Additional changes within the second amendment include protection against thermal effects and fire caused by electrical equipment, protection against voltage disturbances and electromagnetic disturbances It would be impossible to cover all of the detail pertained in the book within a summary article. However, please see below a list of key sections and Appendices sub-headings, which should help you to understand what items are broadly available. Sections:

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. This publication has been further updated to include two subsequent amendments to the IET Wiring Regulations as BS 7671:2018+A2:2022.

Regulation 443.4 for determining if protection against transient overvoltages is needed has been redrafted. Regulation 443.4.1 now requires protection against transient overvoltages to be provided where the consequence caused by the overvoltage could result in: Appendix 4 includes minor changes concerning a cable surrounded by thermal insulation. Appendix 6 Model forms for certification and reporting

Regulation 531.3.3 now states that RCD Type AC shall only be used to serve fixed equipment, where it is known Always look to cross-reference information provided with the 18th edition full guide when necessary. Heating conductors and cables Regulations 554.4.2, 554.4.3, and 554.4.4 have been deleted. Chapter 64 - Initial verification Regulation 443.4.2 requires protection against overvoltages to be considered in the case of equipment likely to produce switching overvoltages or disturbances and gives conditions. Regulation Group 643.3 has been redrafted. The requirements for testing insulation resistance where equipment is likely to influence the verification test or be damaged has been clarified and reference is made to a 250 V DC test following the connection of equipment.

IET 18th Edition Wiring Regulations On-Site Guide, 8th Edition: BS7671:2018+A2:2022 Technical Specifications 

As per BS7671:2018 Amendment 2:2022 regulation 722.411.4 a PME (TNCS) earthing facility shall not be used as the means of earthing your EV charge point should the charger or the vehicle on charge be outdoors. There are however several approved methods to still be compliant to the wiring regulations. of negligence or any other cause. Where reference is made to legislation it is not to be considered Changes include the addition of new regulations (relocated from Chapter 53) covering the impact and the installation of heating cables. Chapter 82 - Prosumer’s low-voltage electrical installations Supply through a distributors cut-out having fuse(s) rated at 100A or less to one of either BS 88-2, BS 88-3, BS 88-6 or BS 1361 Type II standards

Regulation 16 Regulations, BS 7671, must comply with all relevant statutory regulations, such as the This section includes changes to automatic disconnection of supply and additional protection. Section 717 - Mobile or transportable units The 2022 publication includes updates to the previous 17th Edition IET Wiring Regulations as well as subsequent amendments (see above) Regulation 443.5 (Risk assessment method) has been deleted and Annex A443 (examples of calculated risk level CRL for use of SPDs) has also been deleted. Section 514 - Identification and notices Guidance Note 3 provides specific advice about the requirements for specification, inspection and testing of electrical installations contained within BS 7671:2018+A2:2022. This can be one of the more confusing parts of the wiring regulations so Guidance Note 3 is intended to clarify any issues.Regulation 544.1.1 concerning main protective bonding conductors has also been revised. Chapter 55 - Other equipment Regulation 514.9.2 has been introduced to advise that all diagrams, charts, and information or instruction notices comply with the applicable standards specified. The IET Wiring Regulations 18th Edition is the comprehensive, detailed guide to electrical installation, design and maintenance in the UK. It contains multiple updates from the 17th Edition which are intended to make electrical installations more effective, safer and more efficient. All regulations are comprehensively detailed and the book constitutes the ultimate reference text for UK electricians.