equipment terminations.
|
||||
|
||||
Exception to (B)(2): In industrial establishments only, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, lengths exceeding 1.8 m (6 ft) shall be permitted between the busway plug-in device and the tension take-up support device where the cord or cable is supported at intervals not exceeding 2.5 m (8 ft).
|
||||
|
||||
#### 368.56(C) Branches from Trolley-Type Busways.
|
||||
|
||||
Suitable cord and cable assemblies identified for extra-hard usage or hard usage and listed bus drop cable shall be permitted as branches from trolley-type busways for the connection of movable equipment in accordance with 400.10 and 400.12.
|
||||
|
||||
### 368.58 Dead Ends.
|
||||
|
||||
A dead end of a busway shall be closed.
|
||||
|
||||
### 368.60 Grounding.
|
||||
|
||||
Busway shall be connected to an equipment grounding conductor(s), to an equipment bonding jumper, or to the grounded conductor where permitted or required by 250.92(B)(1) or 250.142.
|
||||
|
||||
## Part III. Construction
|
||||
|
||||
### 368.120 Marking.
|
||||
|
||||
Busways shall be marked with the voltage and current rating for which they are designed, and with the manufacturer's name or trademark in such a manner as to be visible after installation.
|
||||
|
||||
## Part IV. Requirements for Over 1000 Volts, Nominal
|
||||
|
||||
### 368.214 Adjacent and Supporting Structures.
|
||||
|
||||
Metal-enclosed busways shall be installed so that temperature rise from induced circulating currents in adjacent ferrous metal parts will not be hazardous to personnel or constitute a fire hazard.
|
||||
|
||||
### 368.234 Barriers and Seals.
|
||||
|
||||
#### 368.234(A) Vapor Seals.
|
||||
|
||||
Busway runs that have sections located both inside and outside of buildings shall have a vapor seal at the building wall to prevent interchange of air between indoor and outdoor sections.
|
||||
|
||||
> [!important] Exception:
|
||||
> Vapor seals shall not be required in forced-cooled bus.
|
||||
|
||||
#### 368.234(B) Fire Barriers.
|
||||
|
||||
Fire barriers shall be provided where fire walls, floors, or ceilings are penetrated.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See 300.21 for information concerning the spread of fire or products of combustion.
|
||||
|
||||
### 368.236 Drain Facilities.
|
||||
|
||||
Drain plugs, filter drains, or similar methods shall be provided to remove condensed moisture from low points in busway run.
|
||||
|
||||
### 368.237 Ventilated Bus Enclosures.
|
||||
|
||||
Ventilated busway enclosures shall be installed in accordance with Article 110, Part III, and 490.24.
|
||||
|
||||
### 368.238 Terminations and Connections.
|
||||
|
||||
Where bus enclosures terminate at machines cooled by flammable gas, seal-off bushings, baffles, or other means shall be provided to prevent accumulation of flammable gas in the busway enclosures.
|
||||
|
||||
All conductor termination and connection hardware shall be accessible for installation, connection, and maintenance.
|
||||
|
||||
### 368.239 Switches.
|
||||
|
||||
Switching devices or disconnecting links provided in the busway run shall have the same momentary rating as the busway.
|
||||
|
||||
Disconnecting links shall be plainly marked to be removable only when bus is de-energized. Switching devices that are not load-break shall be interlocked to prevent operation under load, and disconnecting link enclosures shall be interlocked to prevent access to energized parts.
|
||||
|
||||
### 368.240 Wiring 1000 Volts or Less, Nominal.
|
||||
|
||||
Secondary control devices and wiring that are provided as part of the metal-enclosed bus run shall be insulated by fire-retardant barriers from all primary circuit elements with the exception of short lengths of wire, such as at instrument transformer terminals.
|
||||
|
||||
### 368.244 Expansion Fittings.
|
||||
|
||||
Flexible or expansion connections shall be provided in long, straight runs of bus to allow for temperature expansion or contraction, or where the busway run crosses building vibration insulation joints.
|
||||
|
||||
### 368.258 Neutral Conductor.
|
||||
|
||||
Neutral bus, where required, shall be sized to carry all neutral load current, including harmonic currents, and shall have adequate momentary and short-circuit current rating consistent with system requirements.
|
||||
|
||||
### 368.260 Grounding.
|
||||
|
||||
Metal-enclosed busway shall be grounded.
|
||||
|
||||
### 368.320 Marking.
|
||||
|
||||
Each busway run shall be provided with a permanent nameplate on which the following information shall be provided:
|
||||
|
||||
* (1) Rated voltage.
|
||||
|
||||
* (2) Rated continuous current; if bus is forced-cooled, both the normal forced-cooled rating and the self-cooled (not forced-cooled) rating for the same temperature rise shall be given.
|
||||
|
||||
* (3) Rated frequency.
|
||||
|
||||
* (4) Rated impulse withstand voltage.
|
||||
|
||||
* (5) Rated 60-Hz withstand voltage (dry).
|
||||
|
||||
* (6) Rated momentary current.
|
||||
|
||||
* (7) Manufacturer's name or trademark.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> See IEEE C37.23-2015, IEEE Standard for Metal-Enclosed Bus, for construction and testing requirements for metal-enclosed bus assemblies.
|
||||
@@ -0,0 +1,145 @@
|
||||
---
|
||||
id:
|
||||
aliases:
|
||||
- nec-370
|
||||
title: Article 370 Cablebus
|
||||
tags:
|
||||
- authorship/other
|
||||
- destiny/permanent
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 370 Cablebus
|
||||
|
||||
## Part I. General
|
||||
|
||||
### 370.1 Scope.
|
||||
|
||||
This article covers the use and installation requirements of cablebus and associated fittings.
|
||||
|
||||
### 370.2 Definition.
|
||||
|
||||
The definition in this section shall apply within this article and throughout the Code.
|
||||
|
||||
#### Cablebus.
|
||||
|
||||
An assembly of units or sections with insulated conductors having associated fittings forming a structural system used to securely fasten or support conductors and conductor terminations in a completely enclosed, ventilated, protective metal housing. This assembly is designed to carry fault current and to withstand the magnetic forces of such current.
|
||||
|
||||
> [!info] Informational Note:
|
||||
> Cablebus is ordinarily assembled at the point of installation from the components furnished or specified by the manufacturer in accordance with instructions for the specific job.
|
||||
|
||||
## Part II. Installation
|
||||
|
||||
### 370.10 Uses Permitted.
|
||||
|
||||
Approved cablebus shall be permitted:
|
||||
|
||||
* (1) At any voltage or current for which spaced conductors are rated and where installed only for exposed work, except as permitted in 370.18
|
||||
|
||||
* (2) For branch circuits, feeders, and services
|
||||
|
||||
* (3) To be installed outdoors or in corrosive, wet, or damp locations where identified for the use
|
||||
|
||||
### 370.12 Uses Not Permitted.
|
||||
|
||||
Cablebus shall not be permitted to be installed in the following:
|
||||
|
||||
* (1) Hoistways
|
||||
|
||||
* (2) Hazardous (classified) locations, unless specifically permitted in Chapter 5
|
||||
|
||||
### 370.18 Cablebus Installation.
|
||||
|
||||
#### 370.18(A) Transversely Routed.
|
||||
|
||||
Cablebus shall be permitted to extend transversely through partitions or walls, other than fire walls, provided that the section within the wall is continuous, protected against physical damage, and unventilated.
|
||||
|
||||
#### 370.18(B) Through Dry Floors and Platforms.
|
||||
|
||||
Except where firestops are required, cablebus shall be permitted to extend vertically through dry floors and platforms, provided that the cablebus is totally enclosed at the point where it passes through the floor or platform and for a distance of 1.8 m (6 ft) above the floor or platform.
|
||||
|
||||
#### 370.18(C) Through Floors and Platforms in Wet Locations.
|
||||
|
||||
Except where firestops are required, cablebus shall be permitted to extend vertically through floors and platforms in wet locations where:
|
||||
|
||||
* (1) There are curbs or other suitable means to prevent waterflow through the floor or platform opening, and
|
||||
|
||||
* (2) Where the cablebus is totally enclosed at the point where it passes through the floor or platform and for a distance of 1.8 m (6 ft) above the floor or platform.
|
||||
|
||||
### 370.20 Conductor Size and Termination.
|
||||
|
||||
#### 370.20(A) Conductors.
|
||||
|
||||
The current-carrying conductors in cablebus shall:
|
||||
|
||||
* (1) Have an insulation rating of 75°C (167°F) or higher and be of an approved type suitable for the application.
|
||||
|
||||
* (2) Be sized in accordance with the design of the cablebus but in no case be smaller than 1/0.
|
||||
|
||||
#### 370.20(B) Termination.
|
||||
|
||||
Approved terminating means shall be used for connections to cablebus conductors.
|
||||
|
||||
> [!info] Informational Note No. 1:
|
||||
> See 110.14(C) for conductor temperature limitations due to termination provisions for installations up to and including 2000 volts.
|
||||
|
||||
> [!info] Informational Note No. 2:
|
||||
> See 110.40 for conductor temperature limitations due to termination provisions for installations 2001 volts to
|
||||
35,000 volts.
|
||||
|
||||
### 370.22 Number of Conductors.
|
||||
|
||||
The number of conductors shall be that for which the cablebus is designed.
|
||||
|
||||
### 370.23 Overcurrent Protection.
|
||||
|
||||
Cablebus shall be protected against overcurrent in accordance with the ampacity of the cablebus conductors in accordance with 240.4.
|
||||
|
||||
> [!important] Exception:
|
||||
> Overcurrent protection shall be permitted in accordance with 240.100 and 240.101.
|
||||
|
||||
### 370.30 Securing and Supporting.
|
||||
|
||||
#### 370.30(A) Cablebus Supports.
|
||||
|
||||
Cablebus shall be securely supported at intervals not exceeding 3.7 m (12 ft). Where spans longer than 3.7 m (12 ft) are required, the structure shall be specifically designed for the required span length.
|
||||
|
||||
#### 370.30(B) Conductor Supports.
|
||||
|
||||
The insulated conductors shall be supported on blocks or other identified mounting means.
|
||||
|
||||
The individual conductors in a cablebus shall be supported at intervals not greater than 900 mm (3 ft) for horizontal runs and 450 mm
|
||||
(1 1/2 ft) for vertical runs. Vertical and horizontal spacing between supported conductors shall be not less than one conductor diameter at the points of support.
|
||||
|
||||
### 370.42 Fittings.
|
||||
|
||||
A cablebus system shall include approved fittings for the following:
|
||||
|
||||
* (1) Changes in horizontal or vertical direction of the run
|
||||
|
||||
* (2) Dead ends
|
||||
|
||||
* (3) Terminations in or on connected apparatus or equipment or the enclosures for such equipment
|
||||
|
||||
* (4) Additional physical protection where required, such as guards where subject to severe physical damage
|
||||
|
||||
### 370.60 Grounding.
|
||||
|
||||
A cablebus system shall be grounded and/or bonded as applicable:
|
||||
|
||||
* (1) Cablebus framework, where bonded, shall be permitted to be used as the equipment grounding conductor for branch circuits and feeders.
|
||||
|
||||
* (2) A cablebus installation shall be grounded and bonded in accordance with Article 250, excluding 250.86, Exception No. 2.
|
||||
|
||||
### 370.80 Ampacity of Conductors.
|
||||
|
||||
The ampacity of conductors in cablebus shall be in accordance with 310.17 and 310.19 for installations up to and including 2000 volts, or with Table 311.60(C)(69) and Table 311.60(C)(70) for installations 2001 volts to 35,000 volts.
|
||||
|
||||
## Part III. Construction Specifications
|
||||
|
||||
### 370.120 Marking.
|
||||
|
||||
Each section of cablebus shall be marked with the manufacturer's name or trade designation and the maximum diameter, number, voltage rating, and ampacity of the conductors to be installed. Markings shall be located so as to be visible after installation.
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 392 Cable Trays
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps)
|
||||
|
||||
|
||||
@@ -10,5 +10,6 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 422 Appliances
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 422 Appliances
|
||||
|
||||
@@ -10,5 +10,6 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 424 Fixed Electric Space-Heating Equipment
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 424 Fixed Electric Space-Heating Equipment
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 430 Motors, Motor Circuits, and Controllers
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 430 Motors, Motor Circuits, and Controllers
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 440 Air-Conditioning and Refrigerating Equipment
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 440 Air-Conditioning and Refrigerating Equipment
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/draft
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 518 Assembly Occupancies
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/draft
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 590 Temporary Installations
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 695 Fire Pumps
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 700 Emergency Systems
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 700 Emergency Systems
|
||||
|
||||
|
||||
@@ -10,6 +10,7 @@ tags:
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
title: Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
|
||||
dg-publish: false
|
||||
---
|
||||
# Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
|
||||
|
||||
|
||||
+24
-1
@@ -10,9 +10,32 @@ tags:
|
||||
- status/incomplete
|
||||
- topic/construction/electrical
|
||||
- type/media/reference
|
||||
dg-publish: false
|
||||
---
|
||||
# Chapter 9 Tables
|
||||
|
||||
## Notes to Tables
|
||||
|
||||
* **9.0(1)** See Informative Annex C for the maximum number of conductors and fixture wires, all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing.
|
||||
|
||||
* **9.0(2)** Table 1 applies only to complete conduit or tubing systems and is not intended to apply to sections of conduit or tubing used to protect exposed wiring and cable from physical damage.
|
||||
|
||||
* **9.0(3)** Equipment grounding or bonding conductors, where installed, shall be included when calculating conduit or tubing fill. The actual dimensions of the equipment grounding or bonding conductor (insulated or bare) shall be used in the calculation.
|
||||
|
||||
* **9.0(4)** Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(C)(1) adjustment factors need not apply to this condition.
|
||||
|
||||
* **9.0(5)** For conductors not included in Chapter 9, such as multiconductor cables and optical fiber cables, the actual dimensions shall be used.
|
||||
|
||||
* **9.0(6)** For combinations of conductors of different sizes, use actual dimensions or Table 5 and Table 5A for dimensions of conductors and Table 4 for the applicable conduit or tubing dimensions.
|
||||
|
||||
* **9.0(7)** When calculating the maximum number of conductors or cables permitted in a conduit or tubing, all of the same size (total cross-sectional area including insulation), the next higher whole number shall be used to determine the maximum number of conductors permitted when the calculation results in a decimal greater than or equal to 0.8. When calculating the size for conduit or tubing permitted for a single conductor, one conductor shall be permitted when the calculation results in a decimal greater than or equal to 0.8.
|
||||
|
||||
* **9.0(8)** Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 shall be permitted.
|
||||
|
||||
* **9.0(9)** A multiconductor cable, optical fiber cable, or flexible cord of two or more conductors shall be treated as a single conductor for calculating percentage conduit or tubing fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter. Assemblies of single insulated conductors without an overall covering shall not be considered a cable when determining conduit or tubing fill area. The conduit or tubing fill for the assemblies shall be calculated based upon the individual conductors.
|
||||
|
||||
* **9.0(10)** The values for approximate conductor diameter and area shown in Table 5 are based on worst-case scenario and indicate round concentric-lay-stranded conductors. Solid and round concentric-lay-stranded conductor values are grouped together for the purpose of Table 5. Round compact-stranded conductor values are shown in Table 5A. If the actual values of the conductor diameter and area are known, they shall be permitted to be used.
|
||||
|
||||
## Table 1 Percent of Cross Section of Conduit and Tubing for Conductors and Cables
|
||||
|
||||
| Number of Conductors and/or Cables | Cross-Sectional Area (%) |
|
||||
@@ -33,4 +56,4 @@ tags:
|
||||
> to the conductor or cable (outside diameter)
|
||||
> is between 2.8 and 3.2, jamming can occur.
|
||||
> While jamming can occur when pulling four or more conductors or cables into a raceway,
|
||||
> the probability is very low.
|
||||
> the probability is very low.
|
||||
+4
-1743
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Reference in New Issue
Block a user