The numerals preceding the hyphen encode the number of poles (current-carrying terminals) and wires connected to it, the voltage, and single- or three-phase power.
Twist-locking types are used for heavy industrial and commercial equipment, where increased protection against accidental disconnection is required. Numbers prefixed by 'L' are curved-blade, twist-locking connectors. The metal conductive blades are often informally called "prongs" (as in "3-prong plug"). There are two basic classifications of NEMA connectors: straight-blade and locking.
#Nec residential receptacle requirements pdf images code#
NEMA connectors are named following an alphanumeric code consisting of: prefix "L" (locking types), numerals, a hyphen, numerals, suffix "R" or "P" for "receptacle" or "plug". NEMA receptacles, with their common US uses listed (in purple text)
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 wiring devices are made in current ratings from 15 to 60 amperes (A), with voltage ratings from 125 to 600 volts (V). 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 5-15P plug and NEMA 5-15R receptacle (different scales, blade spacing is 0.5 inches (12.7 mm) for both.) Each receptacle also accepts an ungrounded plug, whether polarized or unpolarized.
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