Surge Protection near you

In BS 7671:2018+A2:2022, regulation 443.4.1 requires protection against transient overvoltages where the consequences could cause serious injury to, or loss of, human life, or significant financial or data loss. A reference to failure of safety services also appeared and was removed by the corrigendum issued in May 2023. For all other cases, the position is that protection is provided unless the owner of the installation declares it is not required on the basis that any damage to equipment is acceptable and tolerable. Regulation 443.4.2 adds that protection should be considered where installed equipment produces switching disturbances above the rated impulse voltage in Table 443.2.

Two things were deleted at the same time and their absence explains a lot of confusion. Regulation 443.5, the risk assessment method, and Annex A443, the examples of calculated risk level for the use of SPDs, both went in Amendment 2. Installers who trained under the earlier edition sometimes still talk about running a CRL calculation to decide; that calculation is no longer in the standard.

The selection and installation side lives in Section 534, with Appendix 16 supporting it. The current version of the standard is BS 7671:2018+A4:2026, published and in effect from 15 April 2026, with the previous version withdrawn six months later on 15 October 2026 - so during that transition it is reasonable to ask which edition a design was done to.

They are not competing products; they sit at different points in the chain. A device at the board is what BS 7671 is talking about when it discusses protection of the installation. It sees the incoming supply and protects everything downstream, including the fixed equipment - the boiler, the heat pump controller, the EV charge point, the lighting drivers - that no plug-in strip will ever cover.

A plug-in strip protects what is plugged into it, and only in the sense that it limits what reaches that equipment from the socket it is in. It does nothing for a spike arriving at the other end of a long circuit, nothing for anything hard-wired, and nothing at all if it is quietly worn out, which is the usual state of a strip that has been on a desk for eight years.

The useful way to think about it in a British house is layered. If you are having a consumer unit replaced anyway, the marginal cost of including the board-level device is at its lowest, and the IET's own consumer guidance points out that modern domestic loads such as heat pumps and EV chargers increase the likelihood of transients inside the home rather than only outside it. Local protection at a specific piece of sensitive equipment can then sit on top, which is the Type 3 role.

Transients are brief - far too short to trip a circuit breaker, which is looking for sustained overcurrent, and invisible to a residual current device, which is looking for imbalance. They pass straight through both and arrive at whatever is connected. What they damage is not usually the obvious thing. It is the low-voltage electronics inside something: a control board, a driver, a communications module, a charger.

That is why the aftermath is confusing. An appliance that still runs but has lost its display, a set of downlights where four out of nine stopped working, a boiler that locks out intermittently for months afterwards, a router that keeps dropping. Damage is often cumulative rather than instant, with a component degraded by one event failing weeks later, which makes it nearly impossible to attribute afterwards.

Overhead supplies, rural areas and properties with long external runs to outbuildings are more exposed to lightning-induced events; any property with a lot of switching load is exposed to the man-made kind. Neither means damage is certain. It means the question in regulation 443.4 - what the consequences would be - is a real question with a different answer in different houses.

Surge protective devices absorb energy, and absorbing energy uses them up. A device that has taken a significant event, or a long series of small ones, can reach the end of its useful life while the installation around it carries on working normally. That is why domestic devices carry a status indicator - typically a window or a flag that changes colour - and why the single most useful maintenance habit is looking at it.

Nothing warns you otherwise. There is no alarm, nothing trips, and the house behaves exactly as it did. An expired device is simply not protecting anything, and the first sign is usually damage that the device was fitted to prevent. Build the check into something you already do: look at the indicator when you test the RCD, and have it checked at every condition report.

Replacement is normally a cartridge or module rather than the whole assembly, and it is quick. Ask at installation whether the device is of the replaceable-module type and what the indicator means, because a homeowner who knows what green and red look like on their own board will spot it years before an electrician next opens the cover.

Timing is the biggest variable. Included in a consumer unit replacement that is already happening, it is an incremental item; retrofitted on its own it carries a visit, an isolation, testing and certification of its own. After that the questions are whether the existing board has space or an adjacent enclosure is needed, the device type the design calls for, whether the earthing arrangement can be confirmed, and whether any remedial work comes to light once the cover is off. If a quotation omits surge protection entirely, the useful question is not why it costs extra but which limb of regulation 443.4 the designer thinks applies.

What LokalMatch does is put you in touch with people and nothing more. Describe what you have and what you want, include your postcode, and electricians covering your area reach out to you. Using it costs homeowners nothing, because it is the pros who pay for the requests they get. LokalMatch does not fit surge protection, has no involvement in any price quoted, and does not vet, rank or recommend the businesses that respond.