Type TW/THW Wire Specifications Table
| Section (AWG or MCM) | Number of Strands (Nos) | Insulation Thickness (mils) | Approx. Nominal OD (inch) |
|---|---|---|---|
| 14 | Solid or 7 | 30 | 1.03 |
| 12 | Solid or 7 | 30 | 1.17 |
| 10 | Solid or 7 | 30 | 1.36 |
| 8 | 7 or 19 | 45 | 1.82 |
| 6 | 7 or 19 | 60 | 2.36 |
| 4 | 7 or 19 | 60 | 2.72 |
| 3 | 7 or 19 | 60 | 2.87 |
| 2 | 7 or 19 | 60 | 3.19 |
| 1 | 7 or 19 | 80 | 3.81 |
| 1/0 | 19 | 80 | 4.12 |
| 2/0 | 19 | 80 | 4.47 |
| 3/0 | 19 | 80 | 4.88 |
| 4/0 | 19 | 80 | 5.32 |
| 250 | 19 | 95 | 5.93 |
| 300 | 37 | 95 | 6.36 |
| 350 | 37 | 95 | 6.74 |
| 400 | 37 | 95 | 7.10 |
| 450 | 37 | 95 | 7.76 |
| 500 | 37 | 95 | 1.03 |
| 750 | 61 | 110 | 9.44 |