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NEMA connectors are power plugs and receptacles 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 , with voltage ratings from 125 to 600 volts. Different combinations of contact blade widths, shapes, orientations, and dimensions create non-interchangeable connectors that are unique for each combination of voltage, electric current carrying capacity, and grounding system.
NEMA 1-15P and NEMA 5-15P plugs are used on common domestic electrical equipment, and NEMA 5-15R is the standard 15-ampere electric receptacle found in the United States, and under relevant national standards, in Canada , Mexico and Japan.
Other plug and receptacle types are for special purposes or for heavy-duty applications.
The dimensional standard for electrical connectors is ANSI/NEMA WD-6 and is available from the NEMA website.