intermittent tripping breaker

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  #1  
Old 01-06-14, 10:56 AM
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intermittent tripping breaker

I have a breaker which trips intermittently even if power is not being drawn on the circuit. Sometimes weeks can go by without it happening. I replaced the breaker with a new one. Square D - QO series. Still happened. The circuit is in a conduit ( pvc ) to a box outside. It only feeds 2 Leviton DHC home control switches one each for both the pool lights and some landscape lights. The first thing I did was to disconnect all feeds at the box and let it sit for weeks. No tripping whatsoever. Next I hooked up the pool lights and let it sit for weeks. No tripping. Did the same for the landscape lights. No tripping. I replaced all the landscape lights along with new splices because I noticed that the uplights were not enclosed or approved for that use and there was debris and water in every one, although they worked perfectly. The new lights will be on all day , no problems. When everything is reconnected and shut off and sitting for weeks without use, I'll notice the breaker tripped. Any thoughts ??? I've racked my brains and am truly stumped. Will The Leviton DHC switches cause a problem like this ??? Never seen it before in 25 years.
 
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Old 01-06-14, 11:36 AM
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Is it a GFCI breaker?

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Old 01-06-14, 11:51 AM
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Are all your lights and switches in weatherproof boxes and properly sealed from the elements? Where is your ground fault circuit interrupter?
 
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Old 01-06-14, 03:11 PM
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Chandler, the outside box is a PVC FS box with a gasket. Probably not the tightest seal but I don't see enough rain water getting in there to trip the breaker. It would have to fill high enough to short the ground with the hot. I did think about changing the covers. The GFCI protection is further down the circuit by the pool equipment.
 
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Old 01-06-14, 03:50 PM
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You should have those ugly " in use" covers in place. Your GFCI protection should start as the circuit exits the building at the first receptacle.
 
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