I actually didn't grasp this properly at first when it got into the codebook. I thought the furring would need to be at least +1-1/4" deep in order to eschew metal stips, but after reading other opinions here I understand it now to what Dennis has posted. Keep it out in the middle +1-1/4" away from the furring and you are ok.
Do I understand this correctly (can't quote the code right now) that Rommex if installed on an exterior wall with furring strip needs to be protected either by conduit or a plate?
Further more, does same rule applies to MC as well?
On the exterior? This would be a damp location. 334.12.
I actually didn't grasp this properly at first when it got into the codebook. I thought the furring would need to be at least +1-1/4" deep in order to eschew metal stips, but after reading other opinions here I understand it now to what Dennis has posted. Keep it out in the middle +1-1/4" away from the furring and you are ok.
On the exterior? This would be a damp location. 334.12.
The op is talking about a basement wall of cinder block that is being furred out so they can sheetrock- or something similar to that.I thought he was talking about furring strips outside with siding installed over , that is not considered outside is it ? if he is talking about running exposed outside with furring strips for protection , I think that is a no go .
You may get different views on this so I would ask the AHJ. The code requires 1-1/4" from the edge of framing members. If you are 1-1/4" off the furring-strip then you would not need protection. Look at 300.4(D)
I thought he was talking about furring strips outside with siding installed over , that is not considered outside is it ? if he is talking about running exposed outside with furring strips for protection , I think that is a no go .
Why are you saying that under the siding, if that were what the op was saying, is outside? I would not consider that outside no more than I would consider wiring in a roof over a porch outside.Yep thats outside. Still would like to know what the OP means.
I actually didn't grasp this properly at first when it got into the codebook. I thought the furring would need to be at least +1-1/4" deep in order to eschew metal stips, but after reading other opinions here I understand it now to what Dennis has posted. Keep it out in the middle +1-1/4" away from the furring and you are ok.
See 08 300.4D , if you have a handbook it shows cable in a ceililng with 3/4 furring strips , the cables must be 1 1/4 away from the strips on exhibit 300.2 . The same is true for the outside walls and for MC cable.
Why are you saying that under the siding, if that were what the op was saying, is outside? I would not consider that outside no more than I would consider wiring in a roof over a porch outside.
Yes the exterior of the siding is outside not the interior part. The nm is protected from the weather. It seems you get caught up in stuff that no one else seems is an issue. This is almost like saying everything in an exterior 2x4 wall is outside.
Do you turn down jobs that have nm cable in a crawl space?
Have you ever seen nm go bad in crawl spaces where there is moisture. I have been in crawl spaces where the place was dripping wet with no effect on the nm.
What do crawl spaces have to do with the discussion at hand?
If the OP's question was NM stapled to the outside of sheathing,
and we do not know if this was his question,
it is a violation to install it there.
What does all this about exteriors have to do with the OP.
It is not.
I have no idea what you are talking about.
If NM was installed in a swimming pool that would also be violation but still has nothing to do with the question.