When I place GFCI breaker into panel and turn the power on, there is no power that I can measure on the hot leg. I measure it between white wire (neutral) and the hot leg. Yes, the pigtail white wire is connected to neutral. Tried 3 different GFCI, none of them worked. Regular one has power and measures around 130V. Disconnected everything from panel, took all breakers (3) out and just tested old breaker, and they used 2 more that I bought. Same result.
Background: This is a sub-panel by the pool, that is connected to main panel in the garage via 6AWG wires to a double pole 50 amp breaker. Wires are all in conduit, connections glued. About 30 feet is underground. There are 4 wires, green, white, red, black, rated underground. This has worked without any issues for 2 years, no changes, no digging, no drilling nothing. Just one day, double pole breaker outputs no electricity. I tried resetting it several times, and sometimes it stays engaged, sometimes it does not. Testing works, pressing test button reset is (when it initially stays up). Single pole GFCI breaker will not even stay engaged. I measured voltage between hot legs and neutral at the entrance to subpanel, both have power, 130V.
I disconnected green (ground) and white (neutral) and measured resistance and it shows 0 Ohms. Does this mean that there is short between white and green? Is there a way to confirm this?
UPDATE Well, I feel stupid now, and I apologize to all of you who wasted your time trying to help me. So, here is what happened, my daughter tripped the GFCI breaker in the panel manually, she thought it was a light switch. So, after spending some time yesterday disconnecting everything it dawned on me that in my foolishness I never put the breaker all the way down to reset it. Bahhhh, live and learn. Mind you that I built the whole pool, wiring, plumbing, deck .. everything with my own 2 hands, and then I waste 4 hours of my life on something so stupid.