Technology Notebook

Electrical Plugs

NEMA Numbers
L = Indicates a locking plug
5 = indicates voltage, where:
1 = 125V, 2-pole, 2-wire
2 = 250V, 2-pole, 2-wire
5 = 125V, 2-pole, 3-wire (Grounded)
6 = 250V, 2-pole, 3-wire (Grounded)
7 = 277V, 2-pole, 3-wire (Grounded)
10 = 125V/250V, 3-pole, 3-wire
11 = 250V, 3-phase, 3-pole, 3-wire
14 = 125V/250V, 3-pole, 4-wire (Grounded)
15 = 250V, 3-phase, 3-pole, 4-wire (Grounded)
18 = 120V/208V, 4-pole, 4-wire (Grounded)
20 = Amperage rating, in this case 20 Amps
R = Mounting configuration, where:
P = Plug (for line cords)
R = Box-mounted receptacle or outlet
C = Connector (for line cords)