3 phase dorm remodel

[GerryB]

The existing 3-phase wiring is being reused to do this dormitory remodel. Six circuits used to each 2 bedroom, bath and kitchen unit. But alas, only two neutrals:weeping:, two 3 wire circuits. Arc fault devices are planned for the bedrooms, but how can the kitchen arc fault and gfi requirements be accomplished. Do they make 3 phase arc, gfi, or dual breakers?

 

[ActionDave]

Do you at least have conduit for your home runs so you can pull extra neutrals?

 

[winnie]

This old thread might be of interest to you:
http://forums.mikeholt.com/showthread.php?t=175185

I have never used the breakers mentioned in the above thread.

I would guess that if you changed to panels that used the GE breakers, you could use them for the AFCI requirements, and then use GFCI receptacle devices in the kitchen and bath.

There is no way that separate GFCI breakers can function for a MWBC; they need to somehow share the current balance information.

Separate AFCIs can work by separately looking for arc signatures. Of course this means that such an AFCI is not using ground fault detection, and one strong argument against arc fault detection is that most of the real value is in the ground fault detection. But physics, what is practical technologically, and complying with code requirements are 3 separate things.

-Jon