vault backup: 2025-07-24 16:44:33

2025-07-24 16:44:33 -04:00
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+---
+id: feeders
+aliases: []
+tags:
+  - 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
+
+#### 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 |
+
+#### Sleeving
+
+Provide sleeves for all feeder conduits passing through floors.
+
+* ID.31 Hilti
+    * P = Plastic => Concrete
+    * M = Metal => Wood Frame
+    * Round 1" to 2"
+
+### 3. Extension (Review and Checking)