IET BS7671:AM4 2026 On-Site Guide

Product Code: IETPWGO184B

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On-Site Guide (BS 7671:2018+A4:2026), 9th Edition

The On-Site Guide is an essential guide to BS 7671. It enables the competent installer to deal with installations (up to 100 A, 3-phase) providing information in a convenient, easy-to-use format. This guide has been updated to include all four amendments to the 18th Edition and aligns with BS 7671:2018+A4:2026 The IET Wiring Regulations.

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This publication is currently set to release on 15th April 2026. Pre-order now to reserve your copy.

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The On-Site Guide is an essential guide to BS 7671. It incorporates the extensive changes to BS 7671, making this a vital guide for keeping up to date. It enables the competent installer to deal with installations (up to 100 A, 3-phase) providing essential information in a convenient, easy-to-use format. This publication has been further updated to include all four amendments to the 18th Edition and aligns with BS 7671:2018+A4:2026 The IET Wiring Regulations.

BS 7671:2018+A4:2026 incorporates changes from all four amendments to BS 7671:2018 and the On-Site Guide includes new topics, such as bidirectional and unidirectional protective devices; Stationary Secondary Batteries; amended rational for maximum Zs values for protective devices; guidance on selection of RCDs and guidance on prospective fault current for protective devices.