Nema Locking Blade Configurations by Brandy McNeilin Electrical TablesFebruary 13, 2017 Wiring Voltage 15 AMPERE 20 AMPERE 30 AMPERE Receptacle Plug Receptacle Plug Receptacle Plug 2-Pole 2-Wire 125V L1 L1-15R L1-15P 250V L2 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 480V AC L8 L8-20R L8-20P L8-30R L8-30P 600V AC 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 L1-30P 3Ø 480V L12 L12-20R L12-20P L12-30R L12-30P 3Ø 600V L13 L13-30R L13-30P 3-Pole 40Wire 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