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UL NEMA Standard Plug Designation

General - Purpose Nonlocking Plugs and Receptacles
15 Ampere 20 Ampere 30 Ampere 50 Ampere
R P R P R P R P
125V 1 *
1-15R
*
1-15P
125V 5 *
5-15R
*
5-15P
*
5-20R
*
5-20P
*
5-30R
*
5-30P
250V 6 *
6-15R
*
6-15P
*
6-20R
*
6-20P
*
6-30R
*
6-30P
*
6-50R
*
6-50P
277V 7 *
7-15R
*
7-15P
*
7-20R
*
7-20P
*
7-30R
*
7-30P
*
7-50R
*
7-50P
125/250V 10 *
10-20R
*
10-20P
*
10-30R
*
10-30P
*
10-50R
*
10-50P
3Φ 250V 11 *
11-15R
*
11-15P
*
11-20R
*
11-20P
*
11-30R
*
11-30P
*
11-50R
*
11-50P
125/250V 14 *
14-15R
*
14-15P
*
14-20R
*
14-20P
*
14-30R
*
14-30P
*
14-50R
*
14-50P
3Φ 250V 15 *
15-15R
*
15-15P
*
15-20R
*
15-20P
*
15-30R
*
15-30P
*
15-50R
*
15-50P
Locking Type Plugs and Receptacles
15 Ampere 20 Ampere 30 Ampere 50 Ampere
R P R P R P R P
125V L5 *
L5-15R
*
15-15P
*
L5-20R
*
15-20P
*
L5-30R
*
15-30P
*
L5-50R
*
15-50P
250V L6 *
L6-15R
*
L6-15P
*
L6-20R
*
L6-20P
*
L6-30R
*
L6-30P
*
L6-50R
*
L6-50P
277V L7 *
L7-15R
*
L7-15P
*
L7-20R
*
L7-20P
*
L7-30R
*
L7-30P
*
L7-50R
*
L7-50P
250V L14 *
L14-20R
*
L14-20P
*
L14-30R
*
L14-30P
*
L14-50R
*
L14-50P
250V L15 *
L15-20R
*
L15-20P
*
L15-30R
*
L15-30P
*
L15-50R
*
L15-50P