Ground Fault using SG/DG weatherproof boxes [RE-wrenches]

William Miller wrmiller at charter.net
Fri Mar 17 13:27:36 PST 2006


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Randy:

Here is yet another reason to avoid the use of MC cables!  Just say no.

William Miller



At 12:16 PM 3/17/2006, you wrote:

>Wrenches,
>We use outdoor rated SG and DB boxes and blank covers when we have
>strings dispersed across a flat roof to transition from MC wire.
>Recently, I had an inspection of a 3kw system where the inspector took
>off the cover of a single gang, waterproof box and caused a ground fault
>when he put the cover back on.
>
>The reason for this is the box cover screws are =BE=94 which is
>unnecessarily long. When the inspector wedged the taped split bolt back
>in the box he positioned it directly behind the screw hole. The screw
>bored through a thick layer of tape like butter to the split bolt
>causing the ground fault.
>

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