[loupi01]

The bathtub requires 2 20amp circuits. One for the pump and the other for the heater. I am going to install a 2 gang box with 2 gfi receptacles. Can I run 12-3 wire and have the 2 GFI breakers share the same neutral wire?

Thanks for your help

[tkrussell]

No shared neutrals with GFI devices because the neutral current is measured and compared to the current that flows in the hot wire, and trips if there is a difference.

You mention GFI breakers and receptacles, this is not necessary to protect GFI receptacles with a GFI breaker. Use either one or the other, but not both.

If you use standard breakers you can use #12/3 up to the GFI receptacles, then, only 2 wire from each load side to the motor and heater.

Shared neutrals are still allowed, but becoming a thing of the past. If the neutral ever breaks connection, you will apply 240 volts across the 120 volt load, and destroy the appliances.

[loupi01]

I need to better explain:

Using a regular 2 pole breaker from the sub panel I want to run 12-3 wire to the bathtub. I would then use 2 separate GFI receptacles. One for the pump and the other for the heater. That is why I would use a 2 gang box.

Thanks tkrussel for your help

[tkrussell]

Yes that will work, although, like I said , shared neutrals can pose a problem if the neutral is broken at any place and anytime. If you were to hire me, I would be installing two 2 wire cables to feed the GFI receptacles.

[Borewyrm]

Might also consider using faceless GFI's on the wall as opposed to having them below. I do realize, however, that this may add extra work in an "old work" environment.