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Old 05-11-2013, 07:04 AM   #46
Joined: Mar 2009
Location: Edge of the light
Oddometer: 816
Originally Posted by troidus View Post
Here at work a lot of our fluorescent lighting is 277.

Shortly after we moved into the remodeled building, one of the overhead lights shorted with a quick blue flash, then the whole production area downstairs shut down. Seems they had GFCI on a main breaker down below, but had a low setpoint such that one shorted fluorescent light in an office killed half the building.
If the GFI popped do to a short is doing it's job. However: A run of the mill breaker would have popped anyway if you could see the "flash" from a short.

Can't imagine why lighting was on a GFI breaker as the intent is to protect an individual using receptacle powered devices in wet areas. ie: Bathrooms, kitchens, garages, and loading areas for commercial/industrial. Obviously up to the inspector approving the work...
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Old 05-11-2013, 10:57 AM   #47
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Joined: Feb 2006
Location: tacoma warshington
Oddometer: 2,159
gfi's are installed in larger installations. it's associated with the mains and is there to protect the equipment and would never protect a person! ( it dosen't look anything like the ones you see in bathrooms,outside, etc)..unlike the home depo gfi's, most people see, that are installed to protect people

the_gr8t_waldo screwed with this post 05-11-2013 at 11:07 AM
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Old 05-17-2013, 11:56 PM   #48
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Joined: Dec 2006
Location: Mossyrock, Wa
Oddometer: 140
Originally Posted by burnham View Post
Snap the main breaker on and then off a few times. Do it with a little vigor. Sometimes that will correct the problem for a short time, and let you know what the problem is. Sometimes the breaker won't stay on after, so be warned. Is it a Federal Pacific brand panel?

If you have the original 1973 electric service it's probably due to be replaced anyway.
Please NOBODY take this advice. You could be severely burned or killed.

If that main breaker fails while you are snapping it back and forth with a "little vigor" and go's to ground in the back of your cabinet, you will get to witness the full current load from the transformer on the pole right before your eyes.
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Old 05-22-2013, 02:39 PM   #49
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Joined: May 2009
Location: Dearborn, MI
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A few years ago I had some weird crap going on with the wiring and I finally found that I had a loose connection at the neutral bus in the breaker box. I checked all the others while I was at it. Might be a good starting point.

If you have a Square D QO panel, it's possible to install a whole house surge supressor in the space for a 240 volt double breaker. Just snap it in and connect one wire to the neutral bus.
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