vault backup: 2025-10-27 16:34:32
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@@ -13,7 +13,7 @@ title: Wiring Method Selection
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Determine where each wiring method can be used.
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NM/SER < PVC < MC < EMT-SS < EMT-Comp < IMC
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## Example Wiring Method Selection
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Below is an example Wiring Method Selection
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for a [[ibc-construction-types#5-Over-1 Construction|podium]] construction.
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@@ -43,7 +43,36 @@ I know PVC is preferable to MC in the case of feeders, subfeeds, and possibly ho
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but I think they swap for branch.
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-->
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## Slab Thickness
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## Standard Indoor Wiring Methods
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NM/SER < PVC in Slab < MC < EMT-SS < EMT-Comp
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### NM/SER Overhead
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Nonmetallic-sheathed cables are combustible,
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so not permissible in Non-Combustible (Type I, II) constructions.
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See [[ibc-construction-types]] for more info.
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#### Concealment
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Cable type wiring methods (MC, NM, SE)
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may only be used where they will be concealed from view.
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### PVC in Slab
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May require rigid stub-ups in certain cases,
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which could make EMT more cost-effective.
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Consult with the Senior Construction Estimator in this case.
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#### Garage Slab
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_Conventional Slab_: PVC in Slab
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_Precast_: EMT
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See [[pdi-breakdowns#Garage]] for more info.
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#### Slab Thickness
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Conduits may not be routed through slabs of thickness
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less than 3 times the outer diameter of the conduit.
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@@ -52,7 +81,7 @@ less than 3 times the outer diameter of the conduit.
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| ------------:| ---------------------------:|
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| 1/2" | 3.0 |
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| 3/4" | 3.5 |
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| 1" | 4.0 |
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| 1" | 4.0 |
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| 1-1/4" | 5.0 |
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| 1-1/2" | 6.0 |
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| 2" | 7.5 |
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@@ -63,45 +92,51 @@ less than 3 times the outer diameter of the conduit.
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| 5" | 17.0 |
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| 6" | 20.0 |
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## By Finish
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#### Shear Walls
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Cable type raceways (MC, NM, SE)
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[[construction-methods#Shear Walls|Shear Walls]]
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Shear walls, like those around stairwells and elevator shafts,
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may be routed through with special permission.
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#### Post-Tensioned Slabs
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[[construction-methods#Post-Tensioned Slab|Post-Tensioned Slab]]
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> [!cite] Joel Jansen 2025-08-15, in reference to Belle Meade Plaza (pp.)
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> No affect on takeoff. Routing in slab still possible.
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> [!cite] Joel Jansen 2025-08-21, in reference to Belle Meade Plaza (pp.)
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> PT slabs do have some affect on takeoff.
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> 3in conduit can not be run in an 11in PT slab.
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#### Pan Deck Slabs
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[[construction-methods#Pan Deck Slab|Pan Deck Slab]]
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> [!cite] Joel Jansen 2025-08-15, in reference to Belle Meade Plaza (pp.)
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> Do not route in slab.
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### MC Cable Overhead
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_Market Type = Assisted Living:_ MC-AP may be required.
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#### Concealment
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Cable type wiring methods (MC, NM, SE)
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may only be used where they will be concealed from view.
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Exception:
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Temporary provisions for unfinished spaces (e.g. core and shell retail)
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## By Construction Type
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Nonmetallic-sheathed cables (NM/SER)
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are not permissible in Non-Combustible (Type I, II) constructions.
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See [[ibc-construction-types]] for more info.
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## By Use-Case
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### Multi-Circuit Homeruns
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#### Multi-Circuit Homeruns
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> [!quote] Art Baldwin (pp.)
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> Multi-circuit MC is not cost-effective
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> when considering the difficulty of rework.
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> Use conduit, even EMT if necessary.
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* Market Type = Assisted Living: MC-AP may be required.
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## By Specification
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> [!info] Example Specs Relevant to Wiring Methods Selection
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> * 26XXXX - Raceway And Boxes For Electrical Systems
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> * 26XXXX - Conduits For Electrical Systems
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> * 26XXXX - Underground Ducts And Raceways For Electrical Systems
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>
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> * 26XXXX - Low-Voltage Electrical Power Conductors And Cables
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>
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> * 26XXXX - General Requirements For Electrical
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> * 26XXXX - Common Work Results For Electrical
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### Electrical Metallic Tubing (EMT)
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### EMT Overhead
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Set-screw fittings may not be acceptable.
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@@ -121,21 +156,42 @@ Set-screw fittings may not be acceptable.
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> > [!quote] Joel Jansen via Microsoft Teams @ 2025-10-15 09:33 AM
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> > use set screw 🙂
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### Rigid Polyvinyl Chloride Conduit (PVC)
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## Standard Outdoor Wiring Methods
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Not usually permissible exposed indoors in any construction,
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except in Florida.
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PVC Underground < EMT-Comp < IMC
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May require rigid stub-ups in certain cases,
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which could make EMT more cost-effective.
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Consult with the Senior Construction Estimator in this case.
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### PVC Underground
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May require rigid stub-ups.
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### EMT Overhead
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Use compression fittings.
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## Nonstandard Indoor Wiring Methods
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### PVC Overhead
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Not usually permissible, except in Florida.
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## By Specification
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> [!info] Example Specs Relevant to Wiring Methods Selection
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> * 26XXXX - Raceway And Boxes For Electrical Systems
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> * 26XXXX - Conduits For Electrical Systems
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> * 26XXXX - Underground Ducts And Raceways For Electrical Systems
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>
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> * 26XXXX - Low-Voltage Electrical Power Conductors And Cables
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>
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> * 26XXXX - General Requirements For Electrical
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> * 26XXXX - Common Work Results For Electrical
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## Flow Chart
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```mermaid
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flowchart LR
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A[Construction Type]
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A -- I, II --> B[Can can be run in slab?]
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A -- I, II --> B[Can be run in slab?]
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B -- No --> D[Concealed?]
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B -- Yes --> PVC
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D -- No --> EMT
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@@ -143,5 +199,15 @@ flowchart LR
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A -- III, IV, V --> C[Concealed?]
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C -- No --> PVC
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C -- Yes --> NM/SER
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```
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```
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#### Fire Rated Feeders
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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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