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#90222 - 11/02/04 10:01 PM Plastic boxes/Commercial use
aldav53 Offline
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Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
Are plastic boxes ok to use in commercial buildings? Some do have a knockout for pipe or mc cable to run into.
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#90223 - 11/03/04 10:05 AM Re: Plastic boxes/Commercial use
electricman2 Offline
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Registered: 11/09/03
Posts: 269
Loc: Thomasville, NC USA
Non-metallic boxes cannot be used with metallic wiring methods unless meeting one of the two exceptions. 314.3.
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#90224 - 11/03/04 08:12 PM Re: Plastic boxes/Commercial use
aldav53 Offline
Member
Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
Why then is there a 1/2" knockout? for PVC? What would be wrong with plastic boxes, there used in homes?
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#90225 - 11/03/04 10:09 PM Re: Plastic boxes/Commercial use
caselec Offline
Member
Registered: 04/14/02
Posts: 558
Loc: San Jose, CA
The non-metalic boxes with standard K.O’s are for ENT (smurf tube) or can be used with RNMC. There is nothing wrong with non-metallic boxes when used with non-metallic wiring methods. You can’t use metal raceways or cable armors with non-metallic boxes since the raceway or armor would not be properly bonded.

Curt
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#90226 - 11/04/04 08:17 AM Re: Plastic boxes/Commercial use
aldav53 Offline
Member
Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
caselec,
Yes true, unless you run metal cable from a bonded metel panel to the plastic box, then its bonded at one end.
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#90227 - 11/04/04 12:52 PM Re: Plastic boxes/Commercial use
zapped208 Offline
Member
Registered: 02/18/03
Posts: 196
Loc: Somewhere in USA
electricman2 has the correct response.
I wonder if a twin M/C connector would satisfy the exception to 314.3?
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