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Can a 2-pole CAFI, GFI or EPD breaker be used to feed (2) 120V single-pole circuits that share a common neutral? (shared neutral)

Issue:
Can a 2-pole CAFI, GFI or EPD breaker be used on (2) 120V circuits with a shared neutral?

Product Line:
Circuit Breakers

Environment:
Applies to 2-pole QO, QOB and HOM circuit breakers with suffix CAFI, GFI or EPD.

Cause:
Two 120V circuits are fed with a multi-wire conductor, consisting of 2 hot wires, 1 neutral wire, and 1 ground wire. The two 120V circuits are sharing the neutral wire.

Resolution:
Yes, 2-pole CAFI, GFI or EPD circuit breakers can be used to feed two single pole 120Vac circuits that share a common neutral.
This situation often occurs when a multi-wire conductor is used to feed the 2 circuits. These may be applied on the following systems:
  • 2p CAFI: Ok for use on a 120/240V system. NOT ok for use on a 208Y/120V system.
  • 2p GFI and 2p EPD: Ok for use on a 120/240V system as well as a 208Y/120V system.
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