1/0 AWG Wire: Ampacity, Uses & Specs | PES Supply
1/0 AWG Wire — Ampacity, Uses & Specifications
1/0 AWG copper wire is rated for 125-150 amps. Used for 150A service entrances, large generators, and commercial applications.
1/0 AWG Wire Specifications
| Specification | Value |
|---|---|
| AWG Size | 1/0 |
| Ampacity (60°C / 140°F) | 125A |
| Ampacity (75°C / 167°F) | 150A |
| Resistance (Ω/1000 ft, Copper) | 0.098 |
| Wire Types Available | THHN, THWN-2, XHHW-2, USE-2, PV Wire, NM-B (Romex), MC Cable |
| Typical Breaker Size | 125A (60°C) or 150A (75°C) |
Common Applications
1/0 AWG copper wire is rated for 125-150 amps. Used for 150A service entrances, large generators, and commercial applications.
Voltage Drop Reference (1/0 AWG Copper, 240V)
| Distance (ft) | VD @ 150A | % Drop | Status |
|---|---|---|---|
| 25 ft | 0.73V | 0.3% | Good |
| 50 ft | 1.47V | 0.6% | Good |
| 100 ft | 2.94V | 1.2% | Good |
| 150 ft | 4.41V | 1.8% | Good |
| 200 ft | 5.88V | 2.5% | Good |
Compatible Breakers and Outlets
For 1/0 AWG wire at 75°C rating (150A), use a 150A double-pole breaker (240V circuits) or 125A single-pole breaker (120V circuits at 60°C rating).
Related Wire Types
- THHN/THWN-2: For conduit runs, rated 90°C dry / 75°C wet
- NM-B (Romex): For indoor residential wiring, rated 60°C
- MC Cable: Metal-clad, for commercial and exposed runs
- USE-2 / PV Wire: For solar and direct burial, rated 90°C
- XHHW-2: For wet/dry locations, rated 90°C