---
id: feeders
aliases: []
tags:
  - occupational/systems/feeders
---
# Feeders

## Info

## Sequence

### 1. Estimate preparation

Read about the project specifications and construction type:
* Delivery Method (Plans & Specs, Design Build, Design Assist, Preliminary Budget)
* Deck thickness
* Wiring method
* Conductor material (Aluminum/Copper)

Locate:
* Riser Diagram
* Feeder Schedule (if present)
* Main Electrical rooms and panel locations
* Routing (if present)

### 2. Takeoff

* Choose a starting point on the riser
* Determine wire & Conduit makeup (3Ph/1Ph, AL/CU, Conduit)
* Measure off the length of the feed _ADDERS_
    * Square corners, use corridors if possible

> [!important]
> All takeoffs in Systems with names including "site"
> should be in "Site" Area, Phase, and Bid Item breakdowns.

> [!important]
> Use 15ft adders for site runs
> (primaries, secondaries, etc.),
> as opposed to standard 10ft adder,
> to account for variability.

#### Primaries

#### Secondaries

#### Feeders

#### Bus Duct

`COMMON ASSEMBLIES`/`DISTRIBUTION`/`BUS DUCT`

#### Cable Support

> [!quote] 300.19 Supporting Conductors in Vertical Raceways.
> **(A) Spacing Intervals -- Maximum.**
> Conductors in vertical raceways shall be supported
> if the vertical rise exceeds the values in Table 300.19(A).
> At least one support method shall be provided for each conductor
> at the top of the vertical raceway or as close to the top as practical.
> Intermediate supports shall be provided
> as necessary to limit supported conductor lengths
> to not greater than those values specified in Table 300.19(A).

> [!cite] Table 300.19(A) Spacings for Conductor Supports
>
> | Conductor Size                   | Aluminum or Copper-Clad Aluminum | Copper |
> | -------------------------------- | --------------------------------:| ------:|
> | 18 AWG through 8 AWG             |                            100ft |  100ft |
> | 6 AWG through 1/0 AWG            |                            200ft |  100ft |
> | 2/0 AWG through 4/0 AWG          |                            180ft |   80ft |
> | Over 4/0 AWG through 350 kcmil   |                            135ft |   60ft |
> | Over 350 kcmil through 500 kcmil |                            120ft |   50ft |
> | Over 500 kcmil through 750 kcmil |                             95ft |   40ft |
> | Over 750 kcmil                   |                             85ft |   35ft |

`ITEM DATABASE`/`CONDUIT & FITTINGS`/`CABLE SUPPORT / WEDGES`/`... COMPLETE FITTING`/...

#### Sleeving

See [[sleeving]].

#### Grounding

This script is intended to cover both electrical and telecom grounding
in lieu of detail sufficient for standard takeoff (e.g. a grounding riser).

`COMMON ASSEMBLIES`/`GROUNDING`

##### System Grounding

> Area: "01 - Feeders/Risers Building"

`COMMON ASSEMBLIES`/`GROUNDING`/`GND = #3/0 & 1" CONDUIT - EMT`

* Length: Measure around the main electrical rooms to stacked
* Count: Total number of electrical rooms

`COMMON ASSEMBLIES`/`GROUNDING`/`(3) ... x 10' CU CLAD GRD ROD & 4"X12" GND BAR`

* Count: 1

##### Riser

> Area: "Typical - Building All Electrical Riser Rooms"

`COMMON ASSEMBLIES`/`GROUNDING`/`GND = #3/0 & 1" CONDUIT - EMT`

* Length: 15
* Count: 1

##### Telecom Ground Bridge

Use only where shown.

`COMMON ASSEMBLIES`/`GROUNDING`/`TELE/DATA GND BRIDGE, ..., W/ COVER & (60') #6 THHN GREEN`

### 3. Extension (Review and Checking)