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Old 01-25-2009, 08:19 PM   #1
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question on deep receptacle boxes..


Hi,

some of those deep receptacle boxes are about the depth of a 2x4, and when you space them out for drywall there ends up being about 5/8" or so gap between the back of the plastic box and the sheathing on the other side of the wall. i know you need to have nail plates on studs when the wire is less than 1-1/4" from the face of a stud. using this same logic, do i have to put nail plates behind the receptacle boxes so that somebody doesn't unknowingly drive a long siding nail right into the receptacle box?

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Old 01-25-2009, 08:40 PM   #2
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question on deep receptacle boxes..


Are you talking about new construction?

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Old 01-25-2009, 08:41 PM   #3
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yes - new construction
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Old 01-25-2009, 08:42 PM   #4
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question on deep receptacle boxes..


I'm thinking that the siding may be on before the electrical install? You pose a good question - never thought about that before.
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Old 01-25-2009, 08:52 PM   #5
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question on deep receptacle boxes..


One reason I do 2x6 construction on my house additions
Plus with the box almost up against the sheathing its like a hole to the outside. Even if new construction w/2x4 eventually the house will be resided
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Old 01-25-2009, 09:25 PM   #6
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I wonder how often a siding nail ends up inside a box. I wonder if the code makers ever thought of this possible problem. Maybe it just doesn't happen enough?
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Old 01-25-2009, 10:15 PM   #7
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question on deep receptacle boxes..


Odds are it has to happen every now & then
I guess it hasn't happened enough to hit the radar screen
I measured a box - 3 3/8" for the deep box
The nails I have for siding are 1.5"
Wood shingles - I know (2) together are not .1/2" thick
My sheathing is 3/4" (old house) - normal is 1/2"

So - normal 1/2" + 1/2" + 1/8" = 1 1/8"
That leaves 3/8" that could penetrate
For me with 3/4" sheathing it would only penetrate 1/8"
And the box is almost 1/8" think?
And of course you would have to hit that spot where the box is
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Old 01-25-2009, 10:34 PM   #8
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question on deep receptacle boxes..


From now on I'm going to be looking for this type of thing when I dig into boxes on exterior walls. I wonder if I'll ever find one? Time will tell!
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Old 01-25-2009, 10:52 PM   #9
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question on deep receptacle boxes..


Normally people look for studs to nail into. So the probability of hitting the box with a nail is much less than the probability of hitting a wire where it passes through a stud.

Hence the requirement to put a metal plate on a stud where the holes drilled for wires are too close to the edge.
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Old 01-25-2009, 11:53 PM   #10
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question on deep receptacle boxes..


I've been an electrician for 18 years and this has never happened to me before. I'm not saying the possibility doesn't exist - it does - but I wouldn't be too worried about it.
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Old 01-26-2009, 07:36 AM   #11
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question on deep receptacle boxes..


ok...so it sounds like there aren't any code requirements for putting a nail plate behind receptacle boxes. guess i'll just be careful not to use too long of nails for the siding

thanks everyone.
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Old 01-26-2009, 12:33 PM   #12
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By all means you can install nail guards if you want too. It's just not an enforceable requirement. Remember the code is minimum safety standards. Extra safety steps performed are IMO an excellent idea.
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Old 01-26-2009, 12:39 PM   #13
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Originally Posted by red86yota View Post
ok...so it sounds like there aren't any code requirements for putting a nail plate behind receptacle boxes.
No, there aren't. But you bring up a good point. Even the holes bored through a 2x4 stud on an outside wall could be penetrated by a nail from outside when hanging siding or mounting a deck etc. Arc fault circuit breakers would help with that possibility.
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Old 01-26-2009, 01:10 PM   #14
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question on deep receptacle boxes..


Quote:
Originally Posted by jrclen View Post
No, there aren't. But you bring up a good point. Even the holes bored through a 2x4 stud on an outside wall could be penetrated by a nail from outside when hanging siding or mounting a deck etc. Arc fault circuit breakers would help with that possibility.
Good call
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Old 01-26-2009, 01:37 PM   #15
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Quote:
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I wonder how often a siding nail ends up inside a box. I wonder if the code makers ever thought of this possible problem. Maybe it just doesn't happen enough?
My panel is mounted in an outside wall with the meter mounted bock to bock with the panel. I had me house resided this summer. They put J-channel around the meter and three nails pierced the panel box through knockouts. The nails partially opened the knockouts and came into the box at various angles. Two of the nails had the potential to reach hot contacts.

I assume the siding crew "felt" the panel box resistance and move the nail until it found the knockout. After all driving a nail through sheathing is like driving a nail through cardboard. The real problem is the meter is smalled than the panel.

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