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romex, used on a solid block wall ? #17076
11/20/02 01:04 PM
11/20/02 01:04 PM
M
mj  Offline OP
Member
Joined: Jun 2002
Posts: 186
meriidian, ms
an electrical contractor wants to use romex to rewire a house that has solid block walls. the walls will be coverd with sheetrock, about 1 inch hollow will be between the sheetrock in the block wall. have you guys ever hear of such a wiring pratice? any advice ? any code violations in the above procedure ?

Work Gear for Electricians and the Trades
Re: romex, used on a solid block wall ? #17077
11/20/02 02:35 PM
11/20/02 02:35 PM
W
Wirenuttt  Offline
Member
Joined: Nov 2002
Posts: 267
Massachusetts
I know there has to maintain an 1 1/4" space between romex and finish surfaces. I believe m/c falls in the same class. I would prefer emt with surface mount 4" sq's and apply the proper plaster ring to finsh surface.

Re: romex, used on a solid block wall ? #17078
11/20/02 04:25 PM
11/20/02 04:25 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,919
Brick, NJ USA
MJ:
Besides the romex situation, what kind of box is the installer proposing???
From your post, I assume that furring strips aregoing to be fastened to the block wall, and sheetrock will be attached to the furring strips. You cannot staple/strap the RX to the furring strip sides, as you cannot maintain 1 1/4" of clearance to prevent nail damage. 1/2" EMT would work, but you have to install a box.
John


John
Re: romex, used on a solid block wall ? #17079
11/20/02 05:29 PM
11/20/02 05:29 PM
M
mj  Offline OP
Member
Joined: Jun 2002
Posts: 186
meriidian, ms
thanks,hotline... i forgot about the 1 1/4 rule and also the depth for the boxes.

Re: romex, used on a solid block wall ? #17080
11/20/02 05:57 PM
11/20/02 05:57 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Guys,
What code section can you cite for this application?
Don


Don(resqcapt19)
Re: romex, used on a solid block wall ? #17081
11/20/02 06:13 PM
11/20/02 06:13 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,344
thank you Don,

(i guess we have an inherent 1 1/4" fixation ....)

300.4(D) states framing members, such as 'joists, rafters or studs'....does 'such as' also include furring strips??

Re: romex, used on a solid block wall ? #17082
11/20/02 06:59 PM
11/20/02 06:59 PM
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
I've always used 1-1/2" Deep 4x4s and 1/2" (or 5/8") plaster rings. 3/4" EMT for physical protection of the NM-B Cable up to the area above the ceiling.

Don, please let me know if this is overboard, it's darned expensive on a bid job!


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
Re: romex, used on a solid block wall ? #17083
11/20/02 07:03 PM
11/20/02 07:03 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Sparky,
I think that is the way to go, but I just can't find a code citation to require that type of protection for this appliction.
Don


Don(resqcapt19)
Re: romex, used on a solid block wall ? #17084
11/20/02 07:30 PM
11/20/02 07:30 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,344
i do the same Virgil, with these on the cieling end;

[Linked Image]

btw;
have you guys seen those who run nm aside furring strips on cielings? not my cup of tea, yet i do not believe in violation..

Re: romex, used on a solid block wall ? #17085
11/20/02 07:34 PM
11/20/02 07:34 PM
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Dude! Where do you get those!

I use emt connectors and remove the locknut, put on a bushing, and make sure it's stapled within 12".

Those are awesome! I wonder if my supplier has 'em?

[This message has been edited by sparky66wv (edited 11-20-2002).]


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
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