Guidance Note 3: Inspection & Testing is a fundamental guidance book for all those involved with the testing and inspection of electrical installations. It also contains essential guidance for those studying for inspection and testing qualifications and has been fully updated to BS 7671:2018:2022. BS 7671:2018+A2:2022 incorporates changes from the first amendment, published in 2020, regarding Electric Vehicle Charging Installations to provide greater guidance on embracing changing technology within this sector. Additional changes within the second amendment include protection against thermal effects and fire caused by electrical equipment, protection against voltage disturbances and electromagnetic disturbances, and a new chapter on prosumer's low-voltage electrical installations covering energy efficiency measures, the interface with the smart grid, the management of electricity consumption, the management of renewable sources of electricity, and energy storage.
Cooperating organizations Acknowledgements Preface Introduction Chapter 1: General requirements Chapter 2: Initial verification Chapter 3: Periodic inspection and testing Chapter 4: Test instruments and equipment Chapter 5: Forms Appendix A: Maximum permissible measured earth fault loop impedance (EFLI) Appendix B: Resistance of copper and aluminium conductors Appendix C: Use of an earth leakage current clamp meter to provide an indication of the state of insulation Appendix D: Safety check for diverted neutral currents Index
