[smkie]

This hot requires a sub panel 1 20 amp circuit 120v and a 30 amp 240 the 30 amp is straight 240 so how exactly would a gfci breaker work with no neutral? Thanks

 

[480sparky]

The neutral from the GFCI breaker needs to be landed on the neutral bar. No neutral is needed for a 240v load.... the breaker doesn't care.

 

[smkie]

Yes but why would it need to be gfci how does it monitor the difference in current flow? If the current flow on a neutral is 6milli amps or more the breaker should trip?

 

[chicken steve]

each phase feeds back on the other every 1/2 cycle smkie

they each go through a small CT that senses the negating effects of this balance (same as hot & noodle would do)

if one or the other 'leaks' more than 4-6ma it'll trip it out

~CS~

 

[guest]

A 240 GFCI breaker requires the line side neutral for the internal electronics only. :thumbsup:

 

[SteveBayshore]

There are 120/240 GFCI breakers that require neutral connections and there are 240 GFCI breakers that don't have neutral connections.