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These charts show many of the possible NEMA configurations for different amperages and voltages, from the common wall socket to more rarely seen plugs and receptacles.
Decoding NEMA plugs and receptacles. If you’ve ever had trouble figuring out the NEMA (National Electrical Manufacturers Association) pattern and numbering system on a particular device, you aren’t alone.
As part of the NEMA’s efforts to standardize electrical configurations, the NEMA chart was introduced. This chart is a tabular representation of the different plugs and receptacles according to the NEMA standards, as illustrated below.
NEMA connectors are power plugs and sockets used for AC mains electricity in North America and other countries that use the standards set by the US National Electrical Manufacturers Association. NEMA wiring devices are made in current ratings from 15 to 60 amperes (A), with voltage ratings from 125 to 600 volts (V).
The following chart illustrates the most common NEMA configurations used in North America for 125VAC and 250VAC single phase systems. Note that twist-lock devices lock in the mating position, and use curved blades.
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.
NEMA plug types are standardized configurations of electrical plugs and receptacles used in North America. Understanding the different NEMA plug types can help you choose the right one for your specific needs.
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