Books. Code of Practice for In-Service Inspection and Testing of Electrical Equipment (3rd edition) By IET Publication

Transcription

1 Books Code of Practice for In-Service Inspection and Testing of Electrical Equipment (3rd edition) By IET Publication Available: 2008 Format: Paperback Product Code: PWR08630 ISBN: Pagination: 138 pp. Description This Code of Practice has been revised to reflect current best practice. It gives advice on in-service inspection and testing to determine whether electrical equipment is fit for continued service or maintenance or replacement is necessary. The main changes in this edition of the Code include clarification of which equipment is covered, additional explanation of the term competent person and inclusion of the substitute/alternative test method. In addition there is explanation on the use of test leads and RCD adaptors and extension leads are now covered. As many deficiencies result from the plug or the cable, new Appendices give a series of pictures which illustrate commonly-encountered deficiencies. The book contains full colour illustrations and photographs to aid use. The Code recognizes the publication of the 17th Edition of BS 7671: Book Readership The updated Code of Practice gives guidance to all those responsible for the inspection, testing and maintenance of electric appliances. It also provides advice on compliance with health and safety legislation. The text specifies the frequency and scope of inspections and testing in different environments.

2 Contents Cooperating organisations Acknowledgements Preface Introduction 1 Part 1 Administration of Inspection and Testing 5 1 Scope Users of electrical equipment, persons managing a maintenance scheme, persons performing inspections and tests and other dutyholders Users of electrical equipment Persons managing a maintenance scheme (Administrators) Persons undertaking the practical inspection and testing of electrical equipment Other dutyholders such as company directors, managers and building services managers Equipment Premises Voltages and phases Summary of the objectives of this Code of Practice 8 2 Definitions 11 3 The law The legislation The Health and Safety at Work etc. Act The Management of Health and Safety at Work Regulations The Provision and Use of Work Equipment Regulations The Electricity at Work Regulations Workplace (Health, Safety and Welfare) Regulations Scope of the legislation Who is responsible? Maintenance 24 4 Fixed electrical installation Means of earthing RCD protection Sufficient socket-outlets should be provided Accessories should be undamaged Specialized installations 26 ix x xi iii

3 5 Types of electrical equipment Portable appliances Movable equipment (sometimes called transportable) Hand-held appliances or equipment Stationary equipment or appliances Fixed equipment or appliances Appliances or equipment for building-in Information technology equipment Extension leads and RCD extension leads Multiway adaptors and RCD adaptors 30 6 The electrical tests Testing throughout the life of equipment Manufacturer s type testing Manufacturer s production testing In-service inspection and testing Testing after repair 32 7 In-service inspection and testing Inspection Categories of inspection and testing Frequency of inspection and testing Review of frequency of inspection and testing 36 8 Procedures for in-service inspection and testing The basic requirement Test and repair equipment Documentation Labelling Damaged or faulty equipment User responsibilities Provision of test results 39 9 Training The system The user The administrator or manager The inspector The test operative Training Experience The person repairing faulty equipment 43 iv

4 10 Test instruments Safety of test equipment Test instruments Test probes and leads Test probes and leads for use in conjunction with a voltmeter, multimeter, electrician s test lamp or voltage indicator Portable appliance test instruments Three-phase equipment Low resistance ohmmeters (for earth continuity testing) Insulation resistance ohmmeters (applied voltage method) Dielectric strength testing Instrument accuracy 48 Part 2 Inspection and Testing (including user checks) Equipment constructions Class I Class I typical construction showing basic insulation and earthed metal Class I construction showing the use of air as a basic insulation medium Class I construction incorporating unearthed metal separated from live parts by basic and supplementary insulation Class I construction incorporating unearthed metal separated from live parts by basic insulation and earthed metal Class II Class II equipment with a substantial enclosure of insulating material comprising basic and supplementary insulation Class II equipment with a substantial enclosure of reinforced insulating material Class II equipment with a substantial enclosure of insulating material the insulation construction includes air Class II equipment with unearthed metal in the enclosure, separated from live parts by basic and supplementary insulation Class II equipment with unearthed metal separated from live parts by reinforced insulation Class II equipment with unearthed metal separated from live parts by basic and supplementary insulation including air gaps Metal-encased Class II equipment Class III Class 0 and 0I Class 0 equipment Class 0I equipment Types of inspection and testing The user check 63 v

5 14 The formal visual inspection Manufacturer s instructions Suitability of the equipment for the environment Switching of equipment Functional switching Isolation and switching off for mechanical maintenance Emergency switching User feedback The equipment Equipment failing the formal visual inspection Recording the formal visual inspection Combined inspection and testing Preliminary inspection Test procedures In-service tests The earth continuity test The insulation resistance test Protective conductor/touch current measurement Functional checks Damaged or faulty equipment Appliance cord sets Extension leads, multiway adaptors and RCD adaptors Extension leads RCD extension leads Multiway adaptors and RCD adaptors Microwave ovens High protective conductor currents Replacement of appliance flexes Plug fuses Equipment that cannot be located 82 Part 3 Appendices 83 I British Standards 85 II Legal references and notes 87 II.1 Health and Safety at Work etc. Act II.2 The Electricity at Work Regulations 1989 Statutory Instrument No II.3 Management of Health and Safety at Work Regulations 1999 Statutory Instrument No II.4 Provision and Use of Work Equipment Regulations 1998 Statutory Instrument No as amended 90 II.4.1 General 90 II.4.2 Maintenance 90 vi

6 II.4.3 Inspection of work equipment that poses electrical risks 90 II.4.4 Specific risks 91 II.4.5 Information and instructions 91 II.4.6 Training 91 II.4.7 Isolation from sources of energy 91 II.4.8 Maintenance operations 92 III The Electricity at Work Regulations 93 III.1 Regulation 4: Systems, work activities and protective equipment 93 III.1.1 Regulation 4(2) 93 III.1.2 Regulation 4(3) 94 III.2 Regulation 5: Strength and capability of electrical equipment 94 III.3 Regulation 6: Adverse or hazardous environments 94 III.4 Regulation 7: Insulation, protection and placing of conductors 95 III.5 Regulation 8: Earthing or other suitable precautions 95 III.6 Regulation 10: Connections 95 III.7 Regulation 12: Means of cutting off the supply and for isolation 96 III.8 Regulation 13: Precautions for work on equipment made dead 96 III.9 Regulation 14: Work on or near live conductors 96 III.10 Regulation 15: Working space, access and lighting 97 III.11 Regulation 16: Persons to be competent to prevent danger and injury 97 IV Summary of legislation and guidance 99 V Production testing 103 V.1 BEAB for BS EN series, household and similar appliances 103 V.1.1 Introduction 104 V.1.2 Functional tests and load deviation 104 V.1.3 Earth continuity test 104 V.1.4 Electric strength tests 105 V.1.5 Additional requirements for microwave ovens covered by BS EN safety standard 106 V.2 BEAB for BS EN 60065, audio, video and similar appliances 106 V.2.1 Introduction 107 V.2.2 Functional tests 107 V.2.3 General considerations 107 V.2.4 Test method 107 V.2.5 Earth continuity test 107 V.2.6 Insulation resistance 107 V.2.7 Electric strength test 108 V.2.8 Combined test 108 V.2.9 Specific requirements for television room aerials 108 V.3 BEAB for BS EN 60950, information technology and similar appliances 108 V.3.1 Introduction 108 V.3.2 Functional tests 109 vii

7 V.3.3 General considerations 109 V.3.4 Test method 109 V.3.5 Earth continuity test 109 V.3.6 Earth leakage test 109 V.3.7 Electric strength test 110 V.3.8 Combined test 110 V.4 BABT 111 VI Model forms for in-service inspection and testing 113 Form VI.1 Equipment register 115 Form VI.2 Equipment formal visual and combined inspection and test record 117 Form VI.3 Equipment labels 118 Form VI.4 Repair register 119 Form VI.5 Faulty equipment register 120 Form VI.6 Test instrument record 121 VII Resistance of flexible cords 123 VIII Checks to be made on a plug, a cable and an extension lead 125 IX Guide to isolation procedures 133 Index 135 viii