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#90222 11/03/04 01:01 AM
Joined: Aug 2001
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aldav53 Offline OP
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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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Non-metallic boxes cannot be used with metallic wiring methods unless meeting one of the two exceptions. 314.3.


John
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aldav53 Offline OP
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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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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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aldav53 Offline OP
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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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electricman2 has the correct response.
I wonder if a twin M/C connector would satisfy the exception to 314.3?


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