Regulation 531.3.3 now states that RCD Type AC shall only be used to serve fixed equipment, where it is known It enables the competent electrician to deal with installations (up to 100 A, 3-phase) providing essential information in a convenient, easy-to-use format. Information on Special Installations & Locations (Part 7 in the 18th edition bs7671) is only mentioned sparingly in this guide. However, some notes are included on the specific sections relating to Bathroom & Shower fittings, as well as advice on underfloor heating installations.

The requirements for RCD testing have been changed and Table 3A (Time/current performance criteria for RCDs) in Appendix 3 has been deleted. Regardless of RCD Type, an alternating current test at rated residual operating current (IMn) is used to verify the effectiveness. Section 702 - Swimming pools and other basins Regulation 514.12 (Notices: periodic inspection and testing) now contains an exception for domestic (household) premises in certain situations. However, in no way should this article be used as a replacement to the larger format guide. This is particularly true if you’re a student of the industry, a relative novice, or revising for a full or update course examination. Understand the different functions of the books, and apply them to the right context.

Guidance Note 3: Inspection & Testing, 9th Edition

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. 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.

The 2022 publication includes updates to the previous 17th Edition IET Wiring Regulations as well as subsequent amendments (see above) Regulation 422.2 now introduces separate requirements for escape routes and a new concept of 'protected escape routes'. Reference to conditions BD2, BD3 and BD4 has been deleted. Chapter 44 - Protection against voltage disturbances and electromagnetic disturbances Regulation 514.9.2 has been introduced to advise that all diagrams, charts, and information or instruction notices comply with the applicable standards specified. Regulation 514.12.2, concerning the RCD notice, has been modified and now contains an exception for domestic (household) premises in certain situations.

Option 3 – Fitting an EV charger without PEN Fault built in but installing an earth rod as means of earth for the charge point only. damage caused by any error or omission in the work, whether such an error or omission is the result Modifications have been made to Regulation Group 543.7 concerning earthing requirements for the installation of equipment having high protective conductor currents. 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.

Content on standard circuits usage, which is not referenced in the main book, is included in Section 7. It should be noted that as the table in this section only offers overview guidance, the numbers used may not provide optimum economical options. Heating conductors and cables Regulations 554.4.2, 554.4.3, and 554.4.4 have been deleted. Chapter 64 - Initial verification

Always look to cross-reference information provided with the 18th edition full guide when necessary. 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 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. rights reserved. Apart from any fair dealing for the purposes of research or private study, or criticism 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: