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

More documents

Recommendations

Info

Code 8 ISOLATION AND SWITCHING 8A Provision of Isolation and Switching (1) General installation (2) Appliance, equipment or luminaire (3) Unguarded moving parts (4) Electric motors (5) Switching off for mechanical maintenance (6) Emergency switching 8B Requirements of Isolation and Switching Devices (1) General (2) Isolating devices (3) Devices for switching off for mechanical maintenance (4) Devices for emergency switching 50
Code 8 ISOLATION AND SWITCHING 8A Provision of Isolation and Switching (1) General installation (a) An installation must be provided with a main switch or circuit breaker and a means of isolation to cut off all voltages. These two functions may be incorporated in a single device. The main switch or circuit breaker should interrupt all live conductors (i.e. phase and neutral conductors) and be capable of cutting off the full load current of the installation from supply. For a 3-phase 4-wire a.c. supply, a linked switch or linked circuit breaker may be arranged to disconnect the phase conductors only and in such case, a link should be inserted in the neutral conductor and securely fixed by bolts or screws. (b) For an installation serving more than one building, the installation inside separate buildings should be treated as a separate installation, and a separate main switch or circuit breaker and a separate means of isolation for each building are required as in subparagraph (a). (c) Every circuit or group of circuits must be provided with: (i) a means of isolation; and (ii) a means of interrupting the supply on load. (d ) Where a standby generator is installed, electrically and mechanically interlocked 4-pole changeover devices should be used for interconnection between the normal and standby sources to ensure that any neutral unbalance and fault current return to the correct source of supply. (e) Under no circumstances must a means of isolation or a switching device be provided in a protective conductor. (f ) A circuit breaker used to receive supply direct from the electricity supplier’s transformer should normally be of draw-out type. An isolator may be used in conjunction with a fixed type circuit breaker provided that it is mechanically interlocked with the circuit breaker. (2) Appliance, equipment or luminaire (a) An appliance, equipment or luminaire, other than that connected by means of a plug and socket outlet should be provided with a means of interrupting the supply on load. (b) For electric discharge lighting installation operating normally at an open-circuit voltage exceeding low voltage, an effective local means for isolation of the circuit from supply (such means being additional to the switch normally used for controlling the circuit) should be 51
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 47 and 48: Code 7 CURRENT DEMAND 7A Current De
Page 49: Purpose of Conductors or Switchgear
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 (
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
Page 138 and 139:
(d ) Secondary Injection Test (i) T
Page 140 and 141:
will have affected the results of t
Page 142 and 143:
142
Page 144 and 145:
144
Page 146 and 147:
146
Page 148 and 149:
Code 22 MAKING AND KEEPING OF RECOR
Page 150 and 151:
Checklists Requirements to be Used
Page 152 and 153:
Code 23 & Code 24 (Reserved for Fut
Page 154 and 155:
Part II Code 25 GENERAL WORKMANSHIP
Page 156 and 157:
equipment should be suitable for th
Page 158 and 159:
(2) Installation of PVC insulated,
Page 160 and 161:
(c) Where cold compound with plasti
Page 162 and 163:
(b) Earth continuity across joints
Page 164 and 165:
Table 25(2) Spacing of Supports for
Page 166 and 167:
166
Page 168 and 169:
Code 26 REQUIREMENTS FOR SPECIFIC I
Page 170 and 171:
Code 26 REQUIREMENTS FOR SPECIFIC I
Page 172 and 173:
(iii) controls and switches of wate
Page 174 and 175:
(vi) Except as provided by (vii) wh
Page 176 and 177:
(b) Facilities should be incorporat
Page 178 and 179:
(3) Starting facilities of electric
Page 180 and 181:
than the product of the total stead
Page 182 and 183:
(5) Transformers (a) Every transfor
Page 184 and 185:
(b) Electrical apparatus and wiring
Page 186 and 187:
(f ) Supply from generator set Wher
Page 188 and 189:
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
Page 194 and 195:
(2) Basic protection and fault prot
Page 196 and 197:
plug. The permanent connection to t
Page 198 and 199:
prevent electric shock to electrica
Page 200 and 201:
Table 26(1) Recommended Number of S
Page 202 and 203:
202
Page 204 and 205:
204
Page 206 and 207:
206
Page 208 and 209:
APPENDICES 1. Prescribed Requiremen
Page 210 and 211:
(d ) The spacing of the socket cont
Page 212 and 213:
diameter of the clamping screw and
Page 214 and 215:
214
Page 216 and 217:
216
Page 218 and 219:
contact with appropriate socket con
Page 220 and 221:
(ii) between live parts and any oth
Page 222 and 223:
222
Page 224 and 225:
224
Page 226 and 227:
(1) General Appendix 3 Prescribed R
Page 228 and 229:
(d ) An earthing terminal should be
Page 230 and 231:
230
Page 232 and 233:
232
Page 234 and 235:
234
Page 236 and 237:
Appendix 4 Prescribed Requirements
Page 238 and 239:
(5) Screws and connections (a) Scre
Page 240 and 241:
240
Page 242 and 243:
242
Page 244 and 245:
244
Page 246 and 247:
246
Page 248 and 249:
248
Page 250 and 251:
250
Page 252 and 253:
Appendix 5 Correction Factors for S
Page 254 and 255:
(3) Correction factors for cables e
Page 256 and 257:
Appendix 6 Current Carrying Capacit
Page 258 and 259:
TABLE A6(1) Single-core PVC insulat
Page 260 and 261:
TABLE A6(2) Multicore PVC insulated
Page 262 and 263:
TABLE A6(3) Single-core armoured PV
Page 264 and 265:
TABLE A6(4) Multicore armoured PVC
Page 266 and 267:
TABLE A6(5) Single core XLPE insula
Page 268 and 269:
TABLE A6(6) Multicore XLPE insulate
Page 270 and 271:
TABLE A6(7) Single-core XLPE insula
Page 272 and 273:
TABLE A6(8) Multicore armoured XLPE
Page 274 and 275:
274
Page 276 and 277:
276
Page 278 and 279:
278
Page 280 and 281:
280 Contactor Main make contact of
Page 282 and 283:
282 Junction, connection point
Page 284 and 285:
No. Symbol Description 45. 46. 47.
Page 286 and 287:
No. Symbol Description 68. 69. 70.
Page 288 and 289:
Appendix 10 Degree of Protection Pr
Page 290 and 291:
Appendix 11 Forms of Internal Separ
Page 292:
Appendix 12 Worked Examples for App
Page 296 and 297:
Appendix 13 A) Schedule of Test Res
Page 298 and 299:
(iii) All joints of metal conduit o
Page 303 and 304:
Checklist No. 4—Additional Items
Page 305 and 306:
(iv) Suitable stay wires installed
Page 307 and 308:
Tested by/Date (N/A if not applicab
Page 309 and 310:
(vii) Protective conductor up to an
Page 311:
Checklist No. 5—Items for H.V. In
Page 314 and 315:
IEC 60947 Low-voltage switchgear an
Page 316 and 317:
BS 88 Part 6 Cartridge fuses for vo
Page 318 and 319:
References may be made to the follo
Page 320:
320
Page 326 and 327:
(3) Precautions In the new colour c
Page 328 and 329:
5.2 Single-phase installation Exten
Page 330 and 331:
5.3 Three-phase installation Extens
Page 332 and 333:
enclosure in conduit and trunking i
Page 334 and 335:
Double insulation Duct Earth fault
Page 336 and 337:
Joints and termination Labels bondi
Page 338:
Socket outlets general installation
show all

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

Create successful ePaper yourself

Delete template?

Save as template?