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

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Code 13 CONDUCTORS, JOINTS AND CONNECTIONS 13A Selection and Sizing of Cable Conductors (1) General (2) Factors to be considered in sizing of cable conductors (3) Method of sizing cable conductors (4) Typical sizes of cable conductor used in general installations 13B Basic Protection (1) Protection by electrical insulation (2) Protection by other means 13C Joints and Connections 13D Other Requirements of Cables (1) Voltage grading of cables for low voltage application (2) Identification of cable cores (3) Identification of cables buried direct in ground 88
Code 13 CONDUCTORS, JOINTS AND CONNECTIONS 13A Selection and Sizing of Cable Conductors (1) General A conductor should have a current carrying capacity not less than the maximum current demand it normally carries, be capable of withstanding the prospective fault current, and suitable for operation in the environment and at the design voltage of the installation. (2) Factors to be considered in sizing of cable conductors In general, sizing of cable conductors should take into account the following factors: (a) the conductor material; (b) the insulating material; (c) the ambient temperature in which the cable is installed; (d ) the method of installation; (e) whether or not the cable is affected by thermal insulating material; ( f ) the use and type of protective device; (g) the voltage drop from the origin of the circuit to the load; and (h) for Category 1 circuits, live conductors should have a cross-sectional area: (i) not less than 1.5 mm2 for surface wiring using PVC insulated PVC sheath copper cables; (ii) not less than 1.0 mm2 for single core PVC insulated copper cables installed in conduit, duct, ducting or trunking; (iii) not less than 16 mm2 for aluminium conductors; (iv) not less than 0.5 mm2 for flexible cables and flexible cords. (3) Method of sizing cable conductors (a) In determining the size of cable conductors to be used, the steps employed, in general, are as follows: (i) Determine the design current of the circuit under consideration. (ii) Choose a suitable overcurrent protective device (refer to Code 9). 89
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CODE OF PRACTICE FOR THE ELECTRICIT
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Page 6G Final Circuits Using 16A In
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Page 17. Display of Labels and Noti
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Page Appendices 208 1. Prescribed R
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Code 1 INTRODUCTION PART I This Cod
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‘cable trunking’ means a manufa
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‘powertrack system’ means an as
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Code 3 APPLICATION 3A General Appli
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Code 4 GENERAL SAFETY REQUIREMENTS
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warning notices and the placing of
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4E Working Space (a) A minimum clea
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Additional lighting should be provi
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(b) Work procedure for High Voltage
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(ii) Keep hands away from any circu
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Code 5 SEGREGATION OF CIRCUIT CATEG
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(i) A minimum horizontal or vertica
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Code 6 CIRCUIT ARRANGEMENT 6A Divis
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(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
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Page 58 and 59: Code 9 OVERCURRENT PROTECTIVE DEVIC
Page 60 and 61: Overload protective devices may hav
Page 62 and 63: Table 9(1) Limiting Final Temperatu
Page 64 and 65: Table 9(4) Classification of MCB to
Page 66 and 67: Code 10 NEUTRAL CONDUCTOR PROTECTIV
Page 68 and 69: Code 11 EARTH LEAKAGE AND EARTH FAU
Page 70 and 71: (b) Subject to subparagraph (a) abo
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Page 76 and 77: (d ) Where a residual current devic
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Page 80 and 81: Table 11(4) Minimum Cross-sectional
Page 82: Table 11(11) Maximum Earth Fault Lo
Page 85 and 86: Code 12 EARTHING ARRANGEMENT 12A Ge
Page 87: (4) Plate electrode Plate electrode
Page 91 and 92: (a) the ambient temperature does no
Page 93 and 94: (2) Identification of cable cores (
Page 95 and 96: Code 14 WIRING INSTALLATION ENCLOSU
Page 97 and 98: (b) Flexible steel conduits should
Page 99 and 100: 14E Cable Capacity of Enclosures (1
Page 101 and 102: Table 14(2) Cable Factors and Condu
Page 103 and 104: Table 14(4) Cable Factors and Trunk
Page 105 and 106: Code 15 ADVERSE CONDITIONS INSTALLA
Page 107 and 108: (c) Where cables are to be connecte
Page 109 and 110: (d ) Electrical equipment and wirin
Page 111 and 112: (b) There should be adequate means
Page 114 and 115: Table 15(4) Selection of Electrical
Page 116 and 117: Code 16 OVERHEAD LINE INSTALLATIONS
Page 118 and 119: (2) Any point of the span The condu
Page 120: Code 17 DISPLAY OF LABELS AND NOTIC
Page 124 and 125: Code 18 ALTERATIONS AND ADDITIONS 1
Page 126 and 127: Code 19 FIRST INSPECTION, TESTING A
Page 128 and 129: Code 20 PERIODIC INSPECTION, TESTIN
Page 130 and 131: (b) Examples of the above are dange
Page 132 and 133: Code 21 PROCEDURES FOR INSPECTION,
Page 134 and 135: 21B Testing of Low Voltage Installa
Page 136 and 137: (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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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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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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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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contact with appropriate socket con
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(ii) between live parts and any oth
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(1) General Appendix 3 Prescribed R
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(d ) An earthing terminal should be
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Appendix 4 Prescribed Requirements
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(5) Screws and connections (a) Scre
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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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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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(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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