Electrical Regulations

Requirements for Electrical Installations, IET Wiring Regulations, Eighteenth Edition, BS 7671:2018+A4:2026

Wed, 14 Jan 2026 14:01:22 GMT

The IET Wiring Regulations is the national standard for electrical installations in domestic, commercial and industrial settings. It is the essential standard for all those concerned with the design, installation, certification and maintenance of electrical installations. Amendment 4:2026 is a major update to BS 7671:2018, The IET Wiring Regulations, Eighteenth Edition.

BS 7671:2018+A4:2026 is a consolidated publication which incorporates all previous amendments to the standard. New inclusions within BS 7671:2018+A4:2026 are: Stationary Secondary Batteries where the purpose is for electrical storage and supply of electrical installations; Functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems; a new section on Power over Ethernet (PoE) and a major revision of Section 710 Medical Locations and the inclusion of a schedule of test results for recording the resistance of supplementary protective equipotential bonding conductors.

From 15th April 2026 you will need to have a copy of BS 7671:2018+A4:2026, known as 'the orange book'.

On-Site Guide (BS 7671:2018+A4:2026), 9th Edition

Wed, 14 Jan 2026 13:53:57 GMT

The On-Site Guide is an essential guide to BS 7671. It incorporates the extensive changes to BS 7671, making this a vital guide for keeping up to date. It enables the competent installer to deal with installations (up to 100 A, 3-phase) providing essential information in a convenient, easy-to-use format. This publication has been further updated to include all four amendments to the 18th Edition and aligns with BS 7671:2018+A4:2026 The IET Wiring Regulations.

BS 7671:2018+A4:2026 incorporates changes from all four amendments to BS 7671:2018 and the On-Site Guide includes new topics, such as bidirectional and unidirectional protective devices; Stationary Secondary Batteries; amended rational for maximum Zs values for protective devices; guidance on selection of RCDs and guidance on prospective fault current for protective devices.

Guidance Note 3: Inspection & Testing, 10th Edition

Wed, 14 Jan 2026 13:29:07 GMT

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+A4:2026, including identification of conductors, Stationary Secondary Batteries, Prosumers Electrical Installations, Recommended initial frequencies of inspection of electrical installations and Maximum permissible measured earth fault loop impedance (EFLI).

Guidance Note 1: Selection & Erection, 10th Edition

Tue, 13 Jan 2026 14:51:27 GMT

Guidance Note 1: Selection & Erection is a fundamental guide for specifiers, installers and those inspecting and testing installations. It contains clear guidance on how to apply the relevant sections of BS 7671 and has been fully updated to BS 7671:2018+A4:2026, including Notices and identification labels required by BS 7671; bidirectional and unidirectional devices; insulation monitoring devices (IMDs); co-ordination between RCD types connected in series; guidance for Protected escape routes; conductor classes; updated guidance for the installation of cables in concealed in a wall or partition; Functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems; Stationary Secondary Batteries; Rating of distribution board with multiple sources with practical examples and Power over Ethernet.

Guidance Note 2: Isolation & Switching, 10th Edition

Wed, 14 Jan 2026 13:26:28 GMT

Guidance Note 2: Isolation & Switching provides clear guidance on what can be a confusing aspect of BS 7671. It is ideal for those working in design, testing and inspection and maintenance and operational aspects and has been fully updated to BS 7671:2018+A4:2026, including isolation of multipole source systems, guidance on the selection of protective, isolation and switching devices; bidirectional and unidirectional devices and Firefighters switches.

Guidance Note 4: Protection Against Fire, 10th Edition

Wed, 14 Jan 2026 13:32:03 GMT

Guidance Note 4: Protection Against Fire is a vital guide to an important safety aspect of working with electricity. It is aimed at everyone involved with fire safety in electrical installations, including consulting engineers, electrical installers, inspectors, maintenance electricians and technicians and has been fully updated to BS 7671:2018+A4:2026, including updates to legislation; guidance on protected escape routes; services between fire compartments and wiring systems for safety services.

Guidance Note 5: Protection Against Electric Shock, 10th Edition

Wed, 14 Jan 2026 13:40:54 GMT

Guidance Note 5: Protection Against Electric Shock provides a core element of safety for specifiers, designers, contractors and inspectors. It includes clear guidance on how to apply the safety requirements of BS 7671 concerning electric shock and has been fully updated to BS 7671:2018+A4:2026, including Power over Ethernet; maximum permissible measured earth fault loop impedance (EFLI), guidance on the verification of site applied insulation.

Guidance Note 6: Protection Against Overcurrent, 10th Edition

Wed, 14 Jan 2026 13:43:11 GMT

Guidance Note 6: Protection Against Overcurrent is a key guide to this important area of BS 7671. It is intended for all involved with specifying, designing, installing or verifying electrical installations and has been fully updated to BS 7671:018+A4:2026, including bidirectional and unidirectional devices; selection of protective devices; back up protection.

Guidance Note 7: Special Locations, 8th Edition

Wed, 14 Jan 2026 13:45:34 GMT

Guidance Note 7: Special Locations provides a comprehensive guide to the various special locations and installations for which additional measures are required to comply with BS 7671. It is designed for anyone working in special locations where guidance may vary, including consulting engineers, electricians, electrical installers, inspectors and technicians and has been fully updated to BS 7671:2018+A4:2026, including guidance on open-PEN detection devices; significant updated guidance for Medical Locations; bidirectional and unidirectional devices; Stationary Secondary Batteries, rating of distribution board with multiple sources; selection of RCDs; Power over Ethernet.

Guidance Note 8: Earthing & Bonding, 6th Edition

Wed, 14 Jan 2026 13:48:59 GMT

Guidance Note 8: Earthing & Bonding provides guidance for all generally applied methods of protection against electric shock in BS 7671 and key information from BS 7430 Code of Practice for Earthing. It covers key guidance for all involved with specifying, designing, installing or verifying electrical installations and has been fully updated to BS 7671:2018+A4:2026, including system types; guidance on functional bonding and protective bonding along with sizing requirements and updates to Highway power supplies and street furniture.

Electrician's Guide to the Building Regulations, 7th Edition

Wed, 14 Jan 2026 13:56:26 GMT

Electrician's Guide to the Building Regulations includes the latest guidance relating to competent person schemes, third-party certification and covers relevant parts of the Building Regulations, including Fire Safety, Ventilation and Conservation of Energy. This guide has been fully updated to BS 7671:2018+A4:2026, including updates to Legislation; protected escape routes; wiring systems where particular risks of fire exist; SPDs for the DC side of Solar PV installations.

Student's Guide to the IET Wiring Regulations, 4th Edition

Wed, 14 Jan 2026 13:59:05 GMT

The Student's Guide to the IET Wiring Regulations is designed for students studying for a career in the electrotechnical industry. The content will enhance the reader's understanding of the IET Wiring Regulations and how to interpret them, as well as integrating with current qualifications being delivered.

The simple format, using diagrams and examples, provides students with guidance to navigate their way through the information available in BS 7671 whilst studying electrical installation courses.

The book provides information on various acts and regulations that students will need to know throughout their studies and into their careers, including easy to understand guidance designed to develop practical abilities and understanding of simple circuits. This publication has been updated to BS 7671:2018+A4:2026 The IET Wiring Regulations.

Electrical Installation Design Guide, 6th Edition

Wed, 14 Jan 2026 13:51:35 GMT

Electrical Installation Design Guide: Calculations for Electricians and Designers provides step-by-step guidance on the design of electrical installations. The guide will be useful to all persons designing electrical installations, also for apprentices and trainees carrying out the calculations necessary for a basic installation and has been fully updated to BS 7671:2018+A4:2026.

Exam Preparation Requirements for Electrical Installations, 2nd Edition

Wed, 03 Sep 2025 14:47:28 GMT

This book is an essential practice aid for the examination required to complete the City & Guilds and EAL Level 3 qualifications, Requirements for Electrical Installations, updated in accordance with BS 7671:2018+A2:2022.

It sets out methods of studying, offers advice on exam preparation, and provides details of the scope and structure of the exam. Learners will also find guidelines and advice about sitting the exam.

This book is an invaluable tool to help learners successfully complete the qualification and includes:

Guidelines and advice about sitting the exam
Practice examinations with 'model' answers
Acting as a revision aid to help students prepare for the full exam
Notes and tips from experienced electrical engineers
References for where to seek further information

Exam Preparation Requirements for Electrical Installations, 2nd Edition (e-book)

Wed, 03 Sep 2025 14:53:32 GMT

This e-book is available through the IET's digital Wiring Regulations platform. Once you have completed your purchase, details of how to download and access your package will be sent to you following your order confirmation. Please note, this may take up to 24 hours.

It sets out methods of studying, offers advice on exam preparation, and provides details of the scope and structure of the exam. Learners will also find guidelines and advice about sitting the exam.

This book is an invaluable tool to help learners successfully complete the qualification and includes:

Guidelines and advice about sitting the exam
Practice examinations with 'model' answers
Acting as a revision aid to help students prepare for the full exam
Notes and tips from experienced electrical engineers
References for where to seek further information

Guide to Temporary Electrical Systems, 2nd Edition

Fri, 27 Sep 2024 08:42:15 GMT

This book provides a detailed explanation of the application of both BS 7671 and BS 7909 to events and other relevant industry guidance. It is a guide for all those involved in the design and use of temporary electrical and power systems, including but not limited to deployment at exhibitions, agricultural shows and outdoors fairs, concerts, theatrical events, film and TV broadcasting, festivals, as well as temporary buildings and structures. It illustrates what should be considered during planning and design, and goes beyond the scope of the regulations on important topics such as stage sets, equipment testing, and considerations for the electrical installations in venues that host temporary events.

This 2nd edition has been revised in alignment with the latest editions of BS 7671:2018+A2:2022 and BS 7909:2023.

Guide to Temporary Electrical Systems, 2nd Edition (e-book)

Fri, 11 Apr 2025 14:32:52 GMT

This 2nd edition has been revised in alignment with the latest editions of BS 7671:2018+A2:2022 and BS 7909:2023.

Open combined protective and neutral (PEN) conductor detection devices (OPDDs)

Fri, 27 Sep 2024 15:09:29 GMT

This Standard (IET 01:2024) includes definitions, requirements and tests for open PEN detection devices (OPDDs). During a protective earth neutral (PEN) fault, hazardous touch-voltages may occur at exposed-conductive-parts, including metallic parts of an electric vehicle (EV), connected to the supply PEN conductor by installation and equipment protective conductors.

IET 01:2024 is primarily intended for use by manufacturers of EV charging equipment and all those involved in the installation of domestic EV charging equipment and associated products, including, but not limited to, manufacturers, designers, installers, developers and operators. It will also be useful to architects, construction firms, facility and estate managers, and anyone investing in, or responsible for, the electrical safety of EV charging equipment and products.

Open combined protective and neutral (PEN) conductor detection devices (OPDDs) (e-book)

Fri, 27 Sep 2024 15:20:29 GMT

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

Tue, 11 Jan 2022 10:12:00 GMT

The IET Wiring Regulations is the national standard for electrical installations in domestic, commercial and industrial settings. It is the essential standard for all those concerned with the design, installation, certification and maintenance of electrical installations. Amendment 2:2022 is a major update to BS 7671:2018, The IET Wiring Regulations, Eighteenth Edition.

BS 7671:2018+A2:2022 incorporates Amendment 1:2020 which brought about new requirements for Electric Vehicle Charging Installations which embraced changing technology within this sector. Additional changes within BS 7671:2018+A2:2022 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.

From 31 July 2024 you will need to have a copy of Amendment 2 (2022) the brown book AND a copy of Amendment 3 (2024) free PDF 'bolt-on' to be up to date with BS 7671. Download your free PDF here.