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

[Randy Sadewic]

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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 ¾” 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.  
 
The brand of the covers we buy is Steel City.  I reported this to the
manufacturer, who has agreed that the screws are too long and a change
should be in the works.  In the meantime, we will cut the screws
shorter.
 
Randy
 
Randy Sadewic
randy at positiveenergysolar.com
Positive Energy, Inc.
3225A Richards Lane
Santa Fe, NM  87507
Phone 505 424-1112
Fax     505 424-1113
 
Enjoy the Sun!
 

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