IET Guidance Note 2: Isolation & Switching, 10th Edition (2026)
The IET Guidance Note 2: Isolation & Switching – 18th Edition Amendment 4 is a practical technical reference for UK electricians, electrical inspectors, maintenance engineers and installation professionals working to BS 7671 standards.
Updated to BS 7671:2018+A4:2026, this latest edition provides clear guidance on isolation and switching requirements across modern electrical installations. It covers key topics including isolation of multipole source systems, selection of protective and switching devices, bidirectional and unidirectional devices and Firefighters switches.
Designed for electricians involved in electrical installation, inspection, testing and maintenance work, this IET guidance book helps simplify complex wiring regulation requirements while supporting safe and compliant electrical system design.
Why is Guidance Note 2 useful for electricians and inspectors?
This guide helps electrical professionals correctly apply isolation and switching requirements in line with the latest IET Wiring Regulations. It is especially useful for testing, maintenance, fault finding and safe isolation procedures across commercial and industrial installations.
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1 x IET Guidance Note 2: Isolation & Switching – 18th Edition Amendment 4, 10th Edition
Official IET publication
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