2.3 KiB
id, aliases, tags, title
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Wiring Methods Selection |
Wiring Methods Selection
Seek to use the cheapest method, as determined by Senior Construction Estimator and Database Administrator, as allowed for the situation.
!pre-takeoff-research#Requirement Precedence
By Construction Type
See ibc-construction-types for more info.
Construction Types I, II
Nonmetallic-sheathed cables (NM, SE, etc.) are not fire code permissible in these types.
PVC < MC < EMT < IMC < RMC
Construction Types III, IV, V
NM/SE < PVC < EMT < IMC < RMC
By Wiring Method
Electrical Metallic Tubing (EMT)
Fittings
Set-screw < compression
[!info] EMT has a third coupling type "indenter", which are crimped onto the conduit using a special tool. These are usually only mentioned in specifications to say that they are unacceptable.
[!info] Edge Case: Vanderbilt Central Neighborhood Residential College
[!cite] Vanderbilt Central Neighborhood Residential College - Project Specifications (pp.) Fittings for Type EMT Duct Raceways:
- Coupling Method: Compression coupling or Setscrew coupling. Setscrew couplings with only single screw per conduit are unacceptable.
[!quote] Joel Jansen via Microsoft Teams @ 2025-10-15 09:33 AM use set screw 🙂
Rigid Polyvinyl Chloride Conduit (PVC)
Not usually permissible exposed indoors in any construction, except in Florida.
May require rigid stub-ups in certain cases, which could make EMT more cost-effective. Consult with the Senior Construction Estimator in this case.
By Use-Case
Multi-Circuit Homeruns
[!quote] Art Baldwin (pp.) Multi-circuit MC is not cost-effective when considering the difficulty of rework. Use conduit, even EMT if necessary.
By Market Type
Assisted Living
MC-AP may be required.
Searching Specifications
[!info] Example Specs Relevant to Wiring Methods Selection
26XXXX - Raceway And Boxes For Electrical Systems
26XXXX - Conduits For Electrical Systems
26XXXX - Underground Ducts And Raceways For Electrical Systems
26XXXX - Low-Voltage Electrical Power Conductors And Cables
26XXXX - General Requirements For Electrical
26XXXX - Common Work Results For Electrical