United States NEMA
General -
Purpose Nonlocking Plugs and Receptacles
Locking Type Plugs and
Receptacles
    15 Ampere 20 Ampere 30 Ampere 50 Ampere 60 Ampere
    Receptacle Plug Receptacle Plug Receptacle Plug Receptacle Plug Receptacle Plug
125V 1 1-15R
 1-15P
                
250V 2   2-15P
 2-20R
 2-20P
 2-30R
 2-30P
        
125V 5 5-15R
 5-15P
 5-20R
 5-20P
 5-20R
 5-30P
 5-50R
 5-50P
    
250V 6 6-15R
 6-15P
 6-20R
 6-20P
 6-30R
 6-30P
 6-50R
 6-50P
    
277V,
A.C.		 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
 14-60R
 14-60P
3Φ
250V		 15 15-15R
 15-15P
 15-20R
 15-20P
 15-30R
 15-30P
 15-50R
 15-50P
 15-60R
 15-60P
3ΦY 125/ 208V 18 18-15R

 18-15P
 18-20R
 18-20P
 18-30R
 18-30P
 18-50R
 18-50P
 18-60R
 18-60P
    15 AMPERE 20 AMPERE 30 AMPERE
    Receptacle Plug Receptacle Plug Receptacle Plug
125V L1 L1-15R L1-15P        
250V L2     L2-20R L2-20P    
125V L5 L5-15R L5-15P L50-20R L50-20P L5-30R L5-30P
250V L6 L6-15R L6-15P L6-20R L6-20P L6-30R L6-30P
277V, A.C. L7 L7-15R L7-15P L7-20R L7-20P L7-30R L7-30P
480V L8     L8-20R L8-20P L8-30R L8-30P
600V L9     L9-20R L9-20P L9-30R L9-30P
25V L14       L14-20