vault backup: 2025-10-23 10:52:59

2025-10-23 10:52:59 -04:00
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+---
+id:
+aliases: []
+tags:
+  - destiny/permanent
+  - occupational/systems/subfeeds
+  - status/draft
+  - type/guide
+title: Subfeeds
+---
+# Subfeeds
+
+## Sequence
+
+### 1. Preparation
+
+1. Read about the project specifications and construction type
+  * Delivery Method: (Plans & Specs, Design Build, Design Assist, Preliminary Budget)
+  * Deck Thickness
+  * Corridor Ceiling type
+
+2. In the drawings, locate:
+  * Unit Panel Schedules
+  * Unit Load Calculations
+  * Riser Diagram
+  * Subfeed schedule (if present)
+
+### 2. Takeoff
+
+1. Determine wiring method
+
+    | Construction Type | Wiring Method | Subfeed Options |
+    | ----------------- | ------------- | --------------- |
+    | 1,2               | MC Cable      | MC, PVC, EMT    |
+    | 3,4,5             | NM Cable      | SER, EMT        |
+
+    %%
+    TODO: Create flow chart for wiring methods.
+    Some cases to mention:
+    * Deck thickness (minimum 3x conduit outer diameter)
+    * Renovations (may not be able to run in slab)
+    %%
+
+2. Route subfeeds to the Meter Centers using appropriate adder lengths
+   Add an additional 10ft for makeup when using MC cable.
+
+    > [!tip]
+    > Identify if and where typicals can be used
+
+3. Assign material to lengths and apply voltage drop if applicable
+
+4. Takeoff Pigtail Adaptors and Wireway Troughs if applicable
+
+#### Pigtail Adaptors
+
+![[burndy-AYP300_pigtail-adaptor.png]]
+
+Pigtail adaptors are used where feeder wires exceed the range of panel lugs.
+
+| 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 - ...`
+
+> [!info]
+> "Pigtail adaptor" is the most common name and spelling for the device,
+> however it's something of a misnomer,
+> having nothing to do with pigtails (a short length of wire),
+> the name likely stemming from the device being used _in lieu_ of a 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)`
+
+### 3. Review
+
+1. Use the extension tab to determine the Correct Quantity