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Part 3: Assessment of general characteristics. I like to think that Part 3 as all the things you would need to consider if you were designing an electrical installation from scratch. Regulation 514.12 (Notices: periodic inspection and testing) now contains an exception for domestic (household) premises in certain situations. For this section, it is useful to have a decent grasp on the periodic test and inspection sequencing guidelines. Electrical Installation Condition Report
We’ll go into more detail and get you ready to pass your 18 th Edition exam when we go through the book together fully in your 18th Edition online course at the-regs.co.uk. Post-Brexit, this Amendment sees the further adoption of CENELEC Harmonized Documents as the UK continues the inclusion of standards for new and developing technologies.
18th Edition changes
Chapter 82: Prosumer’s low voltage electrical installations provides additional guidance, measures and requirements for the design and installation of user production, storage and or distribution on the public network of electrical energy known as a prosumer’s electrical installation (PEI). Regulation 544.1.1 concerning main protective bonding conductors has also been revised. Chapter 55 - Other equipment This is an entirely new chapter. Historically, utility companies have managed the public transmission and distribution network from the point of view of having central production adapted to demand variation. The objective of this chapter is to provide requirements, such that, low-voltage electrical installations are compatible with the current and future ways to deliver safely the electrical energy to current-using equipment either from the public network or from other local sources.
Additional requirements have been added for installations where the generating set or sets may operate in parallel with other sources including systems for the distribution of electricity to the public. There’s eight Parts including the new Part 8, Functional Requirements and seventeen Appendices, however, Appendices 7 and 12 are empty, leaving just fifteen in this latest version of BS7671. Time/current characteristic of overcurrent protective devices (informative). Maximum loop impedance Zs calculation and maximum measured loop impedance calculation ‘80% rule’. Time/current characteristics graphs for overcurrent protective devices.Regulation 422.1 (precautions where particular risks of fire exist) now introduces requirements for the fire safety design of the building(s) to be documented. Also, requirements have been added where cables should have an improved fire performance.
Regulation 411.3.3 has been redrafted and now has three indents. There is still an exception to omit RCD protection where, other than BA1, BA3 or children (BA2, BA3) and mobile equipment (not exceeding 32 A) for use outdoors, a suitably documented risk assessment determines that RCD protection is not necessary. Chapter 44: Protection against voltage disturbances and electromagnetic disturbances covers the safety of installations from voltage and electro-magnetic disturbances which includes voltage surges due to, earth faults, atmospheric origin, switching and electromagnetic disturbances and undervoltage or loss of voltage. The table below outlines what is covered in the BS 7671 book outlining the IET Requirements for Electrical Installations. It also highlights the number of questions in the exam will target the different sections covered in the book. The ‘Test Value (%)’ column serves to show how much of your time should be spent revising each book section. This is based on the total number of questions covered by each book section out of the 60 that will be asked. Book Part Dan Palmer, Associate Director of Committees at BSI said: “BS 7671 is one of the UK’s most important standards, providing authoritative requirements to promote electrical safety. The changes introduced in this new amendment will help electrical professionals keep up to date with new and innovative technologies, as well as ensuring they have current knowledge about designing safe installations.”
FAQs
There have been some structure changes, including the introduction of a new chapter (chapter 46) and a rework of chapter 53. Section 514 contains a number of significant changes (including illustrations of notices which have been removed and examples are provided in Appendix 11). Some of the main changes are mentioned below. Table 51 has been modified slightly to take into account changes of colour identification for DC and abbreviations have been added.
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