Surge Protection Devices (SPD's)

May 31, 2019

Surge Protection Devices (SPD)



The purpose of a Surge Protection Device (SPD) is to provide protection against over voltage which may occur as a result of a supply fault, internal fault or switching or a lightning strike. 


If an over voltage was to occur there is the potential for serious injury to, or loss of, human life, interruption of supply, damage to electrical equipment and the building fabric.


Regulation 443.4 of The 18th Edition Wiring Regulations (BS7671) requires that protection against transient over voltages is provided where there is a risk of:

  • Serious injury to, or loss of, human life

  • Interruption of public services

  • Damage to cultural heritage

  • Interruption of commercial or industrial activity

  • Where a large number of individuals at the same location could be affected

A risk assessment should be performed to determine if protection against transient over voltage is required, If a risk assessment is not performed, the electrical installation should be provided with suitable protection against transient over voltages by the installation of an SPD.


The only exception to this is given for single dwellings, whilst there is no requirement for the provisions of an SPD to be fitted in a single dwelling there may be some justification to have one installed, particularly if a large volume of electronic devices are present.




Share on Facebook
Share on Twitter
Please reload

Featured Posts

TES Compliance Goes International...!

August 10, 2018

Please reload

Recent Posts

August 29, 2018

Please reload

Please reload

Search By Tags
Follow Us
  • Facebook Basic Square
  • Twitter Basic Square
  • Google+ Basic Square

Tel: 01293 912 318

The Pinnacle, Station Way, Crawley RH101JH

  • Grey LinkedIn Icon
  • Grey Facebook Icon
  • Grey Twitter Icon
  • Grey G+ Icon

© 2018 by TES Compliance Ltd. Company Registration Number 10134836. Registered Address: 4 Harper Drive, Maidenbower, Crawley, West Sussex, RH10 7LD    Powered by Website Services by IT Engine