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  1. 1. ONLINE VERSION Building Regulations 2010Published by NBS, part of RIBA Enterprises Ltd, and available from:RIBA Bookshops Mail Order15 Bonhill StreetLondon EC2P 2EATelephone orders/General enquiries: 020 7256 7222Fax orders: 020 7374 2737Email orders: sales@ribabookshops.comOr order online The Building Regulations 2010 P Electrical safety – Dwellings APPROVED DOCUMENT PRIBA BookshopsRIBA, 66 Portland Place, London WIB 1AD. Telephone 020 7256 7222 APPROVED DOCUMENT P1 Design and installation of electrical installationsISBN 978 1 85946 223 2Stock code 57648 Electrical safety – Dwellings© Crown Copyright, 2010Reprint December 2010, with corrections Coming into effect 6 April 2006Copyright in the typographical arrangement rests with the Crown. www.thenbs.comThis publication, excluding logos, may be reproduced free of charge in any formator medium for research, private study or for internal circulation within anorganisation. This is subject to it being reproduced accurately and not used in amisleading context. The material must be acknowledged as Crown copyright andthe title of the publication specified. This document/publication is value added.If you wish to re-use, please apply for a Click-Use Licence for value addedmaterial at, or by writing tothe Office of Public Sector Information, Information Policy Team, Kew, Richmond, onSurrey TW9 4DU. Email: If you require this publication inan alternative format please email 0 iti ts 01 en 2 ed g dm in en rat 06 Cert no. TT-COC-002168 am rpo 20 co in ONLINE VERSION
  2. 2. ONLINE VERSIONMain changes made by the APPROVED DOCUMENTS2010 amendments The following documents have been approved Approved Document K: Protection from falling and issued by the First Secretary of State for the collision and impactThis 2006 edition incorporating 2010 amendments 1998 edition incorporating 2000 and 2010 purpose of providing practical guidance withreflects the changes made as a result of the amendmentsBuilding Regulations 2010 and Building (Approved respect to the requirements of the Buildinginspector etc) Regulations 2010. The changes Regulations 2010. Approved Document L1A: Conservation ofmainly reflect regulation number changes as Approved Document A: Structure fuel and power – New dwellingsa result of re-ordering. There have been no 2004 edition incorporating 2010 amendments 2010 edition incorporating further 2010 amendmentsamendments to the substantive requirements Approved Document L1B: Conservation ofin Schedule 1 (i.e. Parts A to P) of the Building Approved Document B (Fire safety) – Volume 1: Dwellinghouses fuel and power – Existing dwellingsRegulations. 2006 edition incorporating 2010 amendments 2010 edition incorporating further 2010 and 2011Please note the simplification of the definition of amendments‘room for residential purposes’ in regulation 2 of Approved Document B (Fire safety) – Volumethe Building Regulations 2010. Please also note 2: Buildings other than dwellinghouses Approved Document L2A: Conservation ofthat L1(c) has now become regulation 40. 2006 edition incorporating 2007 and 2010 fuel and power – New buildings other than amendments dwellings 2010 edition incorporating further 2010 amendments Approved Document C: Site preparation and resistance to contaminants and moisture Approved Document L2B: Conservation of 2004 edition incorporating 2010 amendments fuel and power – Existing buildings other than dwellings Approved Document D: Toxic substances 2010 edition incorporating further 2010 and 2011 1992 edition incorporating 2002 and 2010 amendments amendments Approved Document M: Access to and use of Approved Document E: Resistance to the buildings passage of sound 2004 edition incorporating 2010 amendments 2003 edition incorporating 2004 and 2010 amendments Approved Document N: Glazing – safety in relation to impact, opening and cleaning Approved Document F: Ventilation 1998 edition incorporating 2000 and 2010 2010 edition incorporating further 2010 amendments amendments Approved Document G: Sanitation, hot water Approved Document P: Electrical safety – safety and water efficiency Dwellings 2010 edition incorporating further 2010 amendments 2006 edition incorporating 2010 amendments Approved Document H: Drainage and waste Approved Document to support regulation 7: disposal Materials and workmanship 2002 edition incorporating 2010 amendments 1999 edition incorporating 2010 amendments Approved Document J: Combustion appliances and fuel storage systems 2010 edition incorporating further 2010 amendments ONLINE VERSION
  3. 3. ONLINE VERSION PContents PAGE PAGEUse of guidance 3 Section 2: Material alterations and material changes of use 13The Approved Documents 3Limitation on requirements 3 Section 3: Information about other legislation 14Materials and workmanship 3 Electricity at Work Regulations 1989 14Mixed use development 4 Electricity Safety, Quality and ContinuityThe Workplace (Health, Safety and Welfare) Regulations 2002 14Regulations 1992 4 Functionality requirements 14The Requirements 5 Appendix A: Examples of electricalSection 0: General guidance 7 installation diagrams 15 Performance 7 Appendix B: Copies of BS 7671 General 7 and IEE model forms 20 Definitions 7 Appendix C: Older practice that can be Other regulations 7 encountered in alteration work 35 Notification of work 7 Appendix D: New harmonised cable identification colours 40Section 1: Design, installation,inspection and testing, and provision Appendix E: Competent personof information 10 self-certification schemes 41 General 10 Standards referred to 42 Design and construction 10 General 10 Other publications referred to 43 Protection against flooding 10 Accessibility 10 Inspection and testing before taking into service 10 General 10 BS 7671 certificates for all electrical work 10 Building Regulations compliance certificates/final notices for notifiable work 11 Certification of notifiable work 11 a. Where the installer is registered with a Part P competent person self-certification scheme 11 b. Where the installer is not registered with a Part P competent person scheme but qualified to complete BS 7671 certificates 11 c. Where installers are not qualified to complete BS 7671 certificates 11 Third party certification 12 Inspection and testing of non-notifiable work 12 Provision of information 12Approved Document P Electrical safety – dwellings ONLINE VERSION 1
  5. 5. ONLINE VERSION PUse of guidanceTHE APPROVED DOCUMENTS LIMITATION ON REQUIREMENTSThis document is one of a series that has been In accordance with regulation 8, the requirementsapproved and issued by the Secretary of State in Parts A to D, F to K, N and P (except forfor the purpose of providing practical guidance paragraphs H2 and J7) of Schedule 1 to thewith respect to the requirements of Schedule 1 Building Regulations do not require anythingto and regulation 7 of the Building Regulations to be done except for the purpose of securing2010 (SI 2010/2214) for England and Wales. reasonable standards of health and safety for persons in or about buildings (and any othersAt the back of this document is a list of all the who may be affected by buildings or mattersdocuments that have been approved and issued connected with buildings). This is one of theby the Secretary of State for this purpose. categories of purpose for which BuildingApproved Documents are intended to provide Regulations may be made.guidance for some of the more common building Paragraphs H2 and J7 are excluded fromsituations. However, there may well be alternative regulation 8 because they deal directly withways of achieving compliance with the prevention of the contamination of water. Parts Erequirements. Thus there is no obligation to and M (which deal, respectively, with resistanceadopt any particular solution contained in an to the passage of sound, and access to and useApproved Document if you prefer to meet the of buildings) are excluded from regulation 8relevant requirement in some other way. because they address the welfare and convenience of building users. Part L is excluded fromSupplementary guidance regulation 8 because it addresses the conservationThe Office of the Deputy Prime Minister of fuel and power. All these matters are amongstoccasionally issues additional material to aid the purposes, other than health and safety, thatinterpretation of the guidance contained in may be addressed by Building Regulations.Approved Documents. This material may beconveyed in official letters to Chief Executives ofLocal Authorities and Approved Inspectors and/ MATERIALS AND WORKMANSHIPor posted on the websites accessed through: Any building work which is subject to the requirements imposed by Schedule 1 to the Building Regulations should, in accordance withOther requirements regulation 7, be carried out with proper materials and in a workmanlike manner.The guidance contained in an Approved Documentrelates only to the particular requirements of the You may show that you have complied withRegulations which the document addresses. The regulation 7 in a number of ways. These includebuilding work will also have to comply with any the appropriate use of a product bearing CEother relevant requirements in Schedule 1 to the marking in accordance with the ConstructionRegulations. Products Directive (89/106/EEC)1, the Low Voltage Directive (73/23/EEC and amendmentThere are Approved Documents which give 93/68/EEC)2 and the EMC Directive (89/336/guidance on each of the Parts of Schedule 1 EEC)3, as amended by the CE marking Directiveand on Regulation 7. (93/68/EEC)4, or a product complying with an appropriate technical specification (as defined in those Directives), a British Standard, or an alternative national technical specification of any state which is a contracting party to the European Economic Area which, in use, is equivalent, or a product covered by a national or European certificate issued by a European Technical Approval issuing body, and the conditions of use are in accordance with the terms of the certificate. You will find further guidance in the Approved Document supporting regulation 7 on materials and workmanship. 1 As implemented by the Construction Products Regulations 1991 (SI 1620/1991). 2 As implemented by the Electrical Equipment (Safety) Regulations 1994 (SI 3260/1994). 3 As implemented by the Electromagnetic Compatibility Regulations 1992 (SI 2372/1992). 4 As implemented by the Construction Products (Amendment) Regulations 1994 (SI 3051/1994) and the Electromagnetic Compatibility (Amendment) Regulations 1994 (SI 3080/1994).Approved Document P Electrical safety – dwellings ONLINE VERSION 3
  6. 6. P USE OF GUIDANCE L I N E ON VERSIONIndependent certification schemes THE WORKPLACE (HEALTH,There are many UK product certification schemes. SAFETY AND WELFARE)Such schemes certify compliance with therequirements of a recognised document which is REGULATIONS 1992appropriate to the purpose for which the material The Workplace (Health, Safety and Welfare)is to be used. Materials which are not so certified Regulations 1992 as amended contain somemay still conform to a relevant standard. requirements which affect building design.Many certification bodies which approve such The main requirements are now covered by theschemes are accredited by UKAS. Building Regulations, but for further information see: Workplace health, safety and welfare:Technical specifications Workplace (Health, Safety and Welfare) Regulations 1992, Approved Code of Practice, L24, HMSO,Under section 1(1) of the Building Act 1984, 1992 (ISBN 0 71760 413 6).Building Regulations may be made for variouspurposes including health, safety, welfare, The Workplace (Health, Safety and Welfare)convenience, conservation of fuel and power and Regulations 1992 apply to the common partsprevention of waste or contamination of water, of flats and similar buildings if people such asfurthering the protection or enhancement of the cleaners and caretakers are employed to workenvironment, facilitating sustainable development in these common parts. Where the requirementsor the prevention and detection of crime. Standards of the Building Regulations that are covered byand technical approvals are relevant guidance to this Part do not apply to buildings other thanthe extent that they relate to these considerations. dwellings, the provisions may still be required inHowever, they may also address other aspects the situations described above in order to satisfyof performance such as serviceability, or aspects the Workplace Regulations.which, although they relate to the purposes listedabove, are not covered by the current Regulations.When an Approved Document makes referenceto a named standard, the relevant version ofthe standard is the one listed at the end of thepublication. However, if this version has beenrevised or updated by the issuing standardsbody, the new version may be used as a sourceof guidance provided it continues to address therelevant requirements of the Regulations.The appropriate use of a product which complieswith a European Technical Approval as defined inthe Construction Products Directive will meet therelevant requirements.The Office intends to issue periodic amendmentsto its Approved Documents to reflect emergingharmonised European Standards. Where a nationalstandard is to be replaced by a Europeanharmonised standard, there will be a co-existenceperiod during which either standard may bereferred to. At the end of the co-existence periodthe national standard will be withdrawn.MIXED USE DEVELOPMENTIn mixed use developments part of a buildingmay be used as a dwelling while another parthas a non-domestic use. In such cases, if therequirements of the Regulations for dwellingsand non-domestic use differ, the requirementsfor non-domestic use should apply in any sharedparts of the building.Electrical safety – dwellings Approved Document P4 ONLINE VERSION
  7. 7. ELECTRICAL SAFETYN L I N E O VERSION PThe RequirementsThis Approved Document took effect on 6 April2006. It deals with the requirements of Part Pof Schedule 1 to the Building Regulations 2010. Requirement Limits on application PART P ELECTRICAL SAFETY Design and installation The requirements of this part apply only to electrical installations that are intended to operate at low or extra-low voltage and are: P1. Reasonable provision shall be made in the design and installation of electrical installations in order to protect persons (a) in or attached to a dwelling; operating, maintaining or altering the installations from fire (b) in the common parts of a building serving one or more or injury. dwellings, but excluding power supplies to lifts; (c) in a building that receives its electricity from a source located within or shared with a dwelling; or (d) in a garden or in or on land associated with a building where the electricity is from a source located within or shared with a dwelling.NOTESExamples of application of Part P Interaction with other Parts of thePart P applies to electrical installations in or Building Regulationsattached to buildings or parts of buildings Other Parts of Schedule 1 to the Buildingcomprising: Regulations contain requirements affecting• dwelling houses and flats; electrical installations. Examples include, but are not limited to:• dwellings and business premises that have a common supply – for example shops and • Part A (Structure): depth of chases in walls, public houses with a flat above; and size of holes and notches in floor and roof joists;• common access areas in blocks of flats such as corridors and staircases; • Part B (Fire safety): fire safety of certain electrical installations; provision of fire alarm• shared amenities of blocks of flats such as and fire detection systems; fire resistance of laundries and gymnasiums. penetrations through floors and walls;Part P applies also to parts of the above • Part C (Site preparation and resistance toelectrical installations: moisture): moisture resistance of cable• in or on land associated with the buildings – penetrations through external walls; for example Part P applies to fixed lighting • Part E (Resistance to the passage of sound): and pond pumps in gardens; penetrations through floors and walls;• in outbuildings such as sheds, detached • Part L (Conservation of fuel and power): garages and greenhouses. energy efficient lighting; reduced current- carrying capacity of cables in insulation;Approved Document P Electrical safety – dwellings ONLINE VERSION 5
  8. 8. P ELECTRICAL SAFETY I N E ONL VERSION• Part M (Access to and use of buildings): height of socket outlets, switches and . consumer units.Further guidance is available in:• the Electrician’s guide to the Building Regulations, published by the IEE (Institution of Electrical Engineers), available from• the Electrical Installers’ Guide to the Building Regulations published by the NICEIC Group Limited and the ECA (Electrical Contractors’ Association), available from or 4(3) states that, on completion ofelectrical installation work, the building (and partsof the electrical installations in the building thatwere not the subject of work) should be no worsein terms of the level of compliance with the otherapplicable Parts of Schedule 1 to the BuildingRegulations than before the work was undertaken.For example, one or more perforations of a ceilinglining beneath a floor – made to accommodaterecessed lighting or similar fittings – may have anadverse effect on that floor’s performance in termsof its resistance to fire and sound penetration. Dueregard should therefore be paid to the guidance inApproved Documents B and E on the performanceof compartment floors.Regulation 4(3) also means that, when extendingor altering an installation, only the new workmust meet current requirements and there is noobligation to upgrade the existing installationunless the new work would adversely affect thesafety of the existing installation, or the state ofthe existing installation was such that the newwork could not be operated safely, or where thereis a requirement to upgrade imposed by theenergy efficiency requirements of the BuildingRegulations.Electrical safety – dwellings Approved Document P6 ONLINE VERSION
  9. 9. ONLINE VERSION PSection 0: General guidancePerformance Kitchen is defined in the Building Regulations as ‘a room or part of a room which contains a sink0.1 In the Secretary of State’s view, the and food preparation facilities’.requirements will be met by adherence to the‘Fundamental Principles’ for achieving safety given As a guide only, in open plan areas the zone ofin BS 7671:2001 Chapter 13. To achieve these a kitchen may be considered to extend fromrequirements electrical installations must be: the edge of the sink to a distance of 3m or to a nearer dividing wall.a. designed and installed to afford appropriate protection against mechanical and thermal Other Regulations damage, and so that they do not present electric shock and fire hazards to people; 0.5 Electrical work is also affected by the Electricity at Work Regulations 1989 as amendedb. suitably inspected and tested to verify that and the Electricity Safety, Quality and Continuity they meet the relevant equipment and Regulations 2002 as amended, as described in installation standards. paragraphs 3.1 to 3.13.General Notification of work0.2 A way of satisfying the fundamentalprinciples would be to follow: When necessary to involve building control bodiesa. the technical rules described in the body of BS 7671:2001 as amended or in an 0.6 Except in the circumstances outlined in equivalent standard approved by a member paragraph 0.7 below, notification of proposals to of the EEA; and carry out electrical installation work must be given to a building control body (the local authority orb. guidance given in installation manuals that an approved inspector) before work begins. are consistent with BS 7671:2001, such as: When not necessary to involve building i. the IEE (Institution of Electrical Engineers) control bodies On-Site Guide; 0.7 It is not necessary to give prior notification ii. the series of IEE Publications, Guidance of proposals to carry out electrical installation Notes Nos 1 to 7. work to building control bodies in the following0.3 The diagrams in Appendix A give an circumstances:indication of the sorts of electrical services a. The proposed installation work is undertakenencountered in dwellings, some of the ways by a person registered with an electrical self-they can be connected and the complexity of certification scheme prescribed in regulationsthe wiring and protective systems necessary (see schedule 3 of the Regulations). In theseto supply them. They are not an indication cases the person is responsible for ensuringof the scope of Part P and must not be used compliance with BS 7671:2001 or anfor installation purposes. equivalent standard and all relevant building regulations requirements. A full list of schemesDefinitions with contact details is given in Appendix E.0.4 The following meanings apply throughout ORthis document: b. The proposed electrical installation work isElectrical installation is defined in the Building non-notifiable work of the type described inRegulations as fixed electrical cables or fixed Table 1 and does not include the provision ofelectrical equipment located on the consumer’s a new circuit (see schedule 4 of theside of the electricity supply meter. Regulations).Extra-low voltage is defined in the BuildingRegulations as voltage not exceeding 50 voltsbetween conductors and earth for alternatingcurrent or 120 volts between conductors fordirect current.Low voltage which normally exceeds extra-lowvoltage is defined in the Building Regulations asnot exceeding 1000 volts between conductors or600 volts between conductors and earth foralternating current; or 1500 volts betweenconductors or 900 volts between conductors andearth for direct current.Approved Document P Electrical safety – dwellings ONLINE VERSION 7
  10. 10. P GENERAL GUIDANCE I N E ONL VERSION Table 1 Work that need not be notified to building control bodies Work consisting of: Replacing any fixed electrical equipment (for example, socket-outlets, control switches and ceiling roses) which does not include the provision of any new fixed cabling Replacing the cable for a single circuit only, where damaged, for example, by fire, rodent or impact (a) Re-fixing or replacing the enclosures of existing installation components (b) Providing mechanical protection to existing fixed installations (c) Installing or upgrading main or supplementary equipotential bonding (d) Work that is not in a kitchen or special location and does not involve a special installation (e) and consists of: Adding lighting points (light fittings and switches) to an existing circuit (f) Adding socket-outlets and fused spurs to an existing ring or radial circuit (f) Work not in a special location, on: Telephone or extra-low voltage wiring and equipment for the purposes of communications, information technology, signalling, control and similar purposes Prefabricated equipment sets and associated flexible leads with integral plug and socket connections Notes: (a) On condition that the replacement cable has the same current-carrying capacity and follows the same route. (b) If the circuit’s protective measures are unaffected. (c) If the circuit’s protective measures and current-carrying capacity of conductors are unaffected by increased thermal insulation. (d) Such work will need to comply with other applicable legislation, such as the Gas Safety (Installation and Use) Regulations. (e) Special locations and installations are listed in Table 2. (f) Only if the existing circuit protective device is suitable and provides protection for the modified circuit, and other relevant safety provisions are satisfactory. Table 2 Special locations and installations(a) Special locations Locations containing a bath tub or shower basin Swimming pools or paddling pools Hot air saunas Special installations Electric floor or ceiling heating systems Outdoor lighting or power installations Solar photovoltaic (PV) power supply systems Small scale generators such as microCHP units Extra-low voltage lighting installations, other than pre-assembled, CE-marked lighting sets Note: (a) See IEE Guidance Note 7 which gives more guidance on achieving safe installations where risks to people are greater.Additional notes c. Consumer unit replacements are, however, notifiable.Tables 1 and 2 above give the general rules fordetermining whether or not electrical installation d. In large bathrooms, the location containingwork is notifiable. The rules are based on the risk a bath or shower is defined by the walls ofof fire and injury and what is practicable. The the bathroom.following notes provide additional guidance and e. Conservatories and attached garages are notspecific examples: special locations. Work in them is thereforea. Notifiable jobs include new circuits back to not notifiable unless it involves the installation the consumer unit, and extensions to circuits of a new circuit or the extension of a circuit in in kitchens and special locations (bathrooms, a kitchen or special location or associated etc) and associated with special installations with a special installation. (garden lighting and power installations, etc). f. Detached garages and sheds are not specialb. Replacement, repair and maintenance jobs locations. Work within them is notifiable only are generally not notifiable, even if carried out if it involves new outdoor wiring. in a kitchen or special location or associated with a special installation.Electrical safety – dwellings Approved Document P8 ONLINE VERSION
  11. 11. GENERAL GUIDANCE L I N E ON VERSION Pg. Outdoor lighting and power installations are special installations. Any new work in, for example, the garden or that involves crossing the garden is notifiable.h. The installation of fixed equipment is within the scope of Part P, even where the final connection is by a 13A plug and socket. However, work is notifiable only if it involves fixed wiring and the installation of a new circuit or the extension of a circuit in a kitchen or special location or associated with a special installation.i. The installation of equipment attached to the outside wall of a house (for example security lighting, air conditioning equipment and radon fans) is not notifiable provided that there are no exposed outdoor connections and the work does not involve the installation of a new circuit or the extension of a circuit in a kitchen or special location or associated with a special installation.j. The installation of a socket outlet on an external wall is notifiable, since the socket- outlet is an outdoor connector that could be connected to cables that cross the garden and requires RCD protection.k. The installation of prefabricated, “modular” systems (for example kitchen lighting systems and armoured garden cabling) linked by plug and socket connectors is not notifiable, provided that products are CE-marked and that any final connections in kitchens and special locations are made to existing connection units or points (possibly a 13A socket outlet).l. Work to connect an electric gate or garage door to an existing isolator is not notifiable, but installation of the circuit up to the isolator is notifiable.m. The fitting and replacement of cookers and electric showers is not notifiable unless a new circuit is needed.n. New central heating control wiring installations are notifiable even where work in kitchens and bathrooms is avoided.Approved Document P Electrical safety – dwellings ONLINE VERSION 9
  12. 12. P ONLINE VERSIONSection 1: Design, installation, inspectionand testing, and provision of informationGeneral BS 7671 installation certificates1.1 Where electrical installation work is to be 1.8 In general, compliance with Part P can becarried out professionally, compliance is necessary demonstrated by the issue of the appropriatewith the Electricity at Work Regulations 1989 as BS 7671 electrical installation certificate.amended. 1.9 Inspection and testing should be carried1.2 In accordance with the Electricity Safety, out to follow the procedures in Chapters 71 andQuality and Continuity Regulations 2002 and the 74 of BS 7671:2001, and a copy of the appropriatecontract for a mains supply, proposals for new installation certificate should be supplied to theinstallations of a mains supply or significant person ordering the work. The electrical installationalterations to an existing mains supply must certificate must be made out and signed only bybe agreed with the electricity distributor. someone “qualified” to do so. Where this is the case, a safety certificate should be issued for allDesign and installation but the simplest of like-for-like replacements. 1.10 “Qualified” in this context means havingGeneral the appropriate qualifications, knowledge and1.3 Electrical installations should be designed experience to carry out the inspection and testingand constructed, suitably enclosed and separated procedures and complete the relevant electricalby appropriate distances to provide mechanical installation certificate.and thermal protection, so that they afford 1.11 The certificate should show that theappropriate protection for persons against the electrical installation work has been:risks of electric shock, burn or fire injuries. a. Inspected appropriately during erection as1.4 A way of complying is to follow the well as on completion to verify that thetechnical rules in BS 7671:2001 as amended components are:or an equivalent standard. i. made in compliance with appropriateProtection against flooding British Standards or harmonised1.5 The Electricity Safety, Quality and Continuity European Standards;Regulations 2002 require the electricity distributor ii. selected and installed in accordance withto install the cut-out and meter in a safe location, BS 7671:2001 (including consideration ofwhere they are mechanically protected and can external influences such as the presencebe safely maintained. In compliance with this of moisture);requirement, the electricity distributor and installermay be required to take into account the risk of iii. not visibly damaged or defective so as toflooding. Some guidance is given in the ODPM be unsafe.publication Preparing for floods, available from b. Tested appropriately to check performance in relation to continuity of conductors, insulation resistance, separationAccessibility of circuits, polarity, earthing and bonding1.6 Wall-mounted socket-outlets, switches arrangements, earth fault loop impedance andand consumer units should be located so that functionality of all protective devices includingthey are easily reachable where this is necessary residual current devices. It is not necessary toto comply with Part M of the Building Regulations. carry out all these tests for each and everyApproved Document M shows ways of complying. installation, only those which are needed toAccessible consumer units should comply with establish whether the installation is safe.BS EN 60439-3. 1.12 Appendix 6 of BS 7671 and Appendix B of this Approved Document contain models of theInspection and testing before various BS 7671 certificates. Qualified installerstaking into service should use the one appropriate to the work they have carried out.General 1.13 BS 7671 does not insist on a Minor Works1.7 Electrical installations should be inspected Certificate being issued for the replacement ofand tested as necessary and appropriate during equipment such as accessories or luminaires, butand at the end of installation, before they are advises that this should be done where appropriatetaken into service, to verify that they are safe to inspection and testing has been carried out,use, maintain and alter and comply with Part P irrespective of the extent of the work undertaken.of the Building Regulations and with any other The Minor Works Certificate is not appropriaterelevant Parts of the Building Regulations. for the replacement of consumer units or similar items, for which the full Electrical Installation Certificate should be used.Electrical safety – dwellings Approved Document P10 ONLINE VERSION
  13. 13. DESIGN, INSTALLATION,L I N E V E R S I O N O N INSPECTION AND TESTING P1.14 Section 712 of BS 7671:2001 provides a b. Where the installer is not registered with alist of all the inspections that may be necessary Part P competent person self-certificationalthough in particular cases only some elements scheme but qualified to complete BS 7671will be relevant. A schedule of inspections forms installation certificatespart of the Electrical Installation Certificate in 1.21 Where notifiable electrical installer workAppendix 6 of BS 7671 and in this Approved is carried out by a person not registered with aDocument at Appendix B. Part P competent person self-certification the1.15 Section 713 of BS 7671:2001 provides work should be notified to a building controla list of all the tests that may be necessary body (the local authority or an approvedalthough, again, in particular cases only some inspector) before work starts. Where the work iselements may be relevant. A blank schedule necessary because of an emergency the buildingfor recording test results also forms part of the control body should be notified as soon asElectrical Installation Certificate. Tests should possible. The building control body becomesbe carried out using appropriate and accurate responsible for making sure the work is safeinstruments under the conditions given in BS and complies with all relevant requirements of7671, and the results compared with the relevant the Building Regulations.performance criteria to confirm compliance. 1.22 Where installers are qualified to carry1.16 The Minor Works Certificate lists six out inspection and testing and completing theessential tests for additions and alterations that appropriate BS 7671 installation certificate, theydo not include the provision of a new circuit. should do so. A copy of the certificate shouldAppropriate tests should be carried out depending then be given to the building control body. Theon the nature of the work. building control body will take this certificate into account in deciding what further action (if any)Building Regulations compliance certificates/ needs to be taken to make sure that the worknotices for notifiable work is safe and complies fully with all relevant1.17 A Building Regulations compliance requirements. Building control bodies may ask forcertificate (issued by Part P competent person evidence that installers are qualified in this case.scheme installers), completion certificates (issued 1.23 Where the building control body decidesby local authorities) and final notices (issued that the work is safe and meets all buildingby approved inspectors) are evidence that regulation requirements it will issue a buildingcompliance with the Building Regulations has regulation completion certificate (the localbeen achieved, and are issued on completion of authority) on request or a final certificate (annotifiable works only. They are different documents approved inspector).than a BS 7671 installation certificate and attestcompliance with all relevant requirements of the c. Where installers are not qualified toBuilding Regulations, not just Part P. complete BS 7671 completion certificates 1.24 Where such installers (who may beCertification of notifiable work contractors or DIYers) carry out notifiable electricala. Where the installer is registered with a Part P work, the building control body must be notified competent person self-certification scheme before the work starts. Where the work is necessary because of an emergency the building control body1.18 Installers registered with a Part P competent should be notified as soon as possible. The buildingperson self-certification scheme are qualified to control body then becomes responsible for makingcomplete BS 7671 installation certificates and sure that the work is safe and complies with allshould do so in respect of every job they undertake. relevant requirements in the Building Regulations.A copy of the certificate should always be given tothe person ordering the electrical installation work. 1.25 The amount of inspection and testing needed is for the building control body to decide,1.19 Where Installers registered with Part P based on the nature and extent of the electricalcompetent person self-certification scheme, a work. For relatively simple notifiable jobs, suchBuilding Regulations compliance certificate must as adding a socket-outlet to a kitchen circuit,be issued to the occupant either by the installer the inspection and testing requirements will beor the installer’s registration body within 30 days minimal. For a house re-wire, a full set of inspectionsof the work being completed. The relevant building and tests may need to be carried out.control body should also receive a copy of theinformation on the certificate within 30 days. 1.26 The building control body may choose to carry out the inspection and testing itself, or to1.20 The Regulations call for the Building contract out some or all of the work to a specialistRegulations compliance certificate to be issued body to carry out the work on its behalf. Whereto the occupier. However, in the case of rented the building control body is a local authority itproperties, the certificate may be sent to the cannot require the building owner to undertake thisperson ordering the work with a copy sent also work. However, under the Building (Local Authorityto the occupant. Charges) Regulations 2010, the authority may charge a higher building control charge when first notified the work or levy a supplementary charge later, based on the recovery of its costs.Approved Document P Electrical safety – dwellings ONLINE VERSION 11
  14. 14. P DESIGN, INSTALLATION, N E V E RAND O N ALLATION, INSPECTION S I TESTING ONLI1.27 A building control body will not issue a 1.34 The information should comprise itemsBS 7671 installation certificate (as these can be called for by BS 7671:2001 or an equivalentissued only by those carrying out the work), but standard and other appropriate informationonly a Building Regulations completion certificate including:(the local authority) or a final certificate (an a. electrical installation certificates describingapproved inspector). the installation and giving details of workThird party certification carried out;1.28 Unregistered installers should not b. permanent labels, for example on earththemselves arrange for a third party to carry connections and bonds, and on items ofout final inspection and testing. The third party – electrical equipment such as consumer unitsnot having supervised the work from the and RCDs;outset – would not be in a position to verify c. operating instructions and log books;that the installation work complied fully withBS 7671:2001 requirements. An electrical d. for unusually large or complex installationsinstallation certificate can be issued only by the only, detailed plans.installer responsible for the installation work.1.29 A third party could only sign a BS 7671:2001Periodic Inspection Report or similar. The Reportwould indicate that electrical safety tests hadbeen carried out on the installation which metBS 7671:2001 criteria, but it could not verify thatthe installation complied fully with BS 7671:2001requirements – for example with regard to routingof hidden cables.Inspection and testing ofnon-notifiable work1.30 Non-notifiable electrical installation workmust also be carried out in accordance with therequirements of BS 7671:2001 or an equivalentstandard. However, it is not necessary for thework to be checked by a building control body oralternatively carried out by an installer registeredwith a Part P competent person self-certificationscheme.1.31 Local authorities, however, can takeenforcement action if non-notifiable work – forexample electrical work which is part of a widerproject – is found to be unsafe and non-compliant.1.32 Those qualified to complete BS 7671installation certificates who carry out non-notifiable work should issue the appropriateelectrical installation certificate for all but thesimplest of like-for-like replacements. DIYers maywish to employ a qualified third party to carry outinspection and testing of non-notifiable work tomake sure it is safe. The qualified person neednot necessarily be registered with a Part Pcompetent person scheme self-certificationscheme but, as required by BS 7671, must bequalified in respect of the inspection and testingof an installation.Provision of information1.33 Sufficient information should be left withthe occupant to ensure that persons wishing tooperate, maintain or alter an electrical installationcan do so with reasonable safety.Electrical safety – dwellings Approved Document P12 ONLINE VERSION
  15. 15. ONLINE VERSION PSection 2: Extensions, material alterationsand material changes of use2.1 Where any electrical installation work isclassified as an extension, a material alterationor a material change of use, the addition andalteration work must include:a. such works on the existing fixed electrical installation in the building as are necessary to enable the additions and alterations, the circuits which feed them, the protective measures and the relevant earthing and bonding systems to meet the requirements; andb. establishing that the mains supply equipment is suitable.2.2 A way of complying would be to followfor the new work the guidance given above inSection 1 in relation to design, construction andinspection and testing and to show that for thealtered circumstances:a. the rating and the condition of the existing equipment belonging to both the consumer and to the electricity distributor: i. can carry the additional loads being allowed for, or ii. are improved so that they can carry the additional loads being allowed for; andb. the correct protective measures are used; andc. the earthing and equipotential bonding arrangements are satisfactory.2.3 In accordance with Regulation 4(3), thewhole of the existing installation does not needto be upgraded to current standards, but only tothe extent necessary for the new work to meetcurrent standards except where upgrading isrequired by the energy efficiency requirementsof the Building Regulations.2.4 Appendix C offers guidance on some ofthe types of older installations that might beencountered in alteration work.2.5 Appendix D offers guidance on applyingthe harmonised European cable identificationsystem when making additions and alterationsto existing installations.Approved Document P Electrical safety – dwellings ONLINE VERSION 13
  16. 16. P ONLINE VERSIONSection 3: Information about other legislationElectricity at Work Regulations 1989 for safety reasons), to maintain the supply within defined tolerance limits and to provide certain3.1 All electrical installations must be technical and safety information to consumersaccommodated in ways that meet the requirements to enable them to design their installations.of the Building Regulations. However electricalinstallations carried out by persons on whom 3.9 Distributors and meter operators mustduties are imposed by the Electricity at Work ensure that their equipment on consumers’Regulations 1989 must meet the requirements premises is suitable for its purpose and safe inof those Regulations. its particular environment and that the polarity of conductors is clearly indicated.3.2 The advice given below reflects the presentstate of the Electricity at Work Regulations 1989 3.10 The Regulations allow the Secretary offollowing amendments by Statutory Instruments State to issue safety enforcement notices to1996/192, 1997/1993 and 1999/2024. consumers in circumstances where consumers’ installations outside buildings present a danger3.3 Regulation 3 imposes duties on employers, to the public.employees and the self-employed. Regulation3(2)(b) places duties on employees equivalent to 3.11 In relation to ‘embedded’ generation5, thethose placed on employers and self-employed Regulations require persons operating ‘switchedpersons where there are matters within their control. alternative’ sources of energy in their installations to prevent a parallel connection occurring with3.4 The text of the Electricity at Work Regulations the distributor’s network and to comply with BSand guidance on how to comply with them are 7671. Sources of energy that operate in parallelcontained in the Health and Safety guidance with the distributor’s network must meet certaindocument ‘Memorandum of Guidance on the additional safety standards: for example theElectricity at Work Regulations 1989 – HSR25’. equipment must not be a source of danger orImportant elements of the Regulations include: cause interference with the distributor’s network.a. The Electricity at Work Regulations require Persons installing domestic combined heat and that electrical work is only carried out by power equipment must advise the local distributor persons that are competent to prevent of their intentions before or at the time of danger and injury while doing it, or who are commissioning the source. appropriately supervised (Regulation 16). 3.12 Distributors are prevented by the Regulationsb. The Electricity at Work Regulations set general from connecting installations to their networks requirements for the design, construction and which do not comply with BS 7671. Other persons suitability of equipment for its intended use may connect installations to distributors’ networks (Regulations 4(1), 5, 6, 7, 8, 9, 10, 11, 12). provided they obtain the prior consent of the distributor, who may require evidence that theElectricity Safety, Quality and installation complies with BS 7671 and that the connection itself will meet safety and operationalContinuity Regulations 2002 requirements. Distributors may disconnect3.5 The Electricity Safety, Quality and Continuity consumers’ installations which are a source ofRegulations 2002 (SI 2002/2665) came into danger or cause interference with their networksforce on 31 January 2003. These Regulations or other installations.replaced the Electricity Supply Regulations 1988 3.13 Detailed Guidance on the Regulations is(as amended). available at The Regulations specify safety standardswhich are aimed at protecting the general public Functionality requirementsfrom danger. In addition, the Regulations specify 3.14 Part P of the Building Regulations makespower quality and supply continuity requirements requirements covering the safety of fixed electricalto ensure an efficient and economic electricity installations, but does not cover system service for consumers.The Regulations The functionality of electrically powered systemswere introduced to improve standards in public such as fire alarm systems, fans and pumps issafety and to align requirements to modern covered in other Parts of the Building Regulationselectricity markets. and other legislation.3.7 The duty holders are generators, distributors,suppliers, meter operators, consumers andspecified persons. Most of the duties apply todistributors who own or operate networks usedto supply consumers’ installations, street furnitureor other networks.3.8 Amongst other duties, distributors are 5 ‘Embedded’ generators are those connected to the distribution networks required to provide an earthing facility for new of public electricity suppliers rather than directly to the National Grid. connections (unless this would be inappropriate Most CHP and renewable generating stations are embedded.Electrical safety – dwellings Approved Document P14 ONLINE VERSION
  17. 17. ONLINE VERSION PAppendix A: Examples of electricalinstallation diagramsNotes d. Types of wiring or wiring system. While PVC insulated and sheathed cables are1. The diagrams do not give all the information likely to be suitable for much of the wiringneeded to achieve compliance with BS 7671, nor in a typical dwelling, other types of cabledo they cover all the electrical services found in may also be necessary. For example,dwellings, some of which (e.g. swimming pools heat-resisting flexible cables are required forand saunas) are subject to special requirements the final connections to certain equipment;specified in Part 6 of BS 7671:2001. The diagrams the cable to the garage or shed, if runmust not be used for installation purposes. underground, is subject to certain2. The diagrams are simplified examples of what requirements; and cables concealed inmay be encountered. They are not a substitute floors and walls in certain circumstancesfor the proper consideration of for instance: are required to have an earthed metal covering, be enclosed in steel conduit a. Cross-sectional areas (csa) of the phase or have additional mechanical protection. and neutral conductors of circuits. The minimum csa required by BS 7671 depends e. Principles of cable routing. BS 7671 contains on a number of variables, including: type criteria for the routing and positioning of of cable, number of cores, type and cables, so as to give protection against nominal current of overcurrent protective electric shock and fire as a result of device, grouping with other circuits, mechanical damage to a cable. For example, ambient temperature, contact with thermally such criteria are given for cables concealed insulating materials and circuit length. in walls or buried in the ground. b. Cross-sectional areas of protective f. Current ratings of circuits to fixed conductors. BS 7671 contains different current-using equipment such as a rules, involving a number of variables, for shower or cooker. determining the minimum csa for each In the above context, diagrams are given as type of protective conductor, including follows: the earthing conductor, circuit protective conductors, main equipotential bonding Diagram 1(a) indicates the many electrical conductors and supplementary bonding appliances that can be found in the home and conductors. how they might be supplied. c. Types and nominal current ratings of Diagram 1(b) indicates earthing and bonding fuses or circuit breakers. These particulars arrangements that can be necessary. depend on the circuit design current Diagram 2(a) indicates earthing arrangements as and load characteristics, and need to be might be provided by electricity distributors. co-ordinated with the circuit conductors and with the earth fault loop impedance Diagram 2(b) indicates the earthing arrangement of the circuit. as might need to be provided by the consumer. Key to diagramsApproved Document P Electrical safety – dwellings ONLINE VERSION 15
  18. 18. P EXAMPLES OF O N L I N E VALLATIONO N INST E R S I ELECTRICAL INSTALLATION DIAGRAMS Diagram 1(a) Illustration of the fixed electrical installation that might be commonly encountered in new or upgraded existing dwellingsNotes:1. See the general rules in BS 7671:2001.2. The RCD component in the main switch is required for TT systems (see Diagram 2(b)). Individual circuit 30mA RCDs may be required to avoid unnecessary tripping.3. The notices include advice on periodic testing and regular test operation of the RCDs.4. The zone shown around the bath or shower corresponds to zone 3 in Section 601 of BS 7671:2001. The socket-outlet shown in the bedroom with the shower cubicle must be outside zone 3.Electrical safety – dwellings Approved Document P16 ONLINE VERSION
  19. 19. EXAMPLES OF ELECTRICALN E V E R S I O N O N L I INSTALLATION DIAGRAMS P Diagram 1(b) Illustration of earthing and bonding conductors that might be part of the electrical installation shown in Diagram 1(a)Notes:1. See the general rules in BS 7671:2001.2. Circuit protective conductors are taken to all items of fixed electrical equipment and local isolation and switching devices which appear in Diagram 1(a).3. In the case of a protective multiple earthing (PME) supply (see Diagram 2(a)), consult the electricity distributor.4. Supplementary bonding is required in bathrooms to an extent dependent upon the presence of metallic fixtures, fittings and pipework: see Section 601 of BS 7671:2001.Approved Document P Electrical safety – dwellings ONLINE VERSION 17
  20. 20. P EXAMPLES OF O N L I N E VALLATIONO N INST E R S I ELECTRICAL INSTALLATION DIAGRAMS Diagram 2(a) Example earthing arrangement where the electricity distributor provides the earth connection (referred to as TN-C-S where the connection is made to A, or TN-S where the connection is made to B – the most common systems in urban areas)Notes:1. Connection A shows the arrangement where an electricity distributor provides a combined protective earthing and neutral conductor as part of a protective multiple earthing system (referred to as TN-C-S). Connection B shows the arrangement where an electricity distributor provides a protective earthing conductor (usually the metallic covering of the supply cable) that is separate from the neutral conductor (as part of a system referred to as TN-S).2. Connection A or B can only be made by the electricity distributor or its appointed agent.Electrical safety – dwellings Approved Document P18 ONLINE VERSION
  21. 21. EXAMPLES OF ELECTRICALN E V E R S I O N O N L I INSTALLATION DIAGRAMS P Diagram 2(b) Example earthing arrangement where consumers provide their own earthing connection (referred to as a TT system)Notes:1. BS 7671:2001 requires that the part of the installation between the origin and the first RCD shall comply with the requirements for protection by Class II equipment or equivalent insulation. For the arrangement shown, this applies to the consumer unit and the wiring connecting it to the supplier’s equipment.2. The 100mA RCD component of the main switch should be of the time delayed type.Approved Document P Electrical safety – dwellings ONLINE VERSION 19
  22. 22. P ONLINE VERSIONAppendix B: Copies of BS 7671 and IEEmodel formsThe BS 7671 and IEE forms and notes on thefollowing pages are taken from IEE GuidanceNote 3, 2002 edition, and are available fordownloading from the IEE website at appear in the order:Introduction1. Introduction to Appendix 6 of BS 7671:2001(Model forms for certification and reporting).Initial inspection and testing2. Notes for short form and full versions ofElectrical Installation Certificate.3. Form 1 – Short form of Electrical InstallationCertificate (for use when one person is responsiblefor the design, construction, inspection andtesting of an installation), including guidancefor recipients.4. Form 2 – Full Electrical InstallationCertificate, including guidance for recipients(standard form from Appendix 6 of BS 7671).5. Form 3 – Schedule of Inspections (fromAppendix 6 of BS 7671) with notes.6. Form 4 – Schedule of Test Results (fromAppendix 6 of BS 7671) with notes.Minor works7. Notes on completion of Minor ElectricalInstallation Works Certificate.8. Form 5 – Minor Electrical Installation WorksCertificate, including guidance for recipients(from Appendix 6 of BS 7671).Electrical safety – dwellings Approved Document P20 ONLINE VERSION
  23. 23. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS P CERTIFICATION AND REPORTINGIntroduction i. The Electrical Installation Certificate required by Part 7 of BS 7671 shall be made out and signed or otherwise authenticated by a competent person or persons in respect of the design, construction, inspection and testing of the work. ii. The Minor Works Certificate required by Part 7 of BS 7671 shall be made out and signed or otherwise authenticated by a competent person in respect of the inspection and testing of an installation. iii. The Periodic Inspection Report required by Part 7 of BS 7671 shall be made out and signed or otherwise authenticated by a competent person in respect of the inspection and testing of an installation. iv. Competent persons will, as appropriate to their function under (i) (ii) and (iii) above, have a sound knowledge and experience relevant to the nature of the work undertaken and to the technical standards set down in this British Standard, be fully versed in the inspection and testing procedures contained in this Standard and employ adequate testing equipment. v. Electrical Installation Certificates will indicate the responsibility for design, construction, inspection and testing, whether in relation to new work or further work on an existing installation. Where design, construction and inspection and testing are the responsibility of one person, a Certificate with a single signature declaration in the form shown below may replace the multiple signatures section of the model form. FOR DESIGN, CONSTRUCTION, INSPECTION & TESTING. I being the person responsible for the Design, Construction, Inspection & Testing of the electrical installation (as indicated by my signature below), particulars of which are described above, having exercised reasonable skill and care when carrying out the Design, Construction, Inspection & Testing, hereby CERTIFY that the said work for which I have been responsible is to the best of my knowledge and belief in accordance with BS 7671: …………, amended to ………… (date) except for the departures, if any, detailed as follows. vi. A Minor Works Certificate will indicate the responsibility for design, construction, inspection and testing of the work described in Part 4 of the certificate. vii. A Periodic Inspection Report will indicate the responsibility for the inspection and testing of an installation within the extent and limitations specified on the report. viii. A schedule of inspections and a schedule of test results as required by Part 7 (of BS 7671) shall be issued with the associated Electrical Installation Certificate or Periodic Inspection Report. ix. When making out and signing a form on behalf of a company or other business entity, individuals shall state for whom they are acting. x. Additional forms may be required as clarification, if needed by non-technical persons, or in expansion, for larger or more complex installations. xi. The IEE Guidance Note 3 provides further information on inspection and testing on completion and for periodic inspections.Approved Document P Electrical safety – dwellings ONLINE VERSION 21
  24. 24. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I OElectrical installation certificatesNotes for Forms 1 and 21. The Electrical Installation Certificate is to be used only for the initial certification of a new installation or for an alteration or addition to an existing installation where new circuits have been introduced. It is not to be used for a Periodic Inspection for which a Periodic Inspection Report form should be used. For an alteration or addition which does not extend to the introduction of new circuits, a Minor Electrical Installation Works Certificate may be used. The original Certificate is to be given to the person ordering the work (Regulation 742-01-03). A duplicate should be retained by the contractor.2. This Certificate is only valid if accompanied by the Schedule of Inspections and the Schedule(s) of Test Results.3. The signatures appended are those of the persons authorised by the companies executing the work of design, construction and inspection and testing respectively. A signatory authorised to certify more than one category of work should sign in each of the appropriate places.4. The time interval recommended before the first periodic inspection must be inserted (see IEE Guidance Note 3 for guidance).5. The page numbers for each of the Schedules of Test Results should be indicated, together with the total number of sheets involved.6. The maximum prospective fault current recorded should be the greater of either the short-circuit current or the earth fault current.7. The proposed date for the next inspection should take into consideration the frequency and quality of maintenance that the installation can reasonably be expected to receive during its intended life, and the period should be agreed between the designer, installer and other relevant parties.Electrical safety – dwellings Approved Document P22 ONLINE VERSION
  25. 25. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS PApproved Document P Electrical safety – dwellings ONLINE VERSION 23
  26. 26. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I OElectrical safety – dwellings Approved Document P24 ONLINE VERSION
  27. 27. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS PApproved Document P Electrical safety – dwellings ONLINE VERSION 25
  28. 28. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I OElectrical safety – dwellings Approved Document P26 ONLINE VERSION
  29. 29. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS PApproved Document P Electrical safety – dwellings ONLINE VERSION 27
  30. 30. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I OElectrical safety – dwellings Approved Document P28 ONLINE VERSION
  31. 31. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS PApproved Document P Electrical safety – dwellings ONLINE VERSION 29
  32. 32. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I ONotes on schedule of test results* Type of supply is ascertained from the supply company or by inspection.* Ze at origin. When the maximum value declared by the electricity supplier is used, the effectiveness of the earth must be confirmed by a test. If measured the main bonding will need to be disconnected for the duration of the test.* Short-circuit capacity of the device is noted, see Table 7.2A of the On-Site Guide or 2.7.15 of GN3.* Prospective fault current (PFC). The value recorded is the greater of either the short-circuit current or the earth fault current. Preferably determined by enquiry of the supplier.The following tests, where relevant, shall be carried out in the following sequence: Continuity of protective conductors, including main and supplementary bonding Every protective conductor, including main and supplementary bonding conductors, should be tested to verify that it is continuous and correctly connected.*6 Continuity Where Test Method 1 is used, enter the measured resistance of the phase conductor plus the circuit protective conductor (R1+ R2). See 10.3.1 of the On-Site Guide or 2.7.5 of GN3. During the continuity testing (Test Method 1) the following polarity checks are to be carried out: a. every fuse and single-pole control and protective device is connected in the phase conductor only; b. centre-contact bayonet and Edison screw lampholders have outer contact connected to the neutral conductor; c. wiring is correctly connected to socket-outlets and similar accessories. Compliance is to be indicated by a tick in polarity column 11. (R1 + R2) need not be recorded if R2 is recorded in column 7.*7 Where Test Method 2 is used, the maximum value of R2 is recorded in column 7. Where the alternative method of Regulation 413-02-12 is used for shock protection, the resistance of the circuit protective conductor R2 is measured and recorded in column 7. See 10.3.1 of the On-Site Guide or 2.7.5 of GN3.*8 Continuity of ring final circuit conductors A test shall be made to verify the continuity of each conductor including the protective conductor of every ring final circuit. See 10.3.2 of the On-Site Guide or 2.7.6 of GN3.*9,*10 Insulation resistance All voltage sensitive devices to be disconnected or test between live conductors (phase and neutral) connected together and earth. The insulation resistance between live conductors is to be inserted in column 9. The minimum insulation resistance values are given in Table 10.1 of the On-Site Guide or Table 2.2 of GN3. See 10.3.3(iv) of the On-Site Guide or 2.7.7 of GN3.All the preceding tests should be carried out before the installation is energised.*11 Polarity A satisfactory polarity test may be indicated by a tick in column 11. Only in a Schedule of Test Results associated with a Periodic Inspection Report is it acceptable to record incorrect polarity.Electrical safety – dwellings Approved Document P30 ONLINE VERSION
  33. 33. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS P*12 Earth fault loop impedance Zs This may be determined either by direct measurement at the furthest point of a live circuit or by adding (R1 + R2) of column 6 to Ze. Ze is determined by measurement at the origin of the installation or preferably the value declared by the supply company used. Zs = Ze + (R1 + R2). Zs should be less than the values given in Appendix 2 of the On-Site Guide or Appendix 2 of GN3.*13 Functional testing The operation of RCDs (including RCBOs) shall be tested by simulating a fault condition, independent of any test facility in the device. Record operating time in column 13. Effectiveness of the test button must be confirmed. See Section 11 of the On-Site Guide or 2.7.16 of GN3.*14 All switchgear and controlgear assemblies, drives, control and interlocks, etc. must be operated to ensure that they are properly mounted, adjusted and installed. Satisfactory operation is indicated by a tick in column 14.Earth electrode resistance The earth electrode resistance of TT installations must be measured, and normally an RCD is required. For reliability in service the resistance of any earth electrode should be below 200W. Record the value on Form 1, 2 or 6, as appropriate. See 10.3.5 of the On-Site Guide or 2.7.13 of GN3.Approved Document P Electrical safety – dwellings ONLINE VERSION 31
  34. 34. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I OElectrical safety – dwellings Approved Document P32 ONLINE VERSION
  35. 35. COPIES OF BS 7671 AND IEE MODELE R S I O N O N L I N E V FORMS PApproved Document P Electrical safety – dwellings ONLINE VERSION 33
  36. 36. P COPIES OF BS O N L I N E MODEL FORMS N 7671 AND IEE V E R S I ONotes on completion of minor electrical installation works certificateScopeThe Minor Works Certificate is intended to be used for additions and alterations to an installation thatdo not extend to the provision of a new circuit. Examples include the addition of a socket-outlet or alighting point to an existing circuit, the relocation of a light switch, etc. This Certificate may also be usedfor the replacement of equipment such as accessories or luminaires, but not for the replacement ofdistribution boards or similar items. Appropriate inspection and testing, however, should always becarried out irrespective of the extent of the work undertaken.Part 1 Description of minor works1, 2 The minor works must be so described that the work that is the subject of the certification can be readily identified.4 See Regulations 120-01-03 and 120-02. No departures are to be expected except in most unusual circumstances. See also Regulation 743-01-01.Part 2 Installation details2 The method of protection against indirect contact shock must be clearly identified, e.g. earthed equipotential bonding and automatic disconnection of supply using fuse/circuit-breaker/RCD.4 If the existing installation lacks either an effective means of earthing or adequate main equipotential bonding conductors, this must be clearly stated. See Regulation 743-01-02. Recorded departures from BS 7671 may constitute non-compliance with the Electricity Supply Regulations 1988 as amended or the Electricity at Work Regulations 1989. It is important that the client is advised immediately in writing.Part 3 Essential testsThe relevant provisions of Part 7 (Inspection and Testing) of BS 7671 must be applied in full to all minorworks. For example, where a socket-outlet is added to an existing circuit it is necessary to:1 establish that the earthing contact of the socket-outlet is connected to the main earthing terminal;2 measure the insulation resistance of the circuit that has been added to, and establish that it complies with Table 71A of BS 7671;3 measure the earth fault loop impedance to establish that the maximum permitted disconnection time is not exceeded;4 check that the polarity of the socket-outlet is correct;5 (if the work is protected by an RCD) verify the effectiveness of the RCD.Part 4 Declaration1, 3 The Certificate shall be made out and signed by a competent person in respect of the design, construction, inspection and testing of the work.1, 3 The competent person will have a sound knowledge and experience relevant to the nature of the work undertaken and to the technical standards set down in BS 7671, be fully versed in the inspection and testing procedures contained in the Regulations and employ adequate testing equipment.2 When making out and signing a form on behalf of a company or other business entity, individuals shall state for whom they are acting.Electrical safety – dwellings Approved Document P34 ONLINE VERSION