The IET On-Site Guide, 9th Edition, is a practical reference guide based on BS 7671 Wiring Regulations (18th Edition,
including all amendments up to A4:2026). It is intended for competent electrical installers working on low-voltage
installations up to 100 A, 3-phase systems.
It includes updated technical guidance reflecting the latest amendments, including:
Bidirectional and unidirectional protective devices
Stationary secondary batteries
Revised maximum Zs values for protective devices
Updated RCD selection guidance
Prospective fault current considerations for protection devices
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