Re: Causes of Ground Faults

["Don" <don@xxxxxx>]

"Roland" <roland@xxxxxxxxxxxx> wrote in message
news:fVChh.20683$GB1.14548@xxxxxxxxxxxxxxxxxxxxxxx
>I can't tell you a common one, but I can tell you a weird one. We wired
>this big box store for fire. It had an analog addressable fire system. When
>we put the loops on line and BIG problems. We finally got them sorted out
>but it was an eleventh hour deal with 14 guys pulling their hair out,
>trying to get the CO so the store could open on time. One of the strangest
>problems was when you would isolate a ground to a particular device and
>pull the horn/strobe AV out of the back box and the problem would go away.
>Push it back in (still not touching anything) and the ground would appear.
>To make a long story short it turns out that the wire itself was to blame.
>When you'd strip the wire you noticed that the insulation on the inner
>jackets was nicked at even intervals as far back as you stripped the wire.
>Since it was asymmetric with respect to red and black if the wire was
>stretched out it was normal. When coiled to fit in the box the inner wires
>would touch and a ground fault would appear. The wire manufacturer owned up
>to the problem (after some early crawfishing) and admitted that they had a
>bad run. They made it right to the tune of more than 10 grand so I won't
>mention names.

I have been having that problem on a job. Was it 18/2 w/grnd causing your
problem?
What does 'crawfishing ' mean?