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

[Allan Sindelar]

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William,
I'm afraid I am missing your point. "Another reason to avoid the use of MC
cables"? What do you prefer, and why? We haven't had any significant
problems with MC cables, and they certainly are much faster than J-boxes in
most applications.

Thanks, Allan at PosE

----- Original Message ----- 
From: "William Miller" <wrmiller at charter.net>

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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