GFCI Breaker and Neutral Wire

[john2016]

I can't remember off hand. Can you share the neutral when connecting to a GFCI 1P20A breaker? i.e. I'm home running 3 circuits (1,3,5) back to a panel. Can those 3 circuits share the neutral or do I have to run a separate neutral wire for each circuit to connect to each 1P20A GFCI breaker?

 

[ptonsparky]

I can't remember off hand. Can you share the neutral when connecting to a GFCI 1P20A breaker? i.e. I'm home running 3 circuits (1,3,5) back to a panel. Can those 3 circuits share the neutral or do I have to run a separate neutral wire for each circuit to connect to each 1P20A GFCI breaker?

Separate.

 

[kwired]

I can't remember off hand. Can you share the neutral when connecting to a GFCI 1P20A breaker? i.e. I'm home running 3 circuits (1,3,5) back to a panel. Can those 3 circuits share the neutral or do I have to run a separate neutral wire for each circuit to connect to each 1P20A GFCI breaker?

For the GFCI to hold all current that leaves the load side via the ungrounded conductor must return via the grounded (neutral) conductor, plus or minus 4-6 mA.

By "sharing" the neutral of multiple breakers, that current will not be in balance with each individual breaker and you will trip at least two of the three every time there is any load, but with neutral to ground detection features you may trip even without any load.

You need two or three pole GFCI breakers if using for MWBC's, they will have a common CT on all grounded and ungrounded conductors for detecting current not returning via the protected conductors.