BS 7671 Appendices

The Appendices provide additional reference material, tables, and guidance to support the main regulations in BS 7671.

Overview of BS 7671 Appendices

Appendix 1 – British Standards Referenced in BS 7671

• Lists **all British Standards** referenced within BS 7671.
• Provides **cross-references to relevant standards for electrical installations**.

Appendix 2 – Statutory Regulations

• Summarizes **legal requirements** affecting electrical installations.
• Includes **Electricity at Work Regulations 1989** and **Building Regulations**.

Appendix 3 – Time/Current Characteristics of Protective Devices

• Provides **graphs and tables** for circuit breakers and fuses.
• Helps determine **correct protective device selection**.

Appendix 4 – Current-Carrying Capacity of Cables

• Lists **cable ratings based on installation conditions**.
• Includes **correction factors for temperature and grouping**.

Appendix 5 – Resistance of Conductors

• Provides **resistance values for different conductor materials**.
• Used for **voltage drop calculations**.

Appendix 6 – Model Forms for Certification and Reporting

• Includes **Electrical Installation Certificates (EICs)**.
• Provides **Periodic Inspection Reports (EICRs)**.

Appendix 7 – Harmonized Cable Core Colours

• Defines **standardized cable colors** for UK electrical installations.
• Ensures **correct identification of conductors**.

Appendix 8 – Current-Carrying Capacity and Voltage Drop

• Provides **guidance on voltage drop limits**.
• Ensures **proper cable sizing for efficiency**.

Appendix 9 – Definitions and Terminology

• Clarifies **technical terms used throughout BS 7671**.
• Ensures **consistent interpretation of regulations**.

Appendix 17 – Energy Efficiency

• Introduced in **Amendment 2**, focusing on **sustainable electrical design**.
• Encourages **energy-efficient installations and smart grid integration**.

Why the Appendices Matter

• Provide **essential reference material for electricians and engineers**.
• Ensure **compliance with technical and legal requirements**.
• Support **accurate calculations and installation decisions**.