A neutral makes no difference.
I can't think of a way to detect a symmetrical (balanced) fault.
There is no neutral load at all in the hot tub scenario that spawned this thread.
GFCI is not an OCPD. Even if it were, I can't think of how a GFCI could tell whether the motor is starting or a human grabbed T1 and T2.
[This message has been edited by Dspark (edited 05-09-2001).]
