NEMA Reference
NEMA Twist Lock Blades
| Voltage | Wires | Poles | T.L. | |
| NEMA 1 | 125 VAC | 2 | 2 | Yes |
| NEMA 2 | 250 VAC | 2 | 2 | Yes |
| NEMA 3 | 277 VAC | 2 | 2 | No |
| NEMA 4 | 600 VAC | 2 | 2 | No |
| NEMA 5 | 125 VAC | 3 | 2 | Yes |
| NEMA 6 | 250 VAC | 3 | 2 | Yes |
| NEMA 7 | 277 VAC | 3 | 2 | Yes |
| NEMA 8 | 480 VAC | 3 | 2 | Yes |
| NEMA 9 | 600 VAC | 3 | 2 | Yes |
| NEMA 10 | 125/250 VAC | 3 | 3 | Yes |
| NEMA 11 | 3Ø∆ 250 VAC | 3 | 3 | Yes |
| NEMA 12 | 3Ø∆ 480 VAC | 3 | 3 | Yes |
| NEMA 13 | 3Ø∆ 600 VAC | 3 | 3 | Yes |
| NEMA 14 | 125/250 VAC | 4 | 3 | Yes |
| NEMA 15 | 3Ø∆ 250 VAC | 4 | 3 | Yes |
| NEMA 16 | 3Ø∆ 480 VAC | 4 | 3 | Yes |
| NEMA 17 | 3Ø∆ 600 VAC | 4 | 3 | Yes |
| NEMA 18 | 3ØY 120/208 VAC | 4 | 4 | Yes |
| NEMA 19 | 3ØY 277/480 VAC | 4 | 4 | Yes |
| NEMA 20 | 3ØY 347/600 VAC | 4 | 4 | Yes |
| NEMA 21 | 3ØY 120/208 VAC | 5 | 4 | Yes |
| NEMA 22 | 3ØY 277/480 VAC | 5 | 4 | Yes |
| NEMA 23 | 3ØY 347/600 VAC | 5 | 4 | Yes |
| NEMA 24 | 347 VAC | 3 | 2 | Yes |
| NEMA 25 | 240 VAC | 3 | 2 | Yes |
| NEMA 26 | 3ØY 240/415 VAC | 5 | 4 | Yes |