URD dimensions
Nominal calculation, not one manufacturer's datasheet. The conductor is compact aluminium as Southwire prints it; the walls are the ICEA nominals as Okonite and Southwire reproduce them, the neutral's wires are Prysmian's, and the insulation screen and the jacket are fitted to four makers' diameters, because UL 1072 and ICEA S-94-649 were not read. Check the datasheet before you specify or order.
Each row is one URD 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 URD means, letter by letter.
North American building wire, 600 V (AWG / kcmil) · 18 sizes
| Size | Rating | Insulation mm | Overall diameter mm | Weight (approximate) kg/km |
|---|---|---|---|---|
| 1/0 AWG | 15 kV 100 % | 4.45 | 26.5 | 820 |
| 2/0 AWG | 15 kV 100 % | 4.45 | 27.5 | 950 |
| 4/0 AWG | 15 kV 100 % | 4.45 | 30.9 | 1,350 |
| 500 kcmil | 15 kV 100 % | 4.45 | 37.3 | 1,800 |
| 750 kcmil | 15 kV 100 % | 4.45 | 44.6 | 2,640 |
| 1000 kcmil | 15 kV 100 % | 4.45 | 51.0 | 3,370 |
| 1/0 AWG | 15 kV 133 % | 5.59 | 28.8 | 900 |
| 2/0 AWG | 15 kV 133 % | 5.59 | 29.8 | 1,040 |
| 4/0 AWG | 15 kV 133 % | 5.59 | 33.1 | 1,440 |
| 500 kcmil | 15 kV 133 % | 5.59 | 39.6 | 1,920 |
| 750 kcmil | 15 kV 133 % | 5.59 | 46.9 | 2,780 |
| 1000 kcmil | 15 kV 133 % | 5.59 | 53.3 | 3,530 |
| 1/0 AWG | 25 kV 100 % | 6.60 | 31.3 | 1,000 |
| 2/0 AWG | 25 kV 100 % | 6.60 | 32.3 | 1,150 |
| 4/0 AWG | 25 kV 100 % | 6.60 | 35.7 | 1,560 |
| 500 kcmil | 25 kV 100 % | 6.60 | 43.2 | 2,130 |
| 750 kcmil | 25 kV 100 % | 6.60 | 49.4 | 2,950 |
| 1000 kcmil | 25 kV 100 % | 6.60 | 55.8 | 3,720 |