According to Annex E

[wbalsam1]

Multifamily dwellings building, fire-resitive construction, 12 stories in height, all wired in NMB. Meets code. Kinda surprising, but not really.
Any comments? :smile:

 

[bphgravity]

NM for the individual dwelling units, but another wiring method (EMT, maybe MC cable) in the common and corridor areas, right?

 

[wbalsam1]

Multifamily dwellings building, fire-resitive construction, 12 stories in height, all wired in NMB. Meets code. Kinda surprising, but not really.
Any comments? :smile:

But yet if you look at 334.12 it says NM is not permitted in any dwelling or structure not specifically permitted in 334.10(1)(2)&(3) and these provisions only speak of type 3, 4 & 5 construction. Fire-resistive construction is Type 1 and 2. So this seems to say NM is not permitted in Type 1 and 2 construction.
So taken in this context, my quote above is wrong. Doesn't meet code.

So I guess I don't know whether I'm coming or going. Now I tend to believe it's not permitted.:-?:smile:

 

[bphgravity]

Are you certain the building isn't PERMITTED to be other than Type 1 or 2?

For example, lets say the provisions of Chapter 5 and 3 of the IBC permit the building to be of Type 3, however the designer chooses to build the structure with Type 1 or 2 materials.

NM would still be permitted where not restircted by 334.12 of the NEC.

Annex E is not too helpfull unless your state has specifically adopted the NFPA 220 and usues that reference for determining construction type verses Chapter 6 of the IBC...

 

[wbalsam1]

Are you certain the building isn't PERMITTED to be other than Type 1 or 2?

For example, lets say the provisions of Chapter 5 and 3 of the IBC permit the building to be of Type 3, however the designer chooses to build the structure with Type 1 or 2 materials.

I agree.

NM would still be permitted where not restircted by 334.12 of the NEC.

Annex E is not too helpfull unless your state has specifically adopted the NFPA 220 and usues that reference for determining construction type verses Chapter 6 of the IBC...

According to Annex E, the maximum stories is 4 for type 3 multifamily dwellings.