Presently I have a GFCI (120V) located on an outlet in my utility room of the house. From this outlet on the LOAD side, I have a #12 3 wire cable running in Schedule 40 conduit underground 150 feet to a pole outside in my yard. Things worked Ok for a while but now the GFCI trips all the time.
I unplugged the spot lights from the outside outlet box (protected by code with weatherproof plastic cover box), but the GFCI still trips. I am wondering if I should connect the Ground wire to a ground rod at the pole due to the long cable run which may have enough resistance to make the GFCI trip? I have replaced the GFCI inside the house, same result, checked the cable, no shorts or high resistance shorts.
Can't figure this out !