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

feeders-takeoff.md

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+---
+id: feeders
+aliases: []
+tags:
+  - destiny/permanent
+  - status/draft
+  - occupational/systems/feeders
+  - type/guide
+title: 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.
+
+> [!cite] Joel Jansen 2025-08-21, in reference to Belle Meade Plaza (pp.)
+> PT slabs do have some affect on takeoff.
+> 3in conduit can not be run in an 11in PT slab.
+
+#### 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.
+
+#### Fire Rated Feeders
+
+PDI estimating practice is to run all "emergency" feeds
+(life-safety or just standby)
+in a 2-hour rated assembly.
+This usually requires no change to takeoff for high-rises
+since electrical riser rooms are themselves fire-rated.
+
+* RHW-2 insulated conductors in conduit -- "Lifeline Cable"
+* 2-hour rated metal clad cable -- "Vitalink"
+
+### 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
+> (i.e. meter centers fed from bus plugs)
+> so long as the typical is in the Feeders `Area`.
+
+## Sequence
+
+### 1. Preparation
+
+Read about the project specifications and construction type:
+* Deck thickness
+* Wiring methods
+* Conductor material
+* Wire terminations (set-screw acceptable or compression required?)
+
+Locate:
+* Riser Diagram
+* Feeder Schedule (if present)
+* Main Electrical rooms and panel locations
+
+### 2. Takeoff
+
+Run parallel to building lines
+and route through corridors where possible.
+
+> [!important]
+> All takeoffs in Systems with names including "site"
+> should be in "Site" Area, Phase, and Bid Item breakdowns.
+
+For adjacent panels, use a minimum 10ft length.
+
+#### Adders
+
+Use the difference in elevation between equipment
+or 10ft, whichever is greater.
+
+Add an additional 5ft (total 15ft) for site runs
+(primaries, secondaries, etc.).
+
+#### Primaries
+
+Usually only empty conduit if included.
+
+#### Secondaries
+
+##### Wiring on Vault Racks
+
+Where secondary conductors run on racks in utility vaults
+manually set the length of conduit,
+measure the wire length,
+add 20ft in addition to previously mentioned adders.
+
+#### Feeders
+
+`Area` = "01 - Feeders/Risers Building"
+for all feeders, no matter the location.
+
+#### Bus Duct
+
+`COMMON ASSEMBLIES`/`DISTRIBUTION`/`BUS DUCT`
+
+#### Conductor Support
+
+![[nfpa-70_300_general-requirements#300.19 Supporting Conductors in Vertical Raceways.]]
+
+`ITEM DATABASE`/`CONDUIT & FITTINGS`/`CABLE SUPPORT / WEDGES`/`... COMPLETE FITTING`/...
+
+#### Grounding
+
+See [[grounding]].
+
+#### Sleeving
+
+See [[sleeving]].
+
+### 3. Review