The 18th Edition BS 7671 now stipulates that protection against transient overvoltages must be provided where the consequences caused by an overvoltage could:
For all other cases, a risk assessment according to regulation 443.5 shall be performed in order to determine if protection against transient overvoltages is require. If the risk assessment is not performed, the electrical installation shall be provided with protection against transient overvoltages.
For a single dwelling unit it will be a decision for the house owner to make whether the consider the small additional cost of the surge protection device justified to protect their installation and equipment against these damaging overvoltages.
At a Glance | Surge Protection
Bitesize Guide | 18th Edition
Hager’s Residential Distribution Catalogue contains all of their 18th edition solutions for residential applications.
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