NEMA Locking Blade Configurations Chart

Voltage   15 Ampere 20 Ampere 30 Ampere
  Receptacle Plug Receptacle Plug Receptacle Plug
 2 Pole 2 Wire
125V L1  L1-15R  L1-15P         
250V L3    L2-20R   L2-20P 
277V AC L3 Reserved For Future Configurations
600V L4 Reserved For Future Configurations
 2 Pole 3 Wire Grounding
125V L5  L5-15R  L5-15P  L5-20R  L5-20P  L5-30R  L5-30P
250V L6  L6-15R  L6-15P  L6-20R  L6-20P  L6-30R  L6-30P
277V AC L7  L7-15R  L7-15P  L7-20R  L7-20P  L7-30R  L7-30P
347V AC L24  L24-20R  L24-20P
480 V AC L8  L8-20R  L8-20P  L8-30R  L8-30P
600 V L9  L9-20R  L9-20P  L9-30R  L9-30P
 3 Pole 3 Wire
125/250V L10      L10-20R  L10-20P  L10-30R  L10-30P
3Ø 250V L11  L11-15R  L11-15P  L11-20R  L11-20P  L11-30R  L11-30P
3Ø 480V L12
   L12-20R  L12-20P  L12-30R  L12-30P
3Ø 600V L13
       L13-30R  L13-30P
 3 pole 4 Wire Grounding
125/250V L14  L14-20R  L14-20P  L14-30R  L14-30P
3Ø 250V L15  L15-20R  L15-20P  L15-30R  L15-30P
3Ø 480V L16
   L16-20R  L16-20P  L16-30R  L16-30P
3Ø 600V L17
   L17-30R  L17-30P
 4 Pole 4 Wire
3ØY
120/208V
L18  L18-20R  L18-20P  L18-30R  L18-30P
3ØY
277/480V
L19
   L19-20R  L19-20P  L19-30R  L19-30P
3ØY
347/600V
L20
   L20-20R  L20-20P  L20-30R  L20-30P
 4 Pole 5 Wire Grounding
3ØY
120/208V
L21
   L21-20R  L21-20P  L21-30R  L21-30P
3ØY
277/480V
L22
   L22-20R  L22-20P  L22-30R  L22-30P
3ØY
347/600V
L23
   L23-20R  L23-20P  L23-30R  L23-30P