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

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Code 7 CURRENT DEMAND 7A Current Demand of a Circuit 7B Determination of Current Demand (1) General (2) For circuit supplying non-simultaneous or cyclic loads (3) For final circuits (4) For circuits supplying a number of final circuits 46
Code 7 CURRENT DEMAND 7A Current Demand of a Circuit The current rating of a circuit should not be less than the current demand of the circuit. 7B Determination of Current Demand (1) General The information and values given in this CoP for determination of current demand are intended for general guidance only as it is impossible to specify the appropriate allowances for diversity for every type of electrical installations. (2) For circuit supplying non-simultaneous or cyclic loads For a circuit having non-simultaneous or cyclic loads such that only one of these loads can be in use at any one time, the greatest of these loads should be used in calculating the current demand of the circuit. (3) For final circuits To determine the current demand of a final circuit, the following methods should be used: (a) For standard final circuits designed in accordance with Code 6, the current demand of the circuit concerned should be the same as the rating of the overcurrent protective device of the circuit. (b) The current demand of a final circuit other than subparagraph (a) should be assessed by summating the assumed current demands of current using equipment connected or intended to be connected as follows: (i) each socket outlet in a radial final circuit should be assumed to demand its rated current rating; (ii) lighting outlets should be assumed to demand the connected load with a minimum of 100W per lampholder; (iii) electric clock, shaver socket outlet, bell transformer, and current using equipment of a rating not greater than 5 VA may be neglected; (iv) discharge lighting should be assumed to have a demand in voltamperes of the rated lamp wattage multiplied by not less than 1.8. This multiplier is based upon the assumption that the circuit is corrected to a power factor of not less than 0.85 lagging, and takes into account control gear losses and harmonic currents; and (v) all other fixed equipment should be assumed to demand the rated or normal current. 47
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 12 and 13: ‘cable trunking’ means a manufa
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 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
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
Page 72: (Note: 1. An extraneous conductive
Page 76 and 77: (d ) Where a residual current devic
Page 78 and 79: (c) Values of k for protective cond
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 and 88: (4) Plate electrode Plate electrode
Page 89 and 90: Code 13 CONDUCTORS, JOINTS AND CONN
Page 91 and 92:
(a) the ambient temperature does no
Page 93 and 94:
(2) Identification of cable cores (
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Code 14 WIRING INSTALLATION ENCLOSU
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(b) Flexible steel conduits should
Page 99 and 100:
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
Page 190 and 191:
• SELV, the source for SELV being
Page 192 and 193:
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
Page 198 and 199:
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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206
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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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224
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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
Page 236 and 237:
Appendix 4 Prescribed Requirements
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(5) Screws and connections (a) Scre
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240
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242
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244
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246
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248
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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
Page 336 and 337:
Joints and termination Labels bondi
Page 338:
Socket outlets general installation
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Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

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