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BS 7671:2018 / 18th edition: A Step Ahead For Surge Protection

surge trapFrom 1st January 2019, BS 7671 2018 supposes a big change for the surge protection in the UK.

On one side, the 18th Edition opens the need for installing surge protection in a very broad spectrum from public, commercial or industrial activities too, even, consumer unit applications depending on the circumstances. On a second side, the 18th Edition, (based on the EN 62305-4 and EN 61643-12) describes the selection and the application of surge protection devices too.

Where is surge protection required?
Section 443. Protection against transient overvoltages of atmospheric origin or due to switching states that protection against transient overvoltages shall be provided where the consequence caused by overvoltage could:

• Result in serious injury to, or loss of, human life, or

• Result in interruption of public services and/or damage to cultural heritage or,

• Result in interruption of commercial or industrial activity, or

• Affect a large number of co-located individuals.

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 required. If the risk assessment is not performed, the electrical installation shall be provided with protection against transient overvoltages, except for single dwelling units where the total value of the installation and equipment therein does not justify such protection.

Protection against switching overvoltages shall be considered in case of equipment likely to produce switching overvoltages or disturbances exceeding the values according to the overvoltage category of the installation, e.g. where an LV generator supplies the installation or where inductive or capacitive loads (e.g. motors, transformers, capacitor banks), storage units or high-current loads are installed.

Mersen leading player with innovative solutions in the field of lighting and surge protection offers a comprehensive portfolio of SPDs meeting the requirements regulated in BS 7671, 18th edition, Regulation 433.5.


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