The last edition of the IET Wiring Regulations, the 18th, was released in July 2018, becoming effective in January 2019, which features some important changes for the protection of electrical and electronic equipment and people around them from damaging overvoltage surges.
The 18th Edition – What Changed?
Surge protection devices that guard against the harmful effects of transient overvoltage will need to be installed in situations which may pose a worse-case threat, including:
- Loss of life or serious injury
- Interruption to public service or commercial activity
- Damage to cultural heritage
- Impact a large populated area
These changes apply to all new electrical system designs and installations and all alterations to existing systems as well, both will need to be fully assessed for protection against transient overvoltage risks and protected as required using the appropriate SPD.