Guidance Note 3: Inspection and Testing (Iee Guidence Notes)

✍ Scribed by Institution of Electrical Engineers

• Publisher: Institution of Electrical Engineers
• Year: 2002
• Tongue: English
• Leaves: 124
• Series: Iee Guidence Notes
• Edition: 4th
• Category: Library

✦ Synopsis

A guide to electrical inspection and testing. It is part of a series of manuals designed to amplify the particular requirements of a part of the 16th Edition Wiring Regulations. Each of the guides is extensively cross-referenced to the Regulations thus providing easy access. Some Guidance Notes contain information not included in the 16th Edition but which was included in earlier editions of the IEE Wiring Regulations. All the guides have been updated to align with BS 7671:2001.

✦ Table of Contents

CONTENTS......Page 3
CO-OPERATING ORGANISATIONS......Page 4
PREFACE AND SCOPE......Page 5
INTRODUCTION......Page 6
1.1 Safety......Page 8
1.3.2 Landlords and tenants......Page 9
1.5 Record keeping......Page 10
Relevant Criteria......Page 11
Minor Electrical Installation Works Certificate......Page 12
Diagrams, charts or tables......Page 13
c Identification of flexible cables and cords......Page 14
i Protection against both direct and indirect contact......Page 15
k Protection against indirect contact......Page 16
Specialised systems......Page 17
m Isolating and switching devices......Page 18
TABLE 2.1 Examples of utilization categories for alternating current installations......Page 19
u Erection methods......Page 20
General......Page 21
Switchgear......Page 22
Lighting points......Page 23
Cooker control unit......Page 24
General......Page 25
Nonflexible cables......Page 26
Protective conductors......Page 27
General......Page 28
2.7.4 The sequence of tests......Page 29
2.7.5 Continuity of protective conductors including main and supplementary bonding......Page 30
Fig 1a: Connections for testing continuity of protective conductors Method 1......Page 31
Fig 1b: Connections for testing continuity of protective conductors Method 2......Page 32
Step 3:......Page 33
Fig 2b:......Page 35
TABLE 2.2 Minimum values of insulation resistance......Page 36
Threephase......Page 37
Fig 3a: Insulation resistance tests between live conductors of a circuit......Page 38
Fig 3b: Insulation resistance tests to earth......Page 39
SELV......Page 40
Tests between SELV circuits and other circuits......Page 41
Electrical separation......Page 42
Protection by barriers or enclosures provided during erection......Page 44
Measuring insulation resistance of floors and walls......Page 45
Fig 4a: Test electrode 1......Page 46
Fig 4b: Test electrode 2......Page 47
Fig 5: Polarity test on a lighting circuit......Page 49
Test method 1......Page 50
Fig 6: Earth Electrode Test......Page 51
TABLE 2.3 Maximum values of earth electrode resistance for TT installations......Page 52
Measurement......Page 53
Direct measurement of Zs......Page 54
Fig 7: Test of Ze at the origin of the installation......Page 55
Residual current devices......Page 56
2.7.15 Prospective fault current......Page 57
Fig 8: Measurement of prospective short-circuit current......Page 58
Fig 9: Measurement of prospective earth fault current......Page 59
TABLE 2.4 Rated Short-circuit Capacities......Page 60
Test method......Page 61
Integral test device......Page 62
Functional checks......Page 63
3.2 Necessity for periodic inspection and testing......Page 64
3.4 Design......Page 65
TABLE 3.1 Routine Checks......Page 66
3.7 Frequency of inspection......Page 67
TABLE 3.2 Recommended Initial Frequencies of Inspection of Electrical Installations......Page 68
3.8.2 Scope......Page 69
3.8.3 Isolation of supplies......Page 70
d Accessories and switchgear......Page 71
h Protection against indirect contact......Page 72
k Marking and Labelling......Page 73
l External influences......Page 76
3.10.2 Tests to be made......Page 77
TABLE 3.3  Testing to be carried out where practicable on existing installations......Page 78
b Insulation resistance......Page 79
Motor circuits......Page 80
f Operation of overcurrent circuitbreakers......Page 81
g Operation of devices for isolation and switching......Page 82
3.10.4 Periodic Inspection Report......Page 83
4.2 Instrument accuracy......Page 84
4.4 Insulation resistance ohmmeters......Page 85
4.6 Earth fault loop impedance testers......Page 86
4.8 RCD testers......Page 87
5.3 Periodic inspection......Page 88
Introduction......Page 89
ELECTRICAL INSTALLATION CERTIFICATE (notes 1 and 2)......Page 91
ELECTRICAL INSTALLATION CERTIFICATE (notes 1 and 2)......Page 93
SCHEDULE OF INSPECTIONS......Page 96
SCHEDULE OF TEST RESULTS......Page 97
MINOR ELECTRICAL INSTALLATION WORKS CERTIFICATE......Page 100
PERIODIC INSPECTION REPORT FOR AN ELECTRICAL INSTALLATION (note 1)......Page 103
APPENDIX 1 - RESISTANCE OF COPPER AND ALUMINIUM CONDUCTORS......Page 106
TABLE 1A Values of resistance/metre for copper and aluminium conductors and of R1 + R2 per metre at 20 °C in milliohms/metre......Page 107
TABLE 1B Ambient temperature multipliers (() to Table 1A......Page 108
TABLE 1C Conductor temperature factor F for standard devices......Page 109
APPENDIX 2 - MAXIMUM PERMISSIBLE MEASURED EARTH FAULT LOOP IMPEDANCE......Page 110
TABLE 2A Maximum measured earth fault loop impedance (in ohms) when overcurrent protective device is a semi-enclosed fuse to BS 3036......Page 111
TABLE 2B Maximum measured earth fault loop impedance (in ohms) when overcurrent protective device is a fuse to BS 88-2.1 or BS 88-6......Page 112
TABLE 2C Maximum measured earth fault loop impedance (in ohms) when overcurrent protective device is a fuse to BS 1361......Page 113
TABLE 2D Maximum measured earth fault loop impedance (in ohms) when overcurrent protective device is......Page 114
TABLE 2E Ambient temperature correction factors......Page 115
C......Page 119
H......Page 120
P......Page 121
S......Page 122
U......Page 123
Tables & figs......Page 0