Need help in troubleshooting the following: Outdoor circuit from GCI receptacle to light switch (for pool light), on to two receptacles, all wiring between each is buried 12/2 w/g UF. When powered up, GFCI trips but after 15 sec to 5 minutes. I have isolated the fault to the wires between the switch and receptacle, but am perplexed as to why the delay in tripping the GFCI. Would a nick in the neutral insulation be causing this?
It's not the lights. It will still trip with them out of the circuit. The suspect length of wire will trip the GFCI with nothing connected to the end. A nick is what I suspect, but am surprised by the variable times on the GFCI tripping.
If this is under soil and not concrete, try this. Go to your nearest Big Orange store at about 7:00 am. Locate a couple of fellows hanging around the front area who dress and look like they are from outside your county line. I promise they will work at an affordable rate. Have them re-dig the thing and this time you can put in pvc and upgrade the whole shebang for the customer. Make sure though when you hire your new helpers, that you follow all state and federal hiring laws and also make sure that you have the proper workmans comp and other required insurance in place. This will probably be a less costly solution than trying to TDR the wire and locate a nick, unless you have ready access to the equipment.
Merly pointing out a time tested value packed way to get the fix in without resorting to a lot of test equippment and head scratching. Some days I can see across the county line from my window, but it is 27 miles across deep ocean so I can't quite see what they look like over there.