IET Guidance Note 6: Protection Against Overcurrent, 10th Edition
 
Guidance Note 6: Protection Against Overcurrent is a key guide to this important area of BS 7671. It is intended for all involved with specifying, designing, installing or verifying electrical installations and has been fully updated to BS 7671:018+A4:2026, including bidirectional and unidirectional devices; selection of protective devices; back up protection.