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Pow Boom

@mycingular.net
reply to Jack_in_VA

Re: [Electrical] Wired a panel for the first time.

The reasonably experienced homeowner was installing an additional circuit. In the process, he moved the #2 feeders in order to access the connector locknut. When he pushed the feeders back toward their original location, he unknowingly dislodged the breaker. When he went to pull the cable through the connector, the breaker fully disengaged and slid back to the point where the exposed buss stabs on the type CH breaker made contact with the metal breaker retaining rail. The resulting arcing destroyed the breaker, caused enough damage to the panel to warrant replacement and landed the homeowner in the ER with facial and corneal burns. Without entering into a debate as to whether non-qualified people have any business in the panel to begin with, the proper breaker hold-down strap (as required by the NEC and the panel manufacturer when back-feeding breakers) would have prevented the entire ordeal. Of course, had the breaker been one that used enclosed slot stabs such as GE type THQL, Eaton type BR, Siemens/Murry or Square D Homeline, it probably would have been averted then too.

Mango
What router are you using?
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join:2008-12-25
www.toao.net
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Do any of the Canadians here know where I could get one of these? Home Depot, Rona, Home Hardware, and Canadian Tire don't have them, at least not that I could find online.


Jack_in_VA
Premium
join:2007-11-26
North, VA
kudos:1
Reviews:
·Millenicom

4 edits
reply to Pow Boom
said by Pow Boom :

The reasonably experienced homeowner was installing an additional circuit. In the process, he moved the #2 feeders in order to access the connector locknut. When he pushed the feeders back toward their original location, he unknowingly dislodged the breaker. When he went to pull the cable through the connector, the breaker fully disengaged and slid back to the point where the exposed buss stabs on the type CH breaker made contact with the metal breaker retaining rail. The resulting arcing destroyed the breaker, caused enough damage to the panel to warrant replacement and landed the homeowner in the ER with facial and corneal burns. Without entering into a debate as to whether non-qualified people have any business in the panel to begin with, the proper breaker hold-down strap (as required by the NEC and the panel manufacturer when back-feeding breakers) would have prevented the entire ordeal. Of course, had the breaker been one that used enclosed slot stabs such as GE type THQL, Eaton type BR, Siemens/Murry or Square D Homeline, it probably would have been averted then too.

The code calls for the restraint therefore it should be installed. No debate on that and is a non-issue.

The homeowner was by letting this happen could not be considered reasonably experienced. His panel obviously did not have the restraint on the back fed breaker and he failed to take the necessary precautions on working in the panel.

You cannot make statements like that to ignore the fact the homeowner was not qualified thus allowing the incident to happen. It's his own fault and not the equipment. It's bad he was injured but that's what happens sometimes when unqualified people work on energized electrical equipment.

Any experienced and trained electrician understands the hazards of working a panel "hot" and the added back fed breaker. All that is needed is to hold the breaker in place with a electrical gloved hand while moving the wires feeding it with the other hand. Or better yet given he was unqualified he should have just killed the power to the backfed breaker thereby killing the power to the entire panel while working on it.


LazMan
Premium
join:2003-03-26
canada

1 recommendation

reply to Mango
said by Mango:

Do any of the Canadians here know where I could get one of these? Home Depot, Rona, Home Hardware, and Canadian Tire don't have them, at least not that I could find online.

Westburne would be a good starting point...

»west.westburne.ca/branchLocator.···=locator

It's not something your average weekend warrior would need; so not at all surprised a big-box store wouldn't have them; or likely even know they existed...