The On-Site Guide is an essential guide to BS 7671. It incorporates the extensive changes in BS 7671:2018, making this a vital guide for keeping up to date. It enables the competent electrician to deal with installations (up to 100 A, 3-phase) providing essential information in a convenient, easy-to-use format.

The 18^th Edition of the IET Wiring Regulations published in July 2018 and came into effect in January 2019. Changes from the previous edition include requirements concerning Surge Protection Devices, Arc Fault Detection Devices and the installation of electric vehicle charging equipment as well as many other areas.