121 lines
3.3 KiB
Markdown
121 lines
3.3 KiB
Markdown
---
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id: feeders
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aliases: []
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tags:
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- occupational
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- occupational/systems/feeders
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---
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# Feeders
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## Info
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## Sequence
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### 1. Estimate preparation
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Read about the project specifications and construction type:
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* Delivery Method (Plans & Specs, Design Build, Design Assist, Preliminary Budget)
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* Deck thickness
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* Wiring method
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* Conductor material (Aluminum/Copper)
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Locate:
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* Riser Diagram
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* Feeder Schedule (if present)
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* Main Electrical rooms and panel locations
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* Routing (if present)
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### 2. Takeoff
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* Choose a starting point on the riser
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* Determine wire & Conduit makeup (3Ph/1Ph, AL/CU, Conduit)
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* Measure off the length of the feed _ADDERS_
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* Square corners, use corridors if possible
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> [!important]
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> All takeoffs in Systems with names including "site"
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> should be in "Site" Area, Phase, and Bid Item breakdowns.
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> [!important]
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> Use 15ft adders for site runs
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> (primaries, secondaries, etc.),
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> as opposed to standard 10ft adder,
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> to account for variability.
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#### Primaries
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#### Secondaries
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#### Feeders
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#### Bus Duct
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`COMMON ASSEMBLIES`/`DISTRIBUTION`/`BUS DUCT`
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#### Cable Support
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> [!quote] 300.19 Supporting Conductors in Vertical Raceways.
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> **(A) Spacing Intervals -- Maximum.**
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> Conductors in vertical raceways shall be supported
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> if the vertical rise exceeds the values in Table 300.19(A).
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> At least one support method shall be provided for each conductor
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> at the top of the vertical raceway or as close to the top as practical.
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> Intermediate supports shall be provided
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> as necessary to limit supported conductor lengths
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> to not greater than those values specified in Table 300.19(A).
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> [!cite] Table 300.19(A) Spacings for Conductor Supports
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>
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> | Conductor Size | Aluminum or Copper-Clad Aluminum | Copper |
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> | -------------------------------- | --------------------------------:| ------:|
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> | 18 AWG through 8 AWG | 100ft | 100ft |
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> | 6 AWG through 1/0 AWG | 200ft | 100ft |
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> | 2/0 AWG through 4/0 AWG | 180ft | 80ft |
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> | Over 4/0 AWG through 350 kcmil | 135ft | 60ft |
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> | Over 350 kcmil through 500 kcmil | 120ft | 50ft |
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> | Over 500 kcmil through 750 kcmil | 95ft | 40ft |
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> | Over 750 kcmil | 85ft | 35ft |
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#### Sleeving
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Provide sleeves for all feeder conduits passing through floors.
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* ID.31 Hilti
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* P = Plastic => Concrete
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* M = Metal => Wood Frame
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* Round 1" to 2"
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#### Grounding
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This is intended to cover electrical and telecom grounding.
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##### System Grounding
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> Area: "01 - Feeders/Risers Building"
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`COMMON ASSEMBLIES`/`GROUNDING`/`GND = #3/0 & 1" CONDUIT - EMT`
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* Length: Measure around the main electrical rooms to stacked
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* Count: Total number of electrical rooms
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`COMMON ASSEMBLIES`/`GROUNDING`/`(3) ... x 10' CU CLAD GRD ROD & 4"X12" GND BAR`
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* Count: 1
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##### Riser
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> Area: "Typical - Building All Electrical Riser Rooms"
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`COMMON ASSEMBLIES`/`GROUNDING`/`GND = #3/0 & 1" CONDUIT - EMT`
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* Length: 15
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* Count: 1
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##### Telecom Ground Bridge
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Use only where shown.
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`COMMON ASSEMBLIES`/`GROUNDING`/`TELE/DATA GND BRIDGE, ..., W/ COVER & (60') #6 THHN GREEN`
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### 3. Extension (Review and Checking)
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