EV Charger Installation Safety & RCD Protection

2025 UK Requirements – London EV Chargers

As more drivers switch to electric vehicles, safe EV charger installation has become more important than ever. In 2025, the UK has clear rules for protecting homes and businesses from electrical faults — especially when it comes to RCD protection.

This simplified guide explains what you need to know.

What is RCD protection?

An RCD (Residual Current Device) is a safety device that cuts the power if it detects a fault, helping prevent electric shock and fire.

EV chargers can produce small DC currents that normal RCDs may not detect. That’s why the regulations require special protection.

The 2025 UK requirement

According to BS 7671 (18th Edition Wiring Regulations):

  • Every EV charger must be protected against DC fault currents over 6 mA.
  • This protection can be built inside the charger OR added separately by the installer.
  • The RCD used for EV chargers must normally be 30 mA for personal protection.

Types of RCDs used for EV chargers

Type A RCD

  • Works for AC faults and some DC faults.
  • Can only be used if the charger has built-in 6 mA DC protection.

Type B RCD

  • Detects all AC and DC fault currents.
  • Must be used if the charger does not have built-in DC protection.
  • This is the safest all-round option.

What this means for homeowners

When installing a home EV charger, make sure:

  1. The installer checks if your charger has built-in DC protection.
  2. The correct RCD is fitted (Type A + DC detector OR Type B).
  3. A 30 mA RCD is used for personal safety.
  4. Proper testing is done before the charger is handed over.

What this means for businesses & flats

For car parks, shared charging bays, and commercial sites:

  • Each charge point must have correct RCD protection.
  • Larger installations may require a mix of Type A with DC protection or Type B at the distribution board.
  • Documentation is important for safety checks and grant applications.

Common installation mistakes

  • Assuming every charger has built-in DC protection (many don’t).
  • Installing a Type A RCD without a DC detector.
  • Not testing or recording the RCD performance.

At London EV Chargers, we always confirm the charger specifications and install the correct RCD for full compliance.

Final message

EV charger safety in 2025 is simple:

✔ Protect the circuit
✔ Use the right RCD
✔ Follow BS 7671 rules
✔ Keep records and test properly

This ensures safer homes, safer businesses, and a reliable EV charging experience.