---
id:
aliases: []
tags:
  - destiny/permanent
  - occupational/takeoff/subfeeds
  - status/draft
  - type/guide
  - authorship/original
title: Subfeeds
---
# Subfeeds

## Unit Load Center Subfeeds

Route from meter center to unit load center,
using adders appropriate for the difference in elevation.
Use an additional 10ft for makeup when using cable.

> [!tip]
> Identify if and where typicals can be used

## Multi-Circuit Homerun Subfeeds

Typical of hotels and dormitories.

Route from panel to center of the room,
using adders appropriate for the difference in elevation.

If voltage drop is to be considered in takeoff,
Use the table provided in the drawings.
If no table is provided, use the following:

| Wire Size | Max Length |
| --------: | ---------: |
|       #12 |      100ft |
|       #10 |      200ft |
|        #8 |     >200ft |

#### Pigtail Adaptors

[[distribution-equipment#Pigtail Adaptors|Pigtail Adaptors]]

Use where conductors are oversized for voltage drop or otherwise.

| Load Center Size | Max Feeder Size |
| ---------------- | --------------- |
| 100A             | 2/0 AWG         |
| 125A             | 3/0 AWG         |
| 150A             | 4/0 AWG         |
| 225A             | 300 kcmil       |
| 400A             | 500 kcmil       |

`ITEM DATABASE`/`WIRE & CABLE ACCESSORIES`/`WIRE LUGS & SPLICING`/`PIGTAIL ADAPTORS...`/`ADAPTOR STRAIGHT PIGTAIL - ...`

#### Meter Center Troughs

Only for PVC subfeeds where we own voltage drop.

* `Area` = "Typical - Building Levels With Meter Centers"
* `System` = "Electrical"
* `Phase` = "Sub Feeders"

`ITEM DATABASE`/`DISTRIBUTION`/`BUDGET ITEMS $ & LBR`/`METER CENTER WIRE TROUGH ($400/E)`
