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    On Site Guide Amendment 4
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    On-Site Guide | (BS 7671:2018+A4:2026) | Amendment 4 | 9th Edition

    SKU: 9781837240395
    Pre-order dispatch begins week commencing 15 April 2026. *
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    The on site guide amendment 4 is the latest 9th Edition aligned with BS 7671:2018+A4:2026. It provides practical guidance for electricians working on installations up to 100A, incorporating all 18th Edition amendments and essential updates to protective devices, RCD selection and fault current requirements.

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    Description

    On Site Guide Amendment 4

    The On Site Guide Amendment 4 is the latest 9th Edition update aligned with BS 7671:2018+A4:2026, incorporating all four amendments to the 18th Edition of the IET Wiring Regulations. It provides practical, on-the-job guidance for electricians working on installations up to 100A, 3-phase.

    This updated edition reflects key regulatory changes introduced in Amendment 4, ensuring compliance with the most current Wiring Regulations.

    What’s Included in Amendment 4?

    • Guidance on bidirectional and unidirectional protective devices
    • New section covering Stationary Secondary Batteries
    • Updated rationale for maximum Zs values
    • Revised guidance on RCD selection
    • Clarified information on prospective fault current

    Presented in a clear, user-friendly format, the On Site Guide Amendment 4 is an essential reference for electricians, inspectors and contractors who need quick, reliable access to the latest compliance requirements on site.






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    Delivery info
    You’re placing a pre-order for this item. Shipping is scheduled to begin the week commencing 15 April 2026, and we’ll notify you as soon as your order is on its way.