ARC Fault wiring

[eljefetaco]

I have been out of the residential area for a while. The AHJ is telling me I need to use AF and TR for a remodel I am doing. I don't want to fight him. I ran 12/3 and 14.3 home runs to give my customer extra circuits at no cost to them. Can I use a 2 pole arc fault to properly protect the circuits. I know you cannot with GFCI because of neutral. Any input.

 

[infinity]

Unless this somehow falls under the rehab code the inspector is correct. Do they make a 2 pole AFCI breaker yet?

 

[eljefetaco]

So the times of running a three wire HR are over? Have yet to use AF devices or breakers. I assume they work similiar to GFCI where neutral cannot be shared from panel.

 

[infinity]

So the times of running a three wire HR are over? Have yet to use AF devices or breakers. I assume they work similiar to GFCI where neutral cannot be shared from panel.

Yes they're connected like GFCI breakers so a 2 pole AFCI breaker would work like a 2P GFCI breaker on a MWBC. I have used SP AFCI breakers.

 

[al hildenbrand]

So the times of running a three wire HR are over? Have yet to use AF devices or breakers. I assume they work similar to GFCI where neutral cannot be shared from panel.

Yes they're connected like GFCI breakers so a 2 pole AFCI breaker would work like a 2P GFCI breaker on a MWBC. I have used SP AFCI breakers.

There is one notable exception.

If you can use General Electric's Arc Fault, the newest combination type AFCI that is marked MOD3 is a "next generation" development that does not have the GFCI-like component. The installation instructions show using two single pole AFCIs on a multiwire branch circuit and only connecting the MWBC neutral to one on the AFCIs. The other AFCI gets no load side neutral connection.