Bad Grounding and Good Luck

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COFFEE TIME said:
steve. in reading this post i got to ask you a guestion. did you remove all the grounds that was on the neutral bus if not you may want to look at article 550.... 550.16- 550.16a,b,c
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With mobile homes, they already are separated from the factory, so that should not have been an issue. They have used 4 wire for ranges and dryers long before it was required in houses. Troubleshooted a wood frame, wood sided house that all of the nail heads, propane tank were live. The builder had used foil backed styrofoam as sheathing, He had spliced the stove cable in the attic in a metal octagon j-box that was not grounded, shorting one of the hots to the box. The nail that he had used to fasten the box pierced the foil on the insulation, causing it become live, thus making the nailheads and the copper gas line that run through it hot!
 
Kdawg67 said:
On reading that last post, I was wondering how the nail heads could all have gotten energized... So the foil behind the siding was the culprit... Interesting.
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The nails were driven through the foil when the siding was applied (board and batten inside and out) The problem was discovered when the gas line installer was shocked drilling a hole for his line. Turned off breakers until the voltage disappeared, found that it was the oven circuit, with these type cabins, the builder always used too long of nails, so I thought there was a nail driven into a hot somewhere, then the builder said "Oh I put a junction box in the attic for that wire" When I seen that it was a standard metal octagon box that he spliced three #6's with split bolts, and still got the cover on I knew I found the problem, one of the poorly taped splitbolts was shorting against cover.
 
3 #6's w/split bolts in a 4" octogon! Wow!
Wondering how split-bolts get figured into box fill. Really wondering how he got that all to fit!
Jamming them in there, I suppose. :roll:
 
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