NEMA Connectors

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 (A), with voltage ratings from 125 to 600 volts (V). 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 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”.

There are two basic classifications of NEMA connectors: straight-blade and locking. The metal conductive blades are often informally called “prongs” (as in “3-prong plug”). Numbers prefixed by ‘L’ are curved-blade, twist-locking connectors. Twist-locking types are used for heavy industrial and commercial equipment, where increased protection against accidental disconnection is required.

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. A connector with ground terminal is described as having more wires than poles, e.g. two-pole, three-wire; or four-pole, five-wire; etc. A non-grounding device may be two-pole, two-wire; three-pole, three-wire; etc.

The numerals following the hyphen is the current rating of the device in amperes. This number is followed by the letter ‘R’ to indicate a receptacle or ‘P’ to indicate a plug.

NEMA Plug and Receptacle - Non-locking connectors

DescriptionVoltage15 Ampere20 Ampere30 Ampere50 Ampere60 Ampere
PlugReceptaclePlugReceptaclePlugReceptaclePlugReceptaclePlugReceptacle
2 Poles
2 Wires
125V1-15PNEMA 1-15P1-15RNEMA 1-15R1-20P NEMA 1-20P1-30PNEMA 1-30P
2 Poles
3 Wires
Grounded
125V5-15PNEMA 5-15P5-15RNEMA 5-15R5-20P5-20R5-30P5-30R5-50P5-50R
250V6-15PNEMA 6-15P6-15RNEMA 6-15R6-20PNEMA 6-20P6-20RNEMA 6-20R6-30PNEMA 6-30P6-30RNEMA 6-30R6-50PNEMA 6-50P6-50RNEMA 6-50R
277V,AC7-15PNEMA 7-15P7-15RNEMA 7-15R7-20PNEMA 7-20P7-20RNEMA 7-20R7-30PNEMA 7-30P7-30RNEMA 7-30R7-50PNEMA 7-50P7-50RNEMA 7-50R
347V,AC24-15PNEMA 24-15P24-15RNEMA 24-15R24-20PNEMA 24-20P24-20RNEMA 24-20R24-30PNEMA 24-30P24-30RNEMA 24-30R24-50PNEMA 24-50P24-50RNEMA 24-50R
3 Poles
3 Wires
125/250V10-20PNEMA 10-20P10-20RNEMA 10-20R10-30PNEMA 10-30P10-30RNEMA 10-30R10-50PNEMA 10-50P10-50RNEMA 10-50R
250V11-15PNEMA 11-15P11-15RNEMA 11-15R11-20PNEMA 11-20P11-20RNEMA 11-20R11-30PNEMA 11-30P11-30RNEMA 11-30R11-50PNEMA 11-50P11-50RNEMA 11-50R
3 Poles
4 Wires
Grounded
125/250V14-15PNEMA 14-15P14-15RNEMA 14-15R14-20PNEMA 14-20P14-20RNEMA 14-20R14-30PNEMA 14-30P14-30RNEMA 14-30R14-50PNEMA 14-50P14-50RNEMA 14-50R14-60PNEMA 14-60P14-60RNEMA 14-60R
250V15-15PNEMA 15-15P15-15RNEMA 15-15R15-20PNEMA 15-20P15-20RNEMA 15-20R15-30PNEMA 15-30P15-30RNEMA 15-30R15-50PNEMA 15-50P15-50RNEMA 15-50R15-60PNEMA 15-60P15-60RNEMA 15-60R
Travel Trailer120VTT-30PNEMA TT-30PTT-30RNEMA TT-30R

The alphabet G, W, X, Y, Z in the pictures in this table shows the different line.
G – grouding pole; W – Neutral pole; X, Y, Z – Hot pole.
If in the picture, one pole is not marked by a alphabet, it means a hot pole.
For example, the Grade 6, 6-15P picture,the top round pole marked a G alphabet, it is a gronding pole, and the other 2 poles not marked. They are both hot lines. Grade 6 is hot-hot-ground designed.

NEMA Plug and Receptacle - Twist-locking connectors

DescriptionVoltage15 Ampere20 Ampere30 Ampere50 Ampere60 Ampere
PlugReceptaclePlugReceptaclePlugReceptaclePlugReceptaclePlugReceptacle
2 Poles
3 Wires
Grounded
125VL5-15PNEMA L5-15PL5-15RNEMA L5-15RL5-20PNEMA L5-20PL5-20RNEMA L5-20RL5-30PNEMA L5-30PL5-30RNEMA L5-30RL5-50PNEMA L5-50PL5-50RNEMA L5-50RL5-60PNEMA L5-60PL5-60RNEMA L5-60R
250VL6-15PNEMA L6-15PL6-15RNEMA L6-15RL6-20PNEMA L6-20PL6-20RNEMA L6-20RL6-30PNEMA L6-30PL6-30RNEMA L6-30RL6-50PNEMA L6-50PL6-50RNEMA L6-50RL6-60PNEMA L6-60PL6-60RNEMA L6-60R
277V,ACL7-15PNEMA L7-15PL7-15RNEMA L7-15RL7-20PNEMA L7-20PL7-20RNEMA L7-20RL7-30PNEMA L7-30PL7-30RL7-50PNEMA L7-50PL7-50RNEMA L7-50RL7-60PNEMA L7-60PL7-60RNEMA L7-60R
347V,ACL24-20PNEMA L24-20PL24-20RNEMA L24-20R
480V,ACL8-20PNEMA L8-20PL8-20RNEMA L8-20RL8-30PNEMA L8-30PL8-30RNEMA L8-30RL8-50PNEMA L8-50PL8-50RNEMA L8-50RL8-60PNEMA L8-60PL8-60RNEMA L8-60R
3 Poles
4 Wires
Grounded
125/250VL14-20PNEMA L14-20PL14-20RNEMA L14-20RL14-30PNEMA L14-30PL14-30RNEMA L14-30RL14-50PNEMA L14-50PL14-50RNEMA L14-50RL14-60PNEMA L14-60PL14-60RNEMA L14-60R
250VL15-20PNEMA L15-20PL15-20RNEMA L15-20RL15-30PNEMA L15-30PL15-30RNEMA L15-30RL15-50PL15-50RL15-60PL15-60R
4 Poles
4 Wires
120/280VL18-20PL18-20RL18-30PL18-30R
277/480VL19-20PL19-20RL19-30PL19-30R
347/600VL20-20PL20-20RL20-30PL20-30R
4 Poles
5 Wires
Grounded
120/208VL21-20PL21-20RL21-30PL21-30RL21-50PL21-50RL21-60PL21-60R
277/480VL22-20PL22-20RL22-30PL22-30RL22-50PL22-50RL22-60PL22-60P
347/600VL23-20PL23-20RL23-30PL23-30RL23-50PL23-50RL23-60PL22-60P
Ship To Shore125VSS1-50PSS1-50R
125/250VSS2-50PSS2-50R