3.8 KiB
id, aliases, tags
| id | aliases | tags | |
|---|---|---|---|
| feeders |
|
Feeders
Info
Routing and Structural Considerations
Shear Walls
Shear walls, like those around stairwells and elevator shafts, may be routed through with special permission.
Post-Tensioned Slabs
[!example] STRUCTURAL SLAB IS AN 8-INCH THICK UNBONDED POST-TENSIONED TWO-WAY SLAB UNLESS NOTED OTHERWISE.
[!cite] Joel Jansen 2025-08-15, in reference to Belle Meade Plaza, pp. No affect on takeoff. Routing in slab still possible.
Pan Deck Slabs
[!example] STRUCTURAL SLAB IS 3 1/2 INCHES OF NORMALWEIGHT CONCRETE ON 3-INCH COMPOSITE STEEL DECK UNLESS NOTED OTHERWISE.
[!cite] Joel Jansen 2025-08-15, in reference to Belle Meade Plaza, pp. Do not route in slab.
Formatting
All feeder takeoff descriptions should be prefixed with <parent> TO <child>
[!cite] Joel Jansen, in reference to Omni Hotels Raleigh, pp. It is acceptable to use typicals for identical feeders so long as the typical is in the Feeders
Area
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.
Adders
Use the difference in elevation between equipment or 10ft, whichever is greater.
Add an additional 5ft for site runs (primaries, secondaries, etc.).
Primaries
Empty conduit.
Secondaries
[!info] Vaults and Secondary Connections In utility vaults, secondary conductors sometimes run on racks, far past their entrance conduits, to their transformers. It is necessary to add this distance to the wire makeup, rather than simply measure the conduit assembly to the transformer.
Feeders
Bus Duct
COMMON ASSEMBLIES/DISTRIBUTION/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
ITEM DATABASE/CONDUIT & FITTINGS/CABLE SUPPORT / WEDGES/... COMPLETE FITTING/...
Grounding
See grounding.
Sleeving
See sleeving.