A detached garage sub-panel typically uses a 60A feeder, which handles most workshop needs including lighting, outlets, and one large appliance.
| Recommended wire | 6 AWG THHN in conduit, or 6/3 NM-B (55A) where the calculated load is 55A or less (NEC 240.4(B)) |
| Breaker | 60A double-pole |
| Voltage | 240V |
| Typical amperage | 40A |
| Circuit amperage | 60A |
| NEC reference | NEC 225 |
| Max recommended distance | About 185 feet one-way for 3% drop at 40A |
For 100A sub-panels (heavy workshop use), upgrade to 1 AWG copper or 1/0 aluminum, or 3 AWG copper or 1 AWG aluminum with 75°C-rated terminations. Distance is critical — long runs may need upsizing for voltage drop.
6 AWG copper or 4 AWG aluminum for a 60A feeder to a detached garage sub-panel. This supports workshop tools, lighting, and one 240V circuit. If you plan to add an EV charger or large compressor, consider a 100A feeder: 1 AWG copper or 1/0 aluminum, or 3 AWG copper or 1 AWG aluminum with 75°C-rated terminations.
Yes — NEC 250.32 requires a grounding electrode system (ground rod or other electrode) at a detached structure with a sub-panel. The feeder also includes an equipment grounding conductor. The sub-panel has separate neutral and ground bars.
Yes — aluminum is commonly used for feeder runs to detached garages. Use 4 AWG aluminum for a 60A feeder with 75°C terminations (3 AWG at 60°C), or 1/0 AWG aluminum for a 100A feeder. Aluminum connections at the sub-panel must use anti-oxidant compound and listed terminals rated for aluminum conductors.
A 60A sub-panel typically has 6–12 spaces and can support numerous 15A and 20A circuits plus one or two 240V circuits. Typical garage loads: lighting (15A), general outlets (20A), air compressor (20–30A 240V), and an optional EV charger (30–50A).