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Joined: Jun 2002
Posts: 186
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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 ?
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Joined: Nov 2002
Posts: 267
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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.
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Joined: Apr 2002
Posts: 7,382 Likes: 7
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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
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Joined: Jun 2002
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thanks,hotline... i forgot about the 1 1/4 rule and also the depth for the boxes.
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Joined: Nov 2000
Posts: 2,148
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Guys, What code section can you cite for this application? Don
Don(resqcapt19)
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Joined: Oct 2000
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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??
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Joined: Nov 2000
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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
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Joined: Nov 2000
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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)
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Joined: Oct 2000
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i do the same Virgil, with these on the cieling end; 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..
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Joined: Nov 2000
Posts: 2,236 Likes: 1
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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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