vault backup: 2025-10-24

subfeeds-takeoff.md

@@ -3,59 +3,45 @@ id:
 aliases: []
 tags:
   - destiny/permanent
-  - occupational/systems/subfeeds
+  - occupational/takeoff/subfeeds
   - status/draft
   - type/guide
+  - authorship/original
 title: Subfeeds
 ---
 # Subfeeds
 
-## Sequence
+## Unit Load Center Subfeeds
 
-### 1. Preparation
+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.
 
-1. Read about the project specifications and construction type
-  * Delivery Method: (Plans & Specs, Design Build, Design Assist, Preliminary Budget)
-  * Deck Thickness
-  * Corridor Ceiling type
+> [!tip]
+> Identify if and where typicals can be used
 
-2. In the drawings, locate:
-  * Unit Panel Schedules
-  * Unit Load Calculations
-  * Riser Diagram
-  * Subfeed schedule (if present)
+## Multi-Circuit Homerun Subfeeds
 
-### 2. Takeoff
+Typical of hotels and dormitories.
 
-1. Determine wiring method
+Route from panel to center of the room,
+using adders appropriate for the difference in elevation.
 
-    | Construction Type | Wiring Method | Subfeed Options |
-    | ----------------- | ------------- | --------------- |
-    | 1,2               | MC Cable      | MC, PVC, EMT    |
-    | 3,4,5             | NM Cable      | SER, EMT        |
+If voltage drop is to be considered in takeoff,
+Use the table provided in the drawings.
+If no table is provided, use the following:
 
-    %%
-    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
+| Wire Size | Max Length |
+| --------: | ---------: |
+|       #12 |      100ft |
+|       #10 |      200ft |
+|        #8 |     >200ft |
 
 #### Pigtail Adaptors
 
-![[burndy-AYP300_pigtail-adaptor.png]]
+[[distribution-equipment#Pigtail Adaptors|Pigtail Adaptors]]
 
-Pigtail adaptors are used where feeder wires exceed the range of panel lugs.
+Use where conductors are oversized for voltage drop or otherwise.
 
 | Load Center Size | Max Feeder Size |
 | ---------------- | --------------- |
@@ -67,12 +53,6 @@ Pigtail adaptors are used where feeder wires exceed the range of panel lugs.
 
 `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.
@@ -82,7 +62,3 @@ Only for PVC subfeeds where we own voltage drop.
 * `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