I've seen some rather confusing issues with GFCI's on tubs and spas. If the specs say 240v. then it does not require anything but two phase wires and a equipment ground wire. If the specs say 120/240v. than the circuit needs to have a grounded conductor (neutral) and two phase conductors and EGC. If the specs say 240/120v. then spa will require a 3 phase with neutral circuit w/EGC. Yes they have 3 phase equipment out there. The 3 phase equipment is European and they have a GFCI system built in that monitors each of the phases.To my knowledge they do not make a 3 phase GFCI breaker.
As for GFCI breakers, my experience is that the GFCI monitors current going out v. current coming back. All conductors go through the toroid coil, including the neutral, if the breaker has the ability to monitor the neutral the pig tail is connected to the neutral buss and if the breaker is not able to monitor the neutral you won't have a pigtail and this type of breaker would not be suitable for a spa that requires a neutral. However, A breaker that has a pigtail can be used on a "240v. only" spa and nothing needs to be connected to the neutral terminal on the breaker. The pigtail still gets connected to the neutral buss of the panel (not sure on this last point).
What have you found Greg?
Last edited by George Little; 09/19/09 04:54 PM. Reason: Fingers made an error, not my fault.