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The IET’s Wiring Regulations BS 7671, colloquially known as the wiring regs, are a constantly evolving body of work and its latest iteration was launched in April 2026. It contains substantive changes in areas such as batteries, medical environments and power over Ethernet. E+T asked Mark Coles, head of technical regulations at the IET, to both explain the background to the update and summarise the key changes in the latest revision, and what practical changes they will make to the world of the electrical designer, installer and maintainer of electrical installations.
This article also touches on the evolution of the wiring regs and the need for regular revisions to ensure the electrical world is a safe world.
The print version of this article appeared in the May/June issue of E+T.
