Wire size for 200 amps by distance (240 V, 3% drop)
| One-way distance | Copper | Drop | Aluminum |
|---|---|---|---|
| 25 ft | 3/0 AWG | 0.32% | 250 kcmil |
| 50 ft | 3/0 AWG | 0.64% | 250 kcmil |
| 75 ft | 3/0 AWG | 0.96% | 250 kcmil |
| 100 ft | 3/0 AWG | 1.28% | 250 kcmil |
| 150 ft | 3/0 AWG | 1.92% | 250 kcmil |
| 200 ft | 3/0 AWG | 2.55% | 250 kcmil |
| 250 ft | 4/0 AWG | 2.53% | 300 kcmil |
| 300 ft | 250 kcmil | 2.57% | 400 kcmil |
Single-phase 240 V, 75°C terminals, non-continuous load. For continuous loads (3+ hours) size for 250 A.
Common 200 A circuits
200 amp circuits typically feed 200 A residential services. The breaker protects the wire, so never pair a 200 A breaker with wire rated below 200 A.
Service entrance conductors
For a 200 A dwelling service (not a subpanel feeder), NEC 310.12 lets the conductors be sized at 83% of the rating, so 2/0 AWG copper or 4/0 AWG aluminum is typical. Feeders to a subpanel use the full 200 A table above.
Frequently asked questions
Can I use 250 kcmil wire on a 200 amp breaker?
Yes. 250 kcmil copper is rated at least 200 A even in the 60°C column, so it works for NM-B cable and THHN alike, as long as voltage drop is acceptable.
How far can I run 3/0 AWG wire at 200 amps?
At 240 V with a 3% voltage-drop limit, about 200 ft one way. Beyond that, go up one size.