A home EV charger is a continuous, high-current load, so it needs a dedicated circuit with the right cable, breaker and earth-leakage protection. This guide covers the two common single-phase ratings.
| 3.3 kW charger | 7.4 kW charger | |
|---|---|---|
| Approx. current | ~16 A | ~32 A |
| Copper cable | 4 sq mm | 6 sq mm |
| MCB | 20 A | 40 A |
| RCD protection | 30 mA RCCB/RCBO | 30 mA RCBO (Type A) |
| Circuit | Dedicated | Dedicated |
Always use a dedicated circuit with proper earthing and residual-current protection. Size cable for the run with the wire-size calculator, and confirm the install with a licensed electrician.
Guidance only. Figures follow common Indian domestic practice (IS 732 / IS 694), assume copper conductors unless stated, and depend on run length, grouping, ambient temperature and installation. Always have the final design confirmed by a licensed electrician.