Code Quiz: Unbonded (Floating Neutral) Generators

Sept. 21, 2017
NEC Guidelines for Unbonded (Floating Neutral) Generators

When is GFCI protection for the 125V, 15A and 20A receptacle outlets mounted on a generator not required for unbonded (floating neutral) portable generators, 15kW or smaller?

A) When the 125V receptacle(s) are interlocked such that they are not available when any 125/250V receptacles are in use
B) When a single ground rod is installed adjacent to the portable generator
C) When two ground rods are installed adjacent to the portable generator
D) Never

Scroll Down to See the Answer

Answer: A

As per Sec. 445.20(A), GFCI protection for the 125V, 15A and 20A receptacle outlets mounted on a generator is not required for unbonded (floating neutral) portable generators 15kW or smaller when the 125V receptacle(s) are interlocked such that they are not available when any 125/250V receptacles are in use.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].

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Steven Owen

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