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IET Guidance Note 3 Inspection and Testing 8th Edition 2018 (PDF)

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Place of Publication: United Kingdom;
Pages: 157 pages;
Size: 49 Mb;
Publisher: IET;
Language: English;
Published: 2018

This Guidance Note is part of a series issued by the Institution of Engineering and Technology to explain and enlarge upon the requirements in BS 767l:2018, the 18th Edition of the IET Wiring Regulations.

This Guidance Note is concerned principally with Part 6 of BS 7671 Inspection and testing.


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
1.4. Additions and alterations
1.5. Departures and non-compliance
1.6. Record keeping
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. Initial testing
2.6.1. Test results
2.6.2. Electrical Installation Certificate
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 Insulation resistance
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
2.10. Testing of functional extra-low voltage (FELV) circuits
2.11. Protection by barriers or enclosures provided during erection
2.12. Proving and testing of non-conducting location (insulation resistance/impedance of floors and walls)
2.13. Polarity testing
2.14. Earth electrode resistance testing
2.6.15 Protection by automatic disconnection of supply
2.6.16 Earth fault loop impedance verification
2.6.17 Prospective fault current, lpf
2.6.18 Phase sequence testing
2.6.19 Operation and functional testing of RCDs
2.6.20 Other functional testing
2.6.21 Verification of voltage drop
2.6.22 Verification in medical locations
2.6.23 Verification of protection of low voltage installations against temporary overvoltages due to faults in the high voltage or low voltage system
2.6.24 Verification of protection against overvoltages of atmospheric origin or due to switching
2.6.25 Verification of measures against electromagnetic disturbances
Chapter 3 Periodic inspection and testing
3.2. Purpose of periodic inspection and testing
3.2. Necessity for periodic inspection and testing
3.3. Electricity at Work Regulations
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 Scope
3.8.2 Process - prior to carrying out inspection and testing
3.8.3 General procedure
3.8.4 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
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 Earth fault loop impedance testers
4.6 Earth electrode resistance testers RCD testers
4.7 Phase rotation instruments
4.8 Thermographic equipment
Chapter 5 Forms
5.1 Initial verification (inspection and testing) forms
5.2 Minor works
5.3 Periodic inspection and testing
5.4 Model forms for certification and reporting
Appendix A Maximum permissible measured earth fault loop impedance
A1 Tables
A2 Appendix 3 of BS 7671
A3 Methods of adjusting tabulated values of Zs
Appendix B Resistance of copper and aluminum conductors
B1 Standard overcurrent devices
B2 Steel-wire armor, steel conduit and steel trunking

Tags: guidance note 3, guide note 3, iet note 3, inspection and testing guide, note 3 iet, iet guidance, iet guide 3

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