---
tags:
  - occupational/takeoff
  - status/draft
  - type/guide
title: Subfeeds
---
# Subfeeds Takeoff

Use 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.

### Wiring Method Selection

[[wiring-method-selection#Multi-Circuit Homeruns]]

### Voltage Drop

_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 |

## Unit Load Center Subfeeds

Route from meter center to unit load center.

#### Voltage Drop

Larger of the listed demand current
and 80% of the panel rating.

#### 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)`