Fluorescent Lamps Trip GFI

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Old 10-05-09, 02:58 PM
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Fluorescent Lamps Trip GFI

I have two 4' T12 fluorescent single lamp shop light fixtures controlled by a light switch in a circuit that is protected by a GFI outlet.

Everything else on that circuit works fine. Therefore, I believe that the GFI is OK.

Recently when I attempt to switch on the lights, the GFI trips.

Where should I start to remedy this situation? What component is most likely to be the offending one, the switch, a fixture, a bulb?

Thanks,

baumgrenze
 
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Old 10-05-09, 04:04 PM
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Older GFCIs were more sensitive to false trips. Change the GFCI first. If it still trips try disconnecting one light and see if it trips. If not try only the other light? If both lights trip it when only one is connected try disconnecting both. If it trips with both disconnected it is the wiring. If it trips only with one or both connected the fixtures are bad.

First though I would take a look at the ballast in them. Any sign of a tar like leakage is bad news.
 
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Old 10-05-09, 04:17 PM
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Most common cuprit useally bad ballast but some case bad tombstone { flourscent bulb socket } can affect it as well.

But rarely but it do happend is a small nick on the conductor can do it as well.


Before you replace the ballast you can check the connection and see if you find any nicks on it if not then possiblty that the ballast is going bad or tombstone connections can get funky.

Merci,Marc
 
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Old 10-05-09, 04:28 PM
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Or take the lights off the protected side of the GFCI.
 
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Old 10-05-09, 08:35 PM
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Thank You

Thank you everyone for your suggestions.

I won't get to it for a week or two. The lights are not often used. I will try to remember to post my conclusions.

Thanks again,

baumgrenze
 
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Old 10-06-09, 07:14 AM
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Looking forward to the results.
 
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