IET Guidance Note 3 Inspection & Testing to BS 7671:2018+A2:2022, 9th Edition 2022 (PDF)

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Edition: 2022

Pages: 201

Publisher: IET

Author: IET

Language: English;

Size: 100 Mb;

Updated to BS7671:2018+A2:2022 IET Wiring Regulations.

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 7671:2018:2022.


Cooperating organizations




Chapter 1 General requirements

1.1 Safety

1.2 Required competence

1.3 The client

1.3.1 Certificates and reports

1.3.2 Rented domestic and residential accommodation

1.3.3 The Construction (Design and Management) Regulations 2015

1.4 Additions and alterations

1.5 Departures and non-compliance

1.6 Record-keeping

1.7 Installations requiring specialist knowledge, training or experience

Chapter 2 Initial verification

2.1 Purpose of initial verification

2.2 Certificates

2.3 Required information

2.4 Frequency of subsequent inspections

2.5 Initial inspection

2.5.1 General procedure

2.5.2 Comments on individual items to be inspected

2.5.3 Inspection checklist

2.6 Tests associated with initial verification

2.6.1 Test results

2.6.2 Electrical Installation Certificate (EIC)

2.6.3 Model forms

2.6.4 The sequence of tests

2.6.5 Continuity of protective conductors, including main and supplementary bonding

2.6.6 Continuity of ring final circuit conductors

2.6.7 Insulation resistance

2.6.8 Confirming SELV or PELV circuits by insulation resistance testing

2.6.9 Testing of electrically separated circuits

2.6.10 Testing of functional extra-low voltage (FELV) circuits

2.6.11 Proving and testing of non-conducting location (insulation resistance/impedance of floors and walls)

2.6.12 Polarity testing

2.6.13 Earth electrode resistance testing

2.6.14 Protection by automatic disconnection of supply (ADS)

2.6.15 Earth fault loop impedance (EFLI) verification

2.6.16 Prospective fault current (Ipf)

2.6.17 Phase sequence testing

2.6.18 Operation and functional testing of RCDs

2.6.19 Other functional testing

2.6.20 Verification of voltage drop

2.6.21 Verification of protection of low voltage (LV) installations against temporary overvoltages due to faults in the high voltage (HV) or LV system

2.6.22 Verification of protection against overvoltages of atmospheric origin or due to switching

2.6.23 Verification of measures against electromagnetic disturbances

2.6.24 Prosumer's electrical installations (PEls)

Chapter 3 Periodic inspection and testing

3.1 Purpose of periodic inspection and testing

3.2 Necessity for periodic inspection and testing

3.3 Electricity at Work Regulations (EAWR)

3.3.1 The need for appropriate inspection and testing

3.3.2 Safety in inspection and testing

3.3.3 Diverted neutral currents

3.4 Design

3.5 Routine checks

3.6 Required information

3.7 Frequency of periodic inspections

3.8 Requirements for periodic inspection and testing

3.8.1 Process: prior to carrying out inspection and testing

3.8.2 General procedure

3.8.3 Setting inspection and testing samples

3.9 Periodic inspection

3.9.1 Example checklist of items that require inspection

3.10 Periodic testing

3.10.1 General

3.10.2 Tests to be made

3.10.3 Additional notes on periodic testing

3.11 Electrical Installation Condition Report (EICR)

3.12 Periodic inspection of installations constructed to an earlier edition of BS 7671 or the IEE Wiring Regulations

Chapter 4 Test instruments and equipment

4.1 Instrument standard

4.2 Instrument accuracy

4.3 Low-resistance ohmmeters

4.4 Insulation resistance testers

4.5 EFLI testers

4.6 Earth electrode resistance testers

4.7 RCD testers

4.8 Phase rotation instruments

4.9 Thermographic equipment

Chapters Forms

5.1 Initial verification (inspection and testing) forms

5.2 Minor works

5.3 Periodic inspection and testing

5.4 Examples of completed model forms for certification and reporting

Appendix A Maximum permissible measured earth fault loop impedance (EFLI)

Al Tables

A2 Appendix 3 of BS 7671

A3 Methods of adjusting tabulated values of Zs

Appendix B Resistance of copper and aluminium conductors

B1 Standard overcurrent devices

B2 Steel wire armour (SWA), steel conduit and steel trunking

B3 Mineral-insulated copper-sheathed cable

Appendix C Use of an earth leakage current clamp meter to provide an indication of the state of insulation

Appendix D Safety check for diverted neutral currents

DI Dangers associated with diverted neutral currents

D2 How to check for diverted neutral currents


Tags: guidance note 3 edition 2022, guide note 3-9th ed, iet note 3, inspection and testing guide, note 3 iet, iet guidance

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