IET TheInstitutionof EngineeringandTechnology
GuidanceNote3 Inspection & Testing
GuidanceNote3 Inspection & Testing
Published by the Institution of Engineering and Technology London Uniled Kingdom
Scotland (no. SC038698).
q u si oe o together of the IEE (The Institution of Electrical Engineers) and the HE(The Institutionof Incorporated Engineers).
2008 2012 2015 2018 2022The Institution of Engineering and Technology 1992 1995 1997 2002The Institution of Electrical Engineers
First published 1992 (0 85296 537 0)Second edition (incorporating Amendment No. 1to BS7671:1992) 1995 (0 85296 867 1) Reprinted (with amendments to Section 17) 1993Third edition (incorporating Amendment No. 2 to BS7671:1992) 1997 (0 85296 956 2)Fourth edilion (incorporating Amendment No. 1to BS7671:2001) 2002(0 85296 991 0) Reprinted (with new cover) 2003Reprinted (incorporating Amendment No.2to BS7671:2001) 2004Reprinted (with amendments to imprint page) 2006 Fifth edition (incorporating BS 7671:2008) 2008 (978-0-86341-857-0)Sixth edion (incorporating AmendmentNo. 1to BS 7671:2008)2012 (978-1-84919-275-0) Reprinted 2009 2010Seventh edition (incorporating Amendment Nos. 2 and 3 to BS7671:2008)2015 (978-1-84919-873-8)Reprinted (with minor corrections) 2015 Eighth edition (incorporating BS 7671:2018) 2018 (978-1-78561-452-1)Ninth edition (incorporating Amendment No. 2 to BS 7671:2018)2022 (978-1-83953-236-8)
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ISBN 978-1-83953-238-2 (vitalsource) ISBN 978-1-83953-236-8(paperback)
Typeset in the UK by The Institution of Engineering and Technology StevenagePrinted in the UK by Sterling Press Ltd Kettering
Contents
Chapter2 Initial verification 21
2.1 2.2 Purpose of initial verication Certificates 22 212.3 Required information Frequency of subsequent inspections 23 242.4 2.5 Initial inspection 252.5.1 2.5.2 General procedure Comments on individual items to be inspected 25 252.5.3 Inspection checklist 462.6 Tests associated with initial verification 2.6.1 Test results 54 542.6.2 Electrical Installation Certificate (EIC) 552.6.4 2.6.3 Model forms The sequence of tests 55 552.6.5 Continuity of protective conductors including main2.6.6 Continuity of ring final circuit conductors and supplementary bonding 56 622.6.8 ConfrmingSELVor PELVcircuits by insulation resistance testing 2.6.7 Insulation resistance 672.6.9 Testing of electrically separated circuits 73 742.6.11 Proving and testing of non-conducting location 2.6.10 Testing of functional extra-low voltage (FELV) circuits 75(insulation resistance/impedance (sllem pue suoog jo 762.6.12 Polarity testing 2.6.13 Earth electrode resistance testing 78 79
2.6.14 Protection by automatic disconnection of supply (ADS) 2.6.15 Earth fault loop impedance (EFLl) verification 85 852.6.16 Prospective fault current (Ipf) 882.6.17 Phase sequence testing 2.6.18 Operation and functional testing of RCDs 96 932.6.19 Other functional testing 2.6.20 Verification of voltage drop 1022.6.21 Verification of protection of low voltage (LV) 102installations against temporaryovervoltages due to faults in the high voltage (HV) or LV system 1032.6.22 Verification of protectionagainst overvoltages of atmospheric2.6.23 Verification of measures against electromagnetic origin or due to switching 104disturbances 105
Chapter3 2.6.24 Prosumer's electrical installations (PEls) Periodic inspection and testing 1063.1 Purpose of periodic inspection and testing 109 1093.2 Necessity for periodic inspection and testing 109Electricity at Work Regulations (EAWR) 3.3.1 The need for appropriate inspection and testing 110 1103.3.2 Diverted neutral currents Safety in inspection and testing 1113.4 Design 3.3.3 111 1113.5 Routine checks 1123.6 3.7 Frequency of periodic inspections Required information 113 1143.8 Requirements for periodic inspection and testing 3.8.1 Process: prior to carrying out inspection and testing 117 1173.8.2 General procedure 1183.9 Periodic inspection 3.8.3 Setting inspection and testing samples 123 1193.9.1 Example checklist of items that require inspection 1233.10 Periodic testing 3.10.1 General 128 1283.10.2 Tests to be made 1283.11 Electrical Installation Condition Report (EICR) 3.10.3 Additional notes on periodic testing 130 1333.12 Periodic inspection of installtions constructed to an earlier editionChapter 4 of BS 7671 or the IEE Wiring Regulations Test instruments and equipment 137 1354.1 Instrument standard 1374.2 Instrument accuracy 139 1384.3 4.4 Insulation resistance testers Low-resistance ohmmeters 1404.5 4.6 Earth electrode EFLItesters 140 1434.7 RCD testers resistance testers 1434.8 4.9 Phase rotation instruments 144 144Chapter5 Forms equipment 1495.1 Initial verification (inspection and testing) forms 1495.2 Minor works 150
