The probability of electronic systems being damaged by lightning is far greater than that of the building itself being struck, as lightning strikes up to 1km away from a building can damage electronics inside it.”
As per BS 7671:2018, there is now a requirement to consider protection from damage caused by transient overvoltages.
Even in domestic settings, the effects of overvoltages can cause costly damage to equipment and fittings. Because of this risk, surge protection is a recommended step in adequately protecting a building and its contents, as the potential cost of replacing damaged installations and equipment far outweighs the cost of installing surge protection.
Given that electronic systems are a vital part of everyday life and have become increasingly miniaturised over the past decades, protecting them from surges is more important than ever. If they were left unprotected and damaged by a transient overvoltage this could result in major inconvenience, lack of service and potentially life-threatening situations.