Can a Arc Fault Breaker be used on a multi wire circuit?

If the multi circuit is using 2 Arc Fault Breakers, do you pigtail the neutral in the panel?

Thanks in advance

A single pole AFCI breaker cannot handle a shared neutral for two circuits. Nor can you use two single pole breakers on a shared neutral.

This is a brief explanation from Square D:



http://ecatalog.squared.com/pubs/Circuit%20Protection/Miniature%20Circuit%20Breakers/Arc%20Fault%20Circuit%20Interrupters%20(AFCI)/0760DB0203R902.pdf

And GE:
http://www.geindustrial.com/products/static/circuitbreakers/arc_fault_circuit_interrupter/AFCI_Combo_Brochure.pdf

If your brand panelboard has a 2 pole AFCI breaker available, then you should be OK. I do not think anyone makes a 2 pole AFCI breaker... yet.

If it is in conduit, you may be able to push or pull in an extra neutral, so each ARC Fault circuit has its own hot and neutral from load side of ARC Fault Breakers.

Cutler-Hammer BR series AFCI breakers are available in two-pole. No others that I know of yet.