Definition of Receptacle

The NEC does not provide a specific definition for "duplex receptacle." However, it does define "receptacle" as "a contact device installed at the outlet for the connection of a single attachment plug."

Application of NEC 2017 Section 620.85

NEC 2017 Section 620.85 requires that all 125-volt, 15- and 20-ampere receptacles installed in elevator pits be GFCI-protected unless they are located on the load side of a listed GFCI receptacle or circuit breaker.

Interpretation of Duplex Receptacle

Whether a duplex receptacle is considered a "single receptacle" or not under NEC 2017 Section 620.85 is open to interpretation.

One Argument

One argument is that a duplex receptacle consists of two separate receptacles installed in a single housing. Therefore, it would not be considered a "single receptacle" as defined by the NEC. As such, each receptacle within the duplex receptacle would need to be GFCI-protected, even if the sump pump is connected to only one receptacle.

Another Argument

Another argument is that a duplex receptacle is intended to be used as a single unit, providing power to two different devices. Therefore, it could be considered a "single receptacle" for the purposes of NEC 2017 Section 620.85. As such, only the receptacle that the sump pump is connected to would need to be GFCI-protected.

Recommendation:

In the absence of a clear definition in the NEC, it is recommended to consult with the local electrical inspector for guidance. Ultimately, the inspector will have the final say on whether the duplex receptacle in the elevator pit is required to be GFCI-protected. Flag for review