Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

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‘cable trunking’ means a manufactured enclosure for the protection of cables, normally of rectangular cross section, of which one side is removable or hinged. ‘circuit breaker’ means a mechanical switching device capable of making, carrying and breaking currents under normal circuit conditions and also of making, carrying for a specified time, and breaking currents under specified abnormal circuit conditions, such as those of short circuit. ‘circuit protective conductor’ means a protective conductor connecting exposed conductive parts of equipment to the main earthing terminal. ‘connector’ means a device which is provided with female contacts and is intended to be attached to the flexible cable connected to the supply. ‘danger’ means a risk of bodily injury or loss of life or health from shock, burn, asphyxiation or other causes. ‘dead’ means at or about zero voltage and disconnected from any live system. ‘duct’ means a closed passage way formed underground or in a structure and intended to receive one or more cables which may be drawn in. ‘earth electrode resistance’ means the resistance of an earth electrode to earth. ‘earth fault loop impedance’ means the impedance of the earth fault current loop (phase to earth loop) starting and ending at the point of earth fault. ‘earthed’ means connected to the general mass of earth in such a manner as will ensure at all times an immediate discharge of electrical energy without danger; when applied to electrical equipment, all phases short-circuited and effectively connected to earth. ‘earthing conductor’ means a protective conductor connecting a main earthing terminal of an installation to an earth electrode or to other means of earthing. ‘enclosure’ means a part providing an appropriate degree of protection of equipment against certain external influences and a defined degree of protection against contact with live parts from any direction. ‘equipment’ means electrical equipment. ‘equipotential bonding’ means electrical connection putting various exposed conductive parts and extraneous conductive parts at a substantially equal potential. ‘extra low voltage’ means voltage normally not exceeding 50V root mean square alternating current or 120V direct current, between conductors or between a conductor and earth. 12
‘fault protection’ means protection against dangers that may arise from indirect contact with live parts of the installation (contact with an exposed conductive part that is not normally live but has become live under fault conditions). ‘fuse element’ means a part of a fuse designed to melt when the fuse operates. ‘fuse link’ means that part of a fuse, including the fuse element, which requires replacement by a new fuse link after the fuse element has melted and before the fuse can be put back into service. ‘high voltage’ means voltage normally exceeding low voltage. ‘H.V. enclosure’ means a substation, standby generator house, distribution centre and a room or other enclosure wherein high voltage apparatus is installed. “Danger” notice shall be permanently affixed outside H.V. enclosure access doors. ‘installation’ means electrical installation. ‘live’ means electrically charged. ‘live work’ means electrical work on or near any live conductor. This is anywhere a worker is exposed to energised conductors, terminals, busbars or contacts. ‘low voltage’ means voltage normally exceeding extra low voltage but normally not exceeding: between conductors, 1000V root mean square alternating current or 1500V direct current, or between a conductor and earth, 600V root mean square alternating current or 900V direct current. ‘overhead line’ is defined in the Electricity (Wiring) Regulations as a conductor that is placed above ground and is suspended in the open air. ‘PELV (Protective Extra-Low Voltage)’ means an extra-low voltage system which is not electrically separated from earth, but which otherwise satisfies all the requirements for SELV. ‘permit-to-work’ means an official form signed and issued by a responsible person to a person having the permission of the responsible person in charge of work to be carried out on any earthed electrical equipment for the purpose of making known to such person exactly what electrical equipment is dead, isolated from all live conductors, has been discharged, is connected to earth, and on which it is safe to work. 13
Page 2 and 3: CODE OF PRACTICE FOR THE ELECTRICIT
Page 4 and 5: Page 6G Final Circuits Using 16A In
Page 6 and 7: Page 17. Display of Labels and Noti
Page 8 and 9: Page Appendices 208 1. Prescribed R
Page 10 and 11: Code 1 INTRODUCTION PART I This Cod
Page 14 and 15: ‘powertrack system’ means an as
Page 16 and 17: Code 3 APPLICATION 3A General Appli
Page 18 and 19: Code 4 GENERAL SAFETY REQUIREMENTS
Page 20 and 21: warning notices and the placing of
Page 22 and 23: 4E Working Space (a) A minimum clea
Page 24 and 25: Additional lighting should be provi
Page 26 and 27: (b) Work procedure for High Voltage
Page 28 and 29: (ii) Keep hands away from any circu
Page 30 and 31: Code 5 SEGREGATION OF CIRCUIT CATEG
Page 32 and 33: (i) A minimum horizontal or vertica
Page 34 and 35: Code 6 CIRCUIT ARRANGEMENT 6A Divis
Page 36 and 37: (2) Control Each circuit should be
Page 38 and 39: (4) Permanently connected equipment
Page 40: Type of Circuit A1 Ring A2 Radial A
Page 47 and 48: Code 7 CURRENT DEMAND 7A Current De
Page 49 and 50: Purpose of Conductors or Switchgear
Page 51 and 52: Code 8 ISOLATION AND SWITCHING 8A P
Page 53 and 54: (iv) luminaires (lamp replacement a
Page 55: (3) Devices for switching off for m
Page 58 and 59: Code 9 OVERCURRENT PROTECTIVE DEVIC
Page 60 and 61: Overload protective devices may hav
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Table 9(1) Limiting Final Temperatu
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Table 9(4) Classification of MCB to
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Code 10 NEUTRAL CONDUCTOR PROTECTIV
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Code 11 EARTH LEAKAGE AND EARTH FAU
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(b) Subject to subparagraph (a) abo
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(Note: 1. An extraneous conductive
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(d ) Where a residual current devic
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(c) Values of k for protective cond
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Table 11(4) Minimum Cross-sectional
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Table 11(11) Maximum Earth Fault Lo
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Code 12 EARTHING ARRANGEMENT 12A Ge
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(4) Plate electrode Plate electrode
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Code 13 CONDUCTORS, JOINTS AND CONN
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(a) the ambient temperature does no
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(2) Identification of cable cores (
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Code 14 WIRING INSTALLATION ENCLOSU
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(b) Flexible steel conduits should
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14E Cable Capacity of Enclosures (1
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Table 14(2) Cable Factors and Condu
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Table 14(4) Cable Factors and Trunk
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Code 15 ADVERSE CONDITIONS INSTALLA
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(c) Where cables are to be connecte
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(d ) Electrical equipment and wirin
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(b) There should be adequate means
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Table 15(4) Selection of Electrical
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Code 16 OVERHEAD LINE INSTALLATIONS
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(2) Any point of the span The condu
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Code 17 DISPLAY OF LABELS AND NOTIC
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Code 18 ALTERATIONS AND ADDITIONS 1
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Code 19 FIRST INSPECTION, TESTING A
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Code 20 PERIODIC INSPECTION, TESTIN
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(b) Examples of the above are dange
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Code 21 PROCEDURES FOR INSPECTION,
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21B Testing of Low Voltage Installa
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(6) Polarity (a) A test of polarity
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(d ) Secondary Injection Test (i) T
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will have affected the results of t
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142
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144
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146
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Code 22 MAKING AND KEEPING OF RECOR
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Checklists Requirements to be Used
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Code 23 & Code 24 (Reserved for Fut
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Part II Code 25 GENERAL WORKMANSHIP
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equipment should be suitable for th
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(2) Installation of PVC insulated,
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(c) Where cold compound with plasti
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(b) Earth continuity across joints
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Table 25(2) Spacing of Supports for
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166
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Code 26 REQUIREMENTS FOR SPECIFIC I
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Code 26 REQUIREMENTS FOR SPECIFIC I
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(iii) controls and switches of wate
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(vi) Except as provided by (vii) wh
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(b) Facilities should be incorporat
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(3) Starting facilities of electric
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than the product of the total stead
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(5) Transformers (a) Every transfor
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(b) Electrical apparatus and wiring
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(f ) Supply from generator set Wher
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manufacturer’s instructions. Othe
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• SELV, the source for SELV being
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protected by an RCD having the char
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(2) Basic protection and fault prot
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plug. The permanent connection to t
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prevent electric shock to electrica
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Table 26(1) Recommended Number of S
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202
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204
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APPENDICES 1. Prescribed Requiremen
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(d ) The spacing of the socket cont
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diameter of the clamping screw and
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214
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216
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contact with appropriate socket con
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(ii) between live parts and any oth
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222
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(1) General Appendix 3 Prescribed R
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(d ) An earthing terminal should be
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230
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232
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234
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Appendix 4 Prescribed Requirements
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(5) Screws and connections (a) Scre
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240
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250
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Appendix 5 Correction Factors for S
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(3) Correction factors for cables e
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Appendix 6 Current Carrying Capacit
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TABLE A6(1) Single-core PVC insulat
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TABLE A6(2) Multicore PVC insulated
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TABLE A6(3) Single-core armoured PV
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TABLE A6(4) Multicore armoured PVC
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TABLE A6(5) Single core XLPE insula
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TABLE A6(6) Multicore XLPE insulate
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TABLE A6(7) Single-core XLPE insula
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TABLE A6(8) Multicore armoured XLPE
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274
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276
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278
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280 Contactor Main make contact of
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282 Junction, connection point
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No. Symbol Description 45. 46. 47.
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No. Symbol Description 68. 69. 70.
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Appendix 10 Degree of Protection Pr
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Appendix 11 Forms of Internal Separ
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Appendix 12 Worked Examples for App
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Appendix 13 A) Schedule of Test Res
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(iii) All joints of metal conduit o
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Checklist No. 4—Additional Items
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(iv) Suitable stay wires installed
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Tested by/Date (N/A if not applicab
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(vii) Protective conductor up to an
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Checklist No. 5—Items for H.V. In
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IEC 60947 Low-voltage switchgear an
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BS 88 Part 6 Cartridge fuses for vo
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References may be made to the follo
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320
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(3) Precautions In the new colour c
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5.2 Single-phase installation Exten
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5.3 Three-phase installation Extens
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enclosure in conduit and trunking i
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Double insulation Duct Earth fault
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Joints and termination Labels bondi
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Socket outlets general installation
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Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

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