NM cable

[hhsting]

NM cable can be installed in multifamily dwelling unit for types III, I and B construction 334.10. Would construction type IIIA count as type III in multifamily building where NM can be or cannot be used?

 

[rc/retired]

Yes, a type IIIA building is a type III construction and NM can be used. Barring any local amendments.

 

[petersonra]

Part II. Installation
334.10 Uses Permitted. Type NM, Type NMC, and Type NMS
cables shall be permitted to be used in the following, except as
prohibited in 334.12:
(1) One- and two-family dwellings and their attached or
detached garages, and their storage buildings.
(2) Multi-family dwellings permitted to be of Types III, IV,
and V construction.
(3) Other structures permitted to be of Types III, IV, and V
construction. Cables shall be concealed within walls,
floors, or ceilings that provide a thermal barrier of material
that has at least a 15-minute finish rating as identified
in listings of fire-rated assemblies.

The important thing would appear to be whether the structure is allowed to be one of the specified Types, as opposed to what was actually built.

Is there actually a type that is just III? Or is type III either IIIA or IIIB?

 

[don_resqcapt19]

The important thing would appear to be whether the structure is allowed to be one of the specified Types, as opposed to what was actually built.

Is there actually a type that is just III? Or is type III either IIIA or IIIB?

Exactly...even if you have a Type I or II building, you can still use NM, if the building code permits Type III, IV, or V for that building