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Can a GFCI be used on an isolated power system?

Issue:
Using a GFCI on an Isolated Power System

Product Line:
Hospital Isolated Power Systems

Environment:
NFPA 99, NEC 517.160

Resolution:
GFCI devices should never be connected to an Isolated Power System. GFCIs will not operate properly and can result in unwanted ground connection in the Isolated Power System.