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#90222 - 11/03/04 02:01 AM Plastic boxes/Commercial use  
aldav53  Offline
Member
Joined: Aug 2001
Posts: 545
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 02:05 PM Re: Plastic boxes/Commercial use  
electricman2  Offline
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Joined: Nov 2003
Posts: 269
Thomasville, NC USA
Non-metallic boxes cannot be used with metallic wiring methods unless meeting one of the two exceptions. 314.3.


John

#90224 - 11/04/04 12:12 AM Re: Plastic boxes/Commercial use  
aldav53  Offline
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Joined: Aug 2001
Posts: 545
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 - 11/04/04 02:09 AM Re: Plastic boxes/Commercial use  
caselec  Offline
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Joined: Apr 2002
Posts: 558
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


Curt Swartz

#90226 - 11/04/04 12:17 PM Re: Plastic boxes/Commercial use  
aldav53  Offline
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Joined: Aug 2001
Posts: 545
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 04:52 PM Re: Plastic boxes/Commercial use  
zapped208  Offline
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Joined: Feb 2003
Posts: 196
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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