Electrical Infrastructure Requirements for EV Charger Installation

Installing an EV charger isn't just about the charger unit itself — it's about the electrical infrastructure that supports it. Getting this right from the start prevents costly rework, ensures safety, and future-proofs your installation for additional chargers down the line.

What Electrical Infrastructure Does an EV Charger Need?

Dedicated circuit: Every EV charger requires its own dedicated electrical circuit — it must not share a circuit with other appliances. This prevents nuisance tripping and ensures the charger can draw its full rated current reliably.

Correctly sized cabling: Cable cross-section must match the charger's rated current. A 7.4kW (32A) charger requires at minimum 6mm² copper cable for typical run lengths. A licensed electrician will calculate the exact requirement based on the cable run length and installation conditions.

RCD protection: A Type A or Type B RCD (Residual Current Device) is mandatory, depending on the charger type. This provides critical protection against electric shock from earth leakage faults.

MCB (circuit breaker): Sized appropriately for the charger's rated current to provide overcurrent protection.

Panel Capacity Check

Before installation, your main distribution board must be assessed to confirm it has sufficient spare capacity. A 7.4kW charger draws 32A — if your main fuse is already near its limit, an upgrade may be required. Greems' site survey includes this assessment as standard.

Future-Proofing Your Installation

If you plan to add more chargers later, it's cost-effective to run additional conduit and spare cable capacity during the initial installation. With Greems managing load across multiple chargers, you can add units incrementally without needing to return to the panel each time.

Want to ensure your electrical infrastructure is right for EV charging? Greems provides professional site assessments. Contact us.