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Can breakers with suffix AFI, CAFI, GFI, DF, or EPD be used on a 2 wire, 120V ungrounded system?

Issue:
Is it okay to use the Combination Arc Fault, Ground Fault, Arc Fault, EPD, and Dual Function QO/HOM breakers on older houses with an ungrounded system?

Product Line:
Miniature Circuit Breakers

Resolution:
No, these breakers can only be used on solidly grounded systems.

Schneider Electric Canada

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