vault backup: 2025-10-27 16:34:32
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@@ -2,28 +2,22 @@
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id: feeders
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aliases: []
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tags:
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- destiny/permanent
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- status/draft
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- occupational/takeoff/feeders
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- type/guide
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- authorship/original
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title: Feeders
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- destiny/permanent
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- occupational/takeoff/feeders
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- status/draft
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- type/guide
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title: Feeders Takeoff
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---
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# Feeders
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# Feeders Takeoff
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[[conduit-routing]]
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> [!important]
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> Complete [[pre-takeoff-research]],
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> including [[wiring-method-selection]],
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> before beginning takeoff.
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## Info
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#### Fire Rated Feeders
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## Execution
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PDI estimating practice is to run all "emergency" feeds
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(life-safety or just standby)
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in a 2-hour rated assembly.
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This usually requires no change to takeoff for high-rises
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since electrical riser rooms are themselves fire-rated.
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* RHW-2 insulated conductors in conduit -- "Lifeline Cable"
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* 2-hour rated metal clad cable -- "Vitalink"
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### Formatting
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All feeder takeoff descriptions should be prefixed with `<parent> TO <child>`
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@@ -33,22 +27,7 @@ All feeder takeoff descriptions should be prefixed with `<parent> TO <child>`
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> (i.e. meter centers fed from bus plugs)
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> so long as the typical is in the Feeders `Area`.
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## Sequence
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### 1. Preparation
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Read about the project specifications and construction type:
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* Deck thickness
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* Wiring methods
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* Conductor material
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* Wire terminations (set-screw acceptable or compression required?)
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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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### 2. Takeoff
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### Routing
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Run parallel to building lines
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and route through corridors where possible.
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@@ -67,42 +46,38 @@ or 10ft, whichever is greater.
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Add an additional 5ft (total 15ft) for site runs
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(primaries, secondaries, etc.).
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#### Primaries
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## Primaries
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Usually only empty conduit if included.
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#### Secondaries
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## Secondaries
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##### Wiring on Vault Racks
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### Wiring on Vault Racks
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Where secondary conductors run on racks in utility vaults
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manually set the length of conduit,
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measure the wire length,
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add 20ft in addition to previously mentioned adders.
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#### Feeders
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## Feeders
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`Area` = "01 - Feeders/Risers Building"
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for all feeders, no matter the location.
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#### Bus Duct
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## Bus Duct
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`COMMON ASSEMBLIES`/`DISTRIBUTION`/`BUS DUCT`
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#### Conductor Support
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## Conductor Support
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![[nfpa-70_300_general-requirements#300.19(A) Spacing Intervals -- Maximum.]]
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![[nfpa-70]]
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`ITEM DATABASE`/`CONDUIT & FITTINGS`/`CABLE SUPPORT / WEDGES`/`... COMPLETE FITTING`/...
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#### Grounding
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## Grounding
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See [[grounding-takeoff]].
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#### Sleeving
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## Sleeving
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See [[sleeving-takeoff]].
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### 3. Review
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