Ek's Home   |   Forum   |   Chat   |   Electrical Links   |  





Subject - wiring
kar Can I use NMC-Romex in concrete walls?
lctrc789 If you are really wanting to put NM or romex in concrete walls that are poured the answer is no you cannot. Article 336-5 (a)8.
But if you are running it through concrete blocks only, yes you can. Article 336-4(b) 1-2-3.
But you have to use caution for these type of installations.
Ryan_J See 334.10(B)(3).
kbsparky throwing a wrench into the machinery ...

FWIW, type UF cable can be dual-rated the same as type NMC.

And, for clarification, the 2005 NEC has NM and NMC cables under article 334. Older versions of the Code have it listed in 336.

And type UF cable can be found under article 340 in the 2005 edition of the Code

Also, it should be noted that type "NM" cable has not been manufactured for 20 years now. It has been replaced with type NM-B, which the Code does not specifically recognize. Your guess as to why is as good as mine

(removing wrench from machinery)

-Ken
ohara7
quote:
Originally posted by kbsparky

throwing a wrench into the machinery ...

FWIW, type UF cable can be dual-rated the same as type NMC.

And, for clarification, the 2005 NEC has NM and NMC cables under article 334. Older versions of the Code have it listed in 336.

And type UF cable can be found under article 340 in the 2005 edition of the Code

Also, it should be noted that type "NM" cable has not been manufactured for 20 years now. It has been replaced with type NM-B, which the Code does not specifically recognize. Your guess as to why is as good as mine

(removing wrench from machinery)

-Ken
the B in NM-B stands for 90C insulation 600v type NM 60C 300v
kbsparky
quote:
the B in NM-B stands for 90C insulation 600v type NM 60C 300v


Yes, I was aware of that. My problem here is that this information is not found in the NEC, even though the manufacture and use of it has been ongoing for 20 years now. They are essentially treated the same, but the two types are quite different as you have stated.
Ryan_J All NM cable being manufactured now is 90 degrees, but see 334.80 for limitations.