IET Guidance Note 6: Protection Against Overcurrent, 10th Edition (2026)
The IET Guidance Note 6: Protection Against Overcurrent – 18th Edition Amendment 4 is a trusted technical reference for UK electricians, electrical designers, inspectors and installation engineers working to the latest BS 7671 regulations.
Updated to BS 7671:2018+A4:2026, this guidance book delivers practical support on overcurrent protection, helping electrical professionals correctly select and apply protective devices across domestic, commercial and industrial installations. It includes updated guidance on bidirectional and unidirectional devices, backup protection and protective device selection to support safe and compliant electrical systems.
Ideal for electricians carrying out installation, inspection and testing work, this IET publication helps improve compliance, reduce risk and support best practice when designing or verifying electrical installations.
Why is Guidance Note 6 useful for electrical installation work?
This guide helps electricians understand how to apply overcurrent protection correctly in line with current IET Wiring Regulations. It is particularly useful for installation design, fault protection and selecting the right protective devices for modern electrical systems.
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1 x IET Guidance Note 6: Protection Against Overcurrent – 18th Edition Amendment 4, 10th Edition
Official IET publication
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