Requirements for Electrical Installations, IET Wiring Regulations, Eighteenth Edition, BS 7671:2018+A2:2022 (Electrical Regulations)

Product Information

Minor changes have been made including reference to prosumers electrical installations and installing fibre optic cables. Part 2 - Definitions Chapter 65, Periodic inspection and testing is reporting on the condition of existing installations. The Wiring Regulations book is published by the IET and the BSI (British Standards Institution), who jointly manage a committee called JPEL/64. This committee is made up of representatives from across the UK electrotechnical industries, and is responsible for developing the Regs. Not only this, but the JPEL/64 committee has an obligation to engage with over-arching European and international committees (CENELEC and IEC), for the advancement of all standards and to support electrotechnical harmonisation across the globe.

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18th Edition changes

For all other cases, protection against transient overvoltages shall be provided unless the owner of the installation declares it is not required due to any loss or damage being tolerable and they accept the risk of damage to equipment and any consequential loss.

There have been some structure changes, including the introduction of a new chapter (chapter 46) and a rework of chapter 53. 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. Minor changes have been made to the model forms and guidance for recipients. These include the addition of fields This section outlines the relevant tests that must be performed on any installation prior to it being energized. The first step to answering a real life problem or any exam question for that matter is to ask yourself. ‘What part of the book does this relate to?’Chapter 13: Fundamental Principles, sets out the criteria for the rest of the book and is a collection of basic rules that all electrical installations, whether commercial, industrial, or domestic should adhere to without going into detail as that is done within Parts 3 to 8 of the book. Flag’ any questions you’re unsure of and re-visit at the end of the exam. Do not leave any questions unanswered. There are also a number of useful considerations to take into account on Periodic Testing & Inspection. The IET’s (Institute of Engineering and Technology) Requirements for Electrical Installations goes by many aliases; the 18th Edition, BS7671:2018, the Big Blue Book, Wiring Regs, or simply the Regs. But regardless of what you call it, one thing is for sure – if you’re involved in the design, installation or maintenance of electric wiring, you’re going to need it. The first two parts are your guide to the book. They provide you with the ‘scope’ of the Regs, explaining what’s included, what the basic principles of electrical installations are, and providing you with definitions of the most commonly used terms within the book.

This section includes changes to automatic disconnection of supply and additional protection. Section 717 - Mobile or transportable units Determining prospective fault current (informative). Measured, calculated or enquiry. Line to line = (L to N) x √3 and between all line conductors = (L to N) x2. Chapter 53: Protection, isolation, switching control and monitoring is the largest chapter in Part 5 and concerns the devices used to turning things off. Whether it’s for overload, fault, fire or overvoltage protection, isolation or just control switching. Plus, the need to monitor parts of the installation when it’s impractical to turn circuits off for safety reasons.

Appendices

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. Regulation 514.12.2, concerning the RCD notice, has been modified and now contains an exception for domestic (household) premises in certain situations.

Section 411 contains a number of significant changes. Some of the main changes are mentioned below.Current carrying capacity and voltage drop for cables (informative). Rating factors for situations and conditions that may affect the current carrying capacities of conductors such as ambient air temperature greater than 30° C (Ca) and cables in groups (Cg). Includes multiple tables for current-carrying capacities and voltage drop for cables with copper or aluminium conductors. Regulation 411.3.1.2 has been redrafted. The regulation now requires that in each consumer’s installation within a building extraneous-conductive parts that are liable to introduce a dangerous potential difference be connected to the main earthing terminal. Appendix 4 includes minor changes concerning a cable surrounded by thermal insulation. Appendix 6 Model forms for certification and reporting Part 4: Protection for safety is where we start getting busy. Five chapters all about ensuring the safety of the users and occupants as well as the building itself.