My steel building has 2"x6" wall studs and 2"x4" exterior purlins. The steel siding is attached with screws to the purlins. I've run my wiring behind the studs and attached it to the top of the purlins. Thus the wiring lays on the purlins behind the 2"x 6" studs. The inspector stopped by and informed me that nail plates are required where less than 1 1/4" of wood is between the wall face and the wiring. Since there is actually 5 1/2" from the inside wall face to the wiring, he's now referring to the exterior wall. I thought the purpose of nail plates was for protection from nails or screws being inserted from the inside of the building. Why would anyone be needing protection from nails or screws being inserted from the outside wall? I didn't argue but I don't think he's correct. I guess I'm wondering if he NEC defines the wall face where nail plates are required? I'd be surprised if the face wall refers to the outside exterior side of the building wall. Thanks
Electrical – Are nail plates required on the exterior wall side of the wall studs
electrical
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Best Answer
The code does not differentiate which face of the stud. It simply says: