NM-B dimensions
Nominal calculation, not one manufacturer's datasheet. The conductors are NEC Chapter 9 Table 8; the insulation, nylon and jacket walls and the ground are the values the makers print, because UL 719 was not read. Five makers' cables of the same name differ by up to 10 % in width: check the datasheet before you specify or order.
Each row is one NM-B size in copper at 600 V: the conductor from NEC Table 8, the walls as the makers catalogue them. Open a row for every layer and its source. What NM-B means, letter by letter.
North American building wire, 600 V (AWG / kcmil) · 12 sizes
| Size | Rating | Insulation mm | Overall diameter mm | Weight (approximate) kg/km |
|---|---|---|---|---|
| 14/2 | 600 V | 0.38 | 8.7 × 4.3 | 90 |
| 12/2 | 600 V | 0.38 | 10.0 × 4.7 | 130 |
| 10/2 | 600 V | 0.51 | 12.1 × 5.5 | 200 |
| 8/2 | 600 V | 0.76 | 15.3 × 7.1 | 290 |
| 6/2 | 600 V | 0.76 | 17.1 × 8.0 | 400 |
| 14/3 | 600 V | 0.38 | 11.3 × 4.3 | 120 |
| 12/3 | 600 V | 0.38 | 13.0 × 4.7 | 180 |
| 10/3 | 600 V | 0.51 | 15.9 × 5.5 | 270 |
| 8/3 | 600 V | 0.76 | 13.8 | 380 |
| 6/3 | 600 V | 0.76 | 15.3 | 540 |
| 4/3 | 600 V | 1.02 | 19.1 | 840 |
| 2/3 | 600 V | 1.02 | 22.2 | 1,220 |