Guidance Note 1: Selection and Erection of Equipment (Iee Guidence Notes)

CONTENTS......Page 3
ACKNOWLEDGEMENTS......Page 7
PREFACE......Page 10
INTRODUCTION......Page 11
1.2 Equipment......Page 13
1.4 The Construction (Design and Management) Regulations 1994......Page 14
Internal lighting......Page 15
Table 1.1  Method for determining the number of locations to be equipped as a reasonable provision for efficient lighting......Page 16
1.6 Competence......Page 17
2.3 Compliance with standards......Page 19
HARMONISATION DOCUMENTS (HDs)......Page 20
MOTORS......Page 21
CABLES......Page 22
WARNING NOTICES......Page 24
OTHER NOTICES......Page 25
PIPES AND DUCTS......Page 26
Fig 2.1:  Typical installation......Page 27
TABLE 2.1  (From TABLE 51A of BS 7671) Colour identification of cores of non-flexible cables and bare conductors for fixed wiring......Page 28
TABLE 2.2  Warning notices and identification labels required by BS 7671......Page 29
2.7 Compatibility......Page 30
2.8 \'Clean\' (low noise) earths......Page 32
2.9 LV switchgear and controlgear assemblies......Page 33
Form 1......Page 34
Fig 2.2:  Form 1 Construction......Page 35
Form 4......Page 36
Fig 2.3:  Form 4 Construction (Type 7)......Page 38
Earthed equipotential bonding and automatic disconnection of supply (EEBADS)......Page 40
3.2 Overcurrent protective devices......Page 41
TABLE 3.1  Comparison of overcurrent protective devices......Page 42
3.3 Fuses......Page 43
TABLE 3.2  Rated short-circuit capacities of fuses......Page 44
TABLE 3.3  Circuit-breakers overcurrent protection......Page 45
TABLE 3.4  Rated breaking capacity for miniature circuit-breakers to BS 3871, circuit-breakers to......Page 46
3.5 Insulation monitoring devices......Page 47
TERMINOLOGY......Page 48
A WIDE CHOICE......Page 50
Types \'AC\', \'A\' and \'B\' RCDs......Page 51
TABLE 3.5  Standard values of break time and non-actuating time for Type AC RCCBs......Page 52
TABLE 3.6  Standard values of break time and non-actuating time for operating under residual conditions for Type AC RCBOs......Page 53
Fig 3.1:  Installing RCDs in a TT installation......Page 54
SELECTION OF TYPES OF RCDs......Page 55
TWO DISTINCT CATEGORIES......Page 56
LIMITATIONS AND PRECAUTIONS......Page 57
UNWANTED TRIPPING......Page 58
3.7 Earthed equipotential bonding and automatic disconnection of supply......Page 59
TYPES OF PROTECTIVE CONDUCTOR......Page 61
EARTHING OF FLUSH METAL ACCESSORY BOXES......Page 62
TABLE 3.7a  Minimum cross-sectional areas (csa) of earthing conductor and main equipotential bonding conductors for TN-S systems......Page 64
TABLE 3.7b  Minimum cross-sectional areas (csa) of earthing conductor and main equipotential bonding conductors for TN-C-S (PME) systems......Page 65
TABLE 3.8  Supplementary bonding conductors......Page 66
AQ CRITERIA......Page 67
WHERE PROTECTION IS NOT REQUIRED......Page 68
SURGE PROTECTIVE DEVICES (SPDs)......Page 69
SWITCHING OVERVOLTAGES......Page 70
4.1 External influences......Page 71
4.2 Ambient temperature (AA)......Page 72
4.3 Solar radiation (AN) and  ultra-violet radiation......Page 73
4.5 Presence of water (AD) or high humidity (AB)......Page 74
4.6 Presence of solid foreign bodies (AE)......Page 75
4.7 Presence of corrosive or polluting substances (AF)......Page 76
4.8 Impact (AG), vibration (AH) and other mechanical stresses (AJ)......Page 78
4.9 Presence of fauna (AL), flora and/or mould growth (AK)......Page 79
(1) LOCATIONS WHERE A RISK OF FIRE EXISTS DUE TO THE NATURE OF PROCESSED OR STORED MATERIALS......Page 80
CONDUIT AND TRUNKING SYSTEMS......Page 83
5.1 Cable selection......Page 84
TABLE 5.1  Performance requirements in BS EN 50086-1 : General conditions for conduit systems......Page 87
5.2 Cable concealed in structures......Page 88
Fig 5.1:  Permitted cable routes......Page 89
TABLE 5.2  Joist and stud notch and drill limits......Page 90
Fig 5.3:  Cables in floor joists......Page 91
5.5 Selection of cables and wiring systems with low emission of smoke and corrosive gases when affected by fire......Page 92
TABLE E3  Ambient temperature multipliers to ......Page 0
5.7 Buried cables......Page 96
TABLE 5.3  Agreed colours of ducts, pipes cables and marker/ warning tapes for public service undertaking......Page 98
5.8 Sealing and fire stopping......Page 99
6.2 Diversity......Page 101
6.3 Neutral conductors......Page 102
6.4 Voltage drop in consumers\' installations......Page 104
7.1 Electrical connections......Page 106
7.2 Cables in contact with thermal insulation......Page 108
TABLE 7.1  Cables surrounded by thermal insulation (Table 52A of BS 7671)......Page 109
7.3 Mutual or individual deterioration......Page 111
7.4 Proximity to other services......Page 112
Fig 7.1:  Circuit for reducing interference with induction loop......Page 114
8.1 Equipment having a high protective conductor current......Page 116
8.2 Water heating......Page 117
8.4 Other equipment......Page 118
8.5 Luminaires......Page 120
8.6 Selection and erection in relation to operation and maintainability......Page 122
ISOLATION......Page 123
a) General......Page 126
TABLE A2  Conduit factors for use in short straight runs......Page 128
TABLE A3  Cable factors for use in conduit in long straight runs over 3 m, or runs of any length incorporating bends......Page 129
TABLE A4  Cable factors for runs incorporating bends and long straight runs......Page 130
e) For other sizes and types of cable in conduit or trunking, including flexible conduit......Page 131
TABLE A5  Cable factors for trunking......Page 132
TABLE A6  Factors for trunking......Page 133
IP code for ingress protection......Page 135
Drip Proof and Splash Proof......Page 141
a) General......Page 143
b) Final circuits using socket-outlets and fused connection units complying with BS 1363......Page 144
TABLE C1  Typical final circuits using BS 1363 socket-outlets in household installations......Page 145
d) Cooker final circuits in household premises......Page 148
f) Provision of socket-outlets......Page 149
TABLE C2  Recommended provision of socket-outlets  (All socket-outlets are twin)......Page 151
g) Mounting heights of accessories......Page 152
Fig C1:  Heights of switches, sockets etc.......Page 153
APPENDIX D: LIMITATION OF EARTH FAULT LOOP IMPEDANCE FOR COMPLIANCE WITH REGULATION 543-01-01......Page 155
TABLE D1  Maximum earth fault loop impedance (in ohms) when overcurrent protective device is a fuse to BS 3036......Page 160
TABLE D2  Maximum earth fault loop impedance (in ohms) when overcurrent protective device is a fuse to BS 88-2.1 or BS 88-6......Page 161
TABLE D3  Maximum earth fault loop impedance (in ohms) when overcurrent protective device is a fuse to BS 1361......Page 162
TABLE D4  Maximum measured earth fault loop impedance (in ohms) when overcurrent protective......Page 163
TABLE D5  Cross-sectional areas of steel conduit and trunking......Page 165
TABLE D6  Copper conductor, thermoplastic (pvc) insulated steel-wire armoured cables to BS 6346 and fuses to BS 88......Page 167
TABLE D7  Copper conductor, thermoplastic (pvc) insulated steel wire armoured cables to BS 6346 and miniature circuit-breakers......Page 168
TABLE D8  Copper conductor, 90 °C thermosetting insulated steel-wire armoured cables to BS 5467 and fuses to BS 88......Page 169
TABLE D9  Thermoplastic (pvc)/SWA/thermoplastic (pvc) cables to BS 6346. Insulation operating at 70 °C.......Page 170
TABLE D10A  90 °C thermosetting insulated steel-wire armoured cables to BS 5467 and BS 6724. Insulation operating at 90 °C.......Page 171
TABLE D10B  90 °C thermosetting insulated steel-wire armoured cables to BS 5467 and BS 6724. Insulation operating at 70 °C.......Page 172
TABLE D11......Page 173
APPENDIX E: RESISTANCE AND IMPEDANCE OF COPPER AND ALUMINIUM CONDUCTORS UNDER FAULT CONDITIONS......Page 176
TABLE E1  Values of resistance/metre for copper and aluminium conductors and of (R1 + R2)/metre in milliohms/metre......Page 179
TABLE E4  Values of R1 and R2 for mineral insulated cable with copper sheath......Page 181
APPENDIX F: SELECTION AND ERECTION OF WIRING SYSTEMS......Page 184
TABLE F1  Comparison of harmonised cable types to BS 6004......Page 185
TABLE F2  Designation system for cables complying with the European Harmonisation Standard......Page 186
TABLE F3  Commonly used cable type reference numbers......Page 187
TABLE F4  Applications of cables for fixed wiring......Page 188
TABLE F5  Applications of flexible cables and cords to BS 6007 : 1993, BS 6141 : 1991 and BS 6500 : 2000 generally......Page 189
APPENDIX G: NOTES ON METHODS OF SUPPORT FOR CABLES, CONDUCTORS AND WIRING SYSTEMS......Page 191
TABLE G1  Minimum internal radii of bends in cables for fixed wiring......Page 194
TABLE G2  Spacings of supports for cables in accessible positions the entire support derived from the clips......Page 195
TABLE G3  Maximum lengths of span and minimum heights above ground for overhead wiring between buildings etc.......Page 196
TABLE G4  Spacings of supports for conduits......Page 197
TABLE G5  Spacings of supports for cable trunking......Page 198
APPENDIX H: MAXIMUM DEMAND AND DIVERSITY......Page 199
TABLE H1  Current demand to be assumed for points of utilisation and current-using equipment......Page 200
TABLE H2  Allowances for diversity......Page 202
APPENDIX I: MINIMUM SEPARATING DISTANCES BETWEEN ELECTRICITY SUPPLY CABLES AND TELECOMMUNICATIONS OR CONTROL CABLES......Page 204
TABLE I1  Example of power cable and information technology cables that run parallel with a metallic divider......Page 206
TABLE I2  Separation of systems......Page 207
TABLE J1  Measured protective conductor/ touch current......Page 208
A. General symbols......Page 209
B. Symbols for use in schematic wiring diagrams......Page 213
C. Location symbols for installations......Page 215
APPENDIX L: ADDRESSES OF ASSOCIATED BODIES AND IDENTIFICATION SYMBOLS......Page 217
C......Page 225
E......Page 227
H......Page 228
L......Page 229
O......Page 230
S......Page 231
X......Page 232