17TH EDITION OSG PDF

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This list is not exhaustive as there are many smaller changes throughout the book not included here. BS Requirements for Electrical Installations will be issued on 2 July and is intended to come into effect on 1 January Installations designed after 31 December will have to comply with BS The Regulations apply to the design, erection and verification of electrical installations, also additions and alterations to existing installations.

Existing installations that have been installed in accordance with earlier editions of the Regulations may not comply with this edition in every respect. This does not necessarily mean that they are unsafe for continued use or require upgrading.

A summary of the main changes is given below this is not an exhaustive list. Part 2 Definitions Definitions have been expanded and modified. Some of the main ones are mentioned below: Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding Regulation The maximum disconnection times stated in Table Regulation There is an exception to omit RCD protection where, other than a dwelling, a documented risk assessment determines that RCD protection is not necessary.

A new Regulation Regulations The regulations concerning IT systems A new Regulation group has been inserted where automatic disconnection according to Regulation Chapter 42 Protection against thermal effects A new Regulation A note has been added stating that cables need to satisfy the requirements of the CPR in respect of their reaction to fire and making reference to Appendix 2, item Requirements have also been included for cables that are supplying safety circuits.

Chapter 44 Protection against voltage disturbances and electromagnetic disturbances Section , which deals with protection against overvoltages of atmospheric origin or due to switching, has been redrafted. The AQ criteria conditions of external influence for lightning for determining if protection against transient overvoltages is needed are no longer included in BS Instead, protection against transient overvoltages has to be provided where the consequence caused by overvoltage see Regulation For all other cases, a risk assessment has to be performed in order to determine if protection against transient overvoltage is required.

There is an exception not to provide protection for single dwelling units in certain situations. Chapter 46 Devices for isolation and switching - A new Chapter 46 has been introduced. This deals with non-automatic local and remote isolation and switching measures for the prevention or removal of dangers associated with electrical installations or electrically powered equipment. Also, switching for the control of circuits or equipment. Where electrically powered equipment is within the scope of BS EN , only the requirements of that standard apply.

Chapter 52 Selection and erection of wiring systems Regulation This is a significant change. This applies throughout the installation and not just in escape routes. Chapter 53 Protection, isolation, switching, control and monitoring This chapter has been completely revised and deals with general requirements for protection, isolation, switching, control and monitoring and with the requirements for selection and erection of the devices provided to fulfil such functions.

Section Devices for protection against overvoltage This section focuses mainly on the requirements for the selection and erection of SPDs for protection against transient overvoltages where required by Section , the BS EN series, or as otherwise stated. Section has been completely revised and the most significant technical change refers to the selection requirements for the voltage protection level.

Chapter 54 Earthing arrangements and protective conductors Two new regulations Two further new regulations These give requirements for the insertion of a switching device in a protective conductor, the latter regulation relating to situations where an installation is supplied from more than one source of energy. Chapter 55 Other equipment Regulation New Regulation Chapters 61, 62 and 63 have been deleted and the content of these chapters now form two new Chapters 64 and Section Construction and demolition site installations This section contains a number of small changes, including requirements for external influences Regulation Section Medical locations This section contains a number of small changes including the removal of Table , and changes to Regulations In addition, a new Regulation Section Extra-low voltage lighting installations This section contains only minor changes including modifications to Regulation Section Electrical installations in caravans and motor caravans This section contains a number of changes including requirements electrical separation, RCDs, proximity to non-electrical services and protective bonding conductors.

Section Electric vehicle charging installations This section contains significant changes to Regulation The exception concerning reasonably practicable has been deleted. Changes have also been made to requirements for external influences, RCDs, socket-outlets and connectors. Section Onshore units of electrical shore connections for inland navigation vessels This is an entirely new section and applies to onshore installations dedicated to the supply of inland navigation vessels for commercial and administrative purposes, berthed in ports and berths.

Most, if not all, of the measures used to reduce the risks in marinas apply equally to electrical shore connections for inland navigation vessels.

One of the major differences between supplies to vessels in a typical marina and electrical shore connections for inland navigation vessels is the size of the supply needed. Section Floor and ceiling heating systems This section has been completely revised.

The scope of Section has been extended to apply to embedded electric heating systems for surface heating. The requirements also apply to electric heating systems for de-icing or frost prevention or similar applications and cover both indoor and outdoor systems. Appendices The following main changes have been made within the appendices Appendix 1 British Standards to which reference is made in the Regulations includes minor changes and additions.

Appendix 6 Model forms for certification and reporting This appendix includes minor changes to the certificates, changes to the inspections for new installation work only for domestic and similar premises with up to A supply, and examples of items requiring inspection for an electrical installation condition report.

Appendix 7 informative Harmonized cable core colours This appendix includes only minor changes. Appendix 8 Current-carrying capacity and voltage drop This appendix includes changes regarding rating factors for current-carrying capacity.

Appendix 14 Determination of prospective fault current The contents of Appendix 14 concerning earth fault loop impedance have been moved into Appendix 3. Appendix 14 now contains information on determination of prospective fault current. Appendix 17 Energy efficiency This is a new appendix that provides recommendations for the design and erection of electrical installations including installations having local production and storage of energy for optimizing the overall efficient use of electricity.

The recommendations within the scope of this appendix apply for new electrical installations and modification of existing electrical installations.

Much of this appendix will not apply to domestic and similar installations.

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Although the IET and BSI are non-governmental organisations and the Wiring Regulations are non-statutory, they are referenced in several UK statutory instruments , and in most cases, for practical purposes, have legal force as the appropriate method of electric wiring. History of BS and predecessor standards[ edit ] The first edition was published in as the "Rules and Regulations for the Prevention of Fire Risks arising from Electric Lighting. Since the 15th edition , these regulations have closely followed the corresponding international standard IEC In , the IEE Wiring Regulations became British Standard BS so that the legal enforcement of their requirements was easier both with regard to the Electricity at Work regulations and from an international point of view. BS has converged towards and is largely based on the European Committee for Electrotechnical Standardization CENELEC harmonisation documents, and therefore is technically very similar to the current wiring regulations of other European countries.

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