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Old 09-16-2009, 04:07 PM   #31
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GFCI breaker trips randomly


Bimmer, This is NOT causing your GFCI problem
But give those wire-nuts some more twists
.
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Old 09-16-2009, 06:50 PM   #32
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GFCI breaker trips randomly


Another thing to check is the romex staples. As with the clamps, if a staple is driven in to hard it could cause the breaker to trip. You could remove the GFCI breaker replace it with a regular breaker. Remove the recpt. and replace it with a 20 amp GFCI recpt. Just a thought.
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Old 09-17-2009, 11:43 AM   #33
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GFCI breaker trips randomly


Quote:
Originally Posted by rkess View Post
Another thing to check is the romex staples. As with the clamps, if a staple is driven in to hard it could cause the breaker to trip. You could remove the GFCI breaker replace it with a regular breaker. Remove the recpt. and replace it with a 20 amp GFCI recpt. Just a thought.
Yes. But (IMHO) the reason for the INTERMITTENT nature of the breaker trip is a moisture condition somewhere. A regular short or ground fault would cause the breaker to trip with great fanfare (Lots of fireworks and noise)! (No matter what)Don't Drink and Drive, Ever!!!
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Old 09-17-2009, 11:47 AM   #34
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GFCI breaker trips randomly


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Yes. But (IMHO) the reason for the INTERMITTENT nature of the breaker trip is a moisture condition somewhere. A regular short or ground fault would cause the breaker to trip with great fanfare (Lots of fireworks and noise)! (No matter what)Don't Drink and Drive, Ever!!!
Could it be moisture condition near the panel which would only effect the GFCI breaker?
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Old 09-17-2009, 11:52 AM   #35
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GFCI breaker trips randomly


Quote:
Originally Posted by spark plug View Post
Yes. But (IMHO) the reason for the INTERMITTENT nature of the breaker trip is a moisture condition somewhere. A regular short or ground fault would cause the breaker to trip with great fanfare (Lots of fireworks and noise)! (No matter what)Don't Drink and Drive, Ever!!!
Since it is a GFCI breaker, contact between the neutral and ground will cause a trip with no "fanfare" whatsoever. Moisture, metal expansion, vibration could all cause random tripping if the wires are very close together or a clamp has cut into the insulation.
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Old 09-21-2009, 10:03 AM   #36
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GFCI breaker trips randomly


well, I didnt get a chance to look at anything this past weekend, but the breaker hasn't tripped since I started this thread.
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Old 09-21-2009, 11:10 AM   #37
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GFCI breaker trips randomly


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well, I didnt get a chance to look at anything this past weekend, but the breaker hasn't tripped since I started this thread.
I'd put a milliammeter in series with a 1/16th A fuse in series with the ground lead from the busbar to see how close you are to tripping.
90' of Romex will normally give you 0.5 mA due to capacitive coupling. If you have 3 or 4 mA there is probably a problem that hasn't yet tripped the GFCI.
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Old 09-21-2009, 11:13 AM   #38
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GFCI breaker trips randomly


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I'd put a milliammeter in series with a 1/16th A fuse in series with the ground lead from the busbar to see how close you are to tripping.
90' of Romex will normally give you 0.5 mA due to capacitive coupling. If you have 3 or 4 mA there is probably a problem that hasn't yet tripped the GFCI.
1/16A? where would I get that?
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Old 09-21-2009, 01:36 PM   #39
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GFCI breaker trips randomly


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1/16A? where would I get that?
Possibly Radio Shack.
If you're on the 200 mA scale the meter's internal fuse might be 500 mA. You want a series fuse small enough that it trips instead of your meter's internal fuse.

The other way is to measure the cold resistance of a 4w or 7-1/2w 120v incand. lamp and use this as a current sensing resistor, in series with the ground lead.
If the lamp filament reads 100 ohms and the voltage across it is 0.4v then 4 mA is passing through the ground lead.

But always start with your meter set on the highest voltage or current scale.
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Old 09-21-2009, 01:46 PM   #40
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GFCI breaker trips randomly


Thanks
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Old 09-21-2009, 02:11 PM   #41
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GFCI breaker trips randomly


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Thanks
My pleasure. Good luck.

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