Artfuldodger
Senior Member
Did a little googling on this. Seems if your pump is running on single phase, up to 240v, and on a 20 amp or less breaker, it is supposed to be on a GFCI:
You could infer from this that a three phase motor is not required to be on a GFCI. There is some language about amperage of motor windings, which is over my head, but appears that also if the 3-phase circuit is on a greater than 20 amp breaker, no GFCI is needed.
https://www.ecmag.com/section/codes-standards/necessary-or-not-gfci-protection-swimming-pool-motors
If it's a home more than likely not 3-phase. While it is "suppose" to be on a GFCI, the consensus is some outside things just don't like them. They do their job too well, tripping at the slightest amount of a ground caused by moisture.