Surge protective devices (SPDs) are increasingly part of a new or altered consumer unit. When an EV install replaces the board, the designer considers whether surge protection is required or recommended for the installation. Sensitive charger electronics are a poor place to save a small amount. The decision follows the wiring rules and the type of supply, not a gadget advert.
Check surge protection when you install an EV charger before you accept a price
You do not choose a surge device by colour. Ask whether it is included, what type, and what it does not cover. It is not a lightning rod for the whole street.
The price effect of surge protection when you install an EV charger
An SPD in a new board is usually a modest line compared with the board itself. A quote that doubles the price 'because of surges' needs a clearer explanation. A quote that omits it on a full board change also needs a sentence on why.
A miss that shows up later: surge protection when you install an EV charger
The mistake is buying a plug-in surge adapter for the charger lead and thinking the installation is protected. The lead is not the place for that device.
Write surge protection when you install an EV charger into the quote
Ask the certificate pack to list the SPD if one was fitted, and to say if the designer judged it not required.
Surge protection when you install an EV charger
If the quote already includes a new metal board, look for the SPD on the schedule. If the charger is added beside an older board with no SPD, ask whether the designer has considered it rather than assuming it is compulsory in every cottage.
- Board changes are the moment to decide
- SPDs are not plug-in travel adapters
- The designer records the decision
- Charger electronics are not a reason to guess
Frequently asked questions
Does every house need one?
Not automatically. The rules look at the installation and the consequences. A new board is when the question is properly asked.
Will it stop a lightning strike?
It is there to reduce transient overvoltage. It is not a guarantee against a direct strike.
Can I add one later?
Often yes, if the board has a way for it. Doing it with the charger visit is simpler.
Is this the same as open-PEN protection?
No. Surge protection and open-PEN protection solve different problems.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local EV Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.