Another thing about GFI outlets and this is very important; if the nuetral side has a break, any load to the hot side it automatically pops the GFI. I wired up an outdoor GFI from a breaker box, circuit breaker style GFI, and I used the nueteral from the main box instead of going with the nuetral from the GFI breaker, talk about frustration. Had to consult a master electrician at work about my problem, hooked the nuetral from the breaker and everything worked fine.
Lee F.