It is a good idea, and in many US homes it is now required at the service. Beginning with the 2020 edition, the National Electrical Code requires a surge protective device (SPD) for dwelling unit services, so new services and many service replacements include one. A whole-home SPD at the panel protects the charger along with other electronics. Some installers add a second device near the charger on long runs or in lightning-prone areas.
Where Surge Protection Goes
| Location | What it protects |
|---|---|
| Service or main panel (Type 1 or Type 2 SPD) | Whole home, including the EV circuit |
| Subpanel or near charger | Extra protection on long runs |
| Built into charger | Some chargers include internal surge components |
What Surges Can Do
- Damage control boards, communication modules and relays.
- Cause intermittent faults after storms.
- Damage the car’s on-board charger if it is connected during a strike nearby (rare).
Other Good Practice
- Proper earthing and bonding.
- Unplug portable chargers during severe lightning if practical.
- Keep firmware and insurance details up to date.
EVDANCE chargers such as the EVDANCE EV-ACT5006T 48A Level 2 wall charger and EVDANCE EV-AC03201T dual-gun AC charging station include protection against over-voltage and ground faults; a panel SPD adds protection against larger external surges.
Frequently Asked Questions
Does the NEC require surge protection for EV chargers?
The 2020 and later NEC require an SPD for dwelling services, which covers the EV circuit.
Do EV chargers have built-in surge protection?
Many include some internal protection, but a panel SPD adds more.
Should I unplug during thunderstorms?
It is a reasonable precaution for portable chargers.
Related Reading
Key Takeaways
- Surge protection protects charger electronics.
- 2020+ NEC requires SPDs for dwelling services.
- A panel SPD covers the EV circuit; a second device can help on long runs.