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Old 09-22-2008, 02:48 PM   #1
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I have a low voltage outdoor lighting system, about 4 yrs old. Without apparent reason, one transformer (Transformer A) on one gfi (gfi A) started tripping the gfi A. No other device ( a different transformer --- connected via ext cord, an electric drill, portable AC unit,) trips gfi A.

The landscaping company came out and checked all of the low volt wiring, transformer and the fixtures with an amp clamp meter and said all is fine. Yet gfi A continues to trip. It typically takes a few minutes but once the tripping occurs, resets trip immediately. Running an extension cord and connecting this low volt transformer A to a different gfi/circuit 'solved' the problem. Landscaping company told me to replace the gfi and/or the circuit breaker.

I then had an electrician come out to replace A gfi but the new gfi (A2) is also tripped by Transformer A trips it , too. Skeptically, the electrician replaced the circuit breaker but no change--Transformer A still trips gfi A2.

So, having spent $175 and no solution, I suggested to Landscaping company that a ground fault is occuring after transformer has been running and heats up. They of ocurse assured me that I am an idiot (in not so many words.)

Should I call another electrician? Should I change the transformer (it out of warranty) OR are we all misssing something else?


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Old 09-22-2008, 04:50 PM   #2
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Ground faults commonly occur in landscape light transformers.

@ 4 years old, it's out of warranty.


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Old 09-22-2008, 05:04 PM   #3
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Thanks for the quick response. That's good to know about the transformer ground faults. Have you heard of other cases where when plugged into one gfi , it trips but not when plugged into other gfis?
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Old 09-22-2008, 05:39 PM   #4
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Maybe the other GFCI is defective. If you plug anything else into GFCIa and NOT the transformer does it trip? If not then that is a pretty good indication of a transformer issue.
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low volt and gfi

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