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 100A, 3-phase, providing essential information in a convenient, easy-to-use format that supports safe, compliant decision making on site.

This publication has been further updated to include the full amendments to the IET Wiring Regulations as BS 7671:2018+A4:2026.