Type NM-B Cable Specifications
| Conductor | Ground Wire | Approx. Cable Dimension (mils) | Approx. Net Weight per 1000' (lbs) | Allowable Ampacity+ | ||||
| Size (AWG) | Number of Conductors | Number of Strands | Insulation Thickness (mils) | Size (AWG) | Number of Strands | |||
| TWO CONDUCTOR | ||||||||
| 14 | 2 | 1 | 19 | 14 | 1 | 360X162 | 57 | 15 |
| 12 | 2 | 1 | 19 | 12 | 1 | 410X179 | 82 | 20 |
| 10 | 2 | 1 | 24 | 10 | 1 | 494X210 | 124 | 30 |
| 8 | 2 | 7 | 35 | 10 | 1 | 612X269 | 186 | 40 |
| 6 | 2 | 7 | 35 | 10 | 1 | 683X304 | 225 | 55 |
| THREE CONDUCTOR | ||||||||
| 14 | 3 | 1 | 19 | 14 | 1 | 307 | 74 | 15 |
| 12 | 3 | 1 | 19 | 12 | 1 | 347 | 107 | 20 |
| 10 | 3 | 1 | 24 | 10 | 1 | 422 | 164 | 30 |
| 8 | 3 | 7 | 35 | 10 | 1 | 565 | 253 | 40 |
| 6 | 3 | 7 | 35 | 10 | 1 | 650 | 357 | 55 |
| 4 | 3 | 7 | 46 | 8 | 1 | 814 | 560 | 70 |
| 2 | 3 | 7 | 46 | 8 | 1 | 952 | 816 | 95 |
| FOUR CONDUCTOR | ||||||||
| 14 | 2/2 | 1* | 19 | 14 | 1 | 336 | 91 | 15 |
| 14 | 4 | 1** | 19 | 14 | 1 | 336 | 91 | 15 |
| 12 | 2/2 | 1* | 19 | 12 | 1 | 381 | 132 | 20 |
| 12 | 4 | 1** | 19 | 12 | 1 | 381 | 132 | 20 |
| 10 | 4 | 1 | 24 | 10 | 1 | 465 | 201 | 30 |