Level 2 EV chargers (32-48A) are classified as continuous loads, requiring a circuit rated at 125% of the charger's maximum draw.
| Recommended wire | 6/2 with ground or 6 AWG THHN in conduit |
| Breaker | 50A double-pole |
| Voltage | 240V |
| Typical amperage | 40A |
| Circuit amperage | 50A |
| NEC reference | NEC 625 |
| Max recommended distance | About 185 feet one-way for 3% drop at 40A |
A 40A charger needs a 50A circuit (40 × 1.25 = 50). A 48A charger (the maximum for a 60A circuit) needs 6 AWG THHN with 75°C terminations, or 4 AWG NM-B, on a 60A breaker. For future-proofing, many electricians recommend installing a 60A circuit even for a 40A charger.
EV chargers are continuous loads under NEC, so the circuit must be rated at 125% of the charger current. A 48A charger needs a 60A breaker with 6 AWG copper THHN in conduit and 75°C-rated terminations (65A in NEC Table 310.16). 6 AWG NM-B is limited to 55A, so a 48A charger on NM-B needs 4 AWG. A 32A charger needs a 40A breaker with 8 AWG copper.
Most popular home EV chargers output 32A–48A. A 48A EVSE needs a 60A dedicated circuit (6 AWG THHN with 75°C terminations, or 4 AWG NM-B). A 32A EVSE needs a 40A circuit (8 AWG copper). Many homeowners install a 60A circuit to future-proof for higher-amperage chargers.
Yes, but only for a 40A or lower charger. A 50A breaker with 6 AWG copper supports up to 40A continuous (50A × 80% = 40A). For a 48A charger, you need a 60A circuit: 6 AWG THHN with 75°C terminations, or 4 AWG NM-B. Always check the charger's nameplate for the required circuit amperage.
Yes — NEC Article 625 requires Level 2 EV chargers to be on a dedicated branch circuit. No other loads can share the circuit. GFCI protection may be required depending on charger type and installation location.