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NEMA Plug and Receptacle Configurations

NEMA Configurations

This chart shows the most common NEMA configurations in use in North America for 125ac and 250Vac single phase systems.  This covers most residential applications.

Twist-lock devices have the advantage of locking in the mating position.  This is useful in applications where the connection experiences vibration or the associated cord is hanging or subject to accidental unplugging.

Additional configurations are defined in the ANSI/NEMA WD 6 standard which cover higher voltages, 3 phase applications, and specific purposes such as travel trailers, marine ship-to-shore and more.

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