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CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)1

COÂNG TY COÅ PHAÀN DAÂY CAÙP ÑIEÄN VIEÄT NAM (CADIVI)

HÖÔÙNG DAÃN LÖÏA CHOÏNVAØ SÖÛ DUÏNG CAÙP HAÏ THEÁ

CAÙCH ÑIEÄNPVC HOAËC XLPE

INSTRUCTION OF CHOOSING AND USING OFLOW VOLTAGE CABLES, PVC OR XLPE INSULATED


HÖÔÙNG DAÃN LÖÏA CHOÏN VAØ SÖÛ DUÏNG CAÙP HAÏ THEÁCAÙCH ÑIEÄN PVC HOAËC XLPE

INSTRUCTION OF CHOOSING AND USING OFLOW VOLTAGE CABLES, PVC OR XLPE INSULATED

________________________________________________________________________________________A/ CHOÏN TIEÁT DIEÄN RUOÄT DAÃN:Khi choïn caùp, khaùch haøng caàn xem xeùt nhöõng yeáutoá sau:- Doøng ñieän ñònh möùc- Ñoä suït aùp- Doøng ñieän ngaén maïch- Caùch laép ñaët- Nhieät ñoä moâi tröôøng hoaëc nhieät ñoä ñaát

I/ CAÙP ÑIEÄN LÖÏCI.1/ CAÙP CAÙCH ÑIEÄN PVCI.1.1/ Doøng ñieän ñònh möùc:Doøng ñieän chaïy trong ruoät caùp thì seõ sinh nhieät laømcho caùp noùng leân. Khi nhieät ñoä caùp vöôït quaù möùccho pheùp thì phaûi choïn caùp coù tieát dieän ruoät daãn lôùnhôn.Caùc baûng veà doøng ñieän ñònh möùc sau ñaây döïa treân :- Nhieät ñoä laøm vieäc cho pheùp toái ña cuûa ruoät daãn.- Nhieät ñoä khoâng khí- Nhieät ñoä ñaát- Nhieät trôû suaát cuûa ñaát.- Ñoä saâu laép ñaët (khi choân caùp trong ñaát)- Ñieàu kieän laép ñaëtI.1.1.1/ Caùp treân khoângCaùp laép treân khoâng ña soá laø trong caùc toøa nhaø neândoøng ñieän ñònh möùc ñöôïc tính vôùi nhieät ñoä khoângkhí laø 300C, caùp khoâng bò naéng roïi tröïc tieáp vaøkhoâng khí löu thoâng töï do.Khi caùp bò naéng roïi tröïc tieáp, doøng ñieän ñònh möùcseõ giaûm ñi.Doøng ñieän ñònh möùc trong caùc baûng 1,2,3,4 cho caùplaép ñaët trong caùc ñieàu kieän nhö sau :

a) Caùp moät loõi : 2 hoaëc 3 sôïi caùp moät loõi laép theo moät maët ñöùng,treân töôøng hay trong möông caùp hôû. khoaûng caùch töøtöôøng ñeán beà maët caùp phaûi lôùn hôn hoaëc baèng20mm, khoaûng caùch taâm 2 sôïi caùp keà nhau baèng 2laàn ñöôøng kính cuûa caùp.Vôùi 2 caùp 1 loõi, doøng ñieän ñònh möùc ñöôïc aùp duïngan toaøn cho tröôøng hôïp 2 sôïi caùp laép ñaët treân caùcthanh ngang coá ñònh treân töôøng, khoaûng caùch giöõataâm 2 sôïi caùp nhö treân, hoaëc caùp tieáp xuùc nhau suoátchieàu daøi caùp. Vôùi 3 caùp 1 loõi laép ñaët theo hình 3 laù, theo maëtñöùng coá ñònh treân töôøng hay trong maùng caùp hôû,khoaûng caùch tính töø töôøng ñeán beà maët caùp phaûi lôùnhôn hoaëc baèng 20mm.b) Caùp nhieàu loõi :Khoâng nhö caùp moät loõi, caùp nhieàu loõi ñöôïc laép ñaëtñôn leû theo moät maët ñöùng coá ñònh treân töôøng hay

A/ SELECTION OF CROSS-SECTIONNALAREA OF CONDUCTOR:In order to choose the right power cable, one has to consider:- The current rating- The voltage drop- The short circuit rating- The installation methods- The ambient temperature or ground temperature

I/ POWER CABLEI.1/ PVC INSULATED POWER CABLEI.1.1/ Current ratingWhen electric current flows through the conductor of a cable theelectrical resistance of the conductor generates heat. When atemperature greater than that allowed is reached by the cable due toheat generation, a larger conductor size (with lower electricalresistance ) has to be selected.The current rating depends on the following factors:.- Maximum operating temperature of conductor- Ambient air temperature- Ground temperature- Soil thermal resistivity- Depth of laying ( for cable laid direct in the ground)- Conditions of the installationI.1.1.1/ Cables installed in air:It is anticipated that many of the “in air” installation will be inbuildings, and the ratings are therefore given on the basis of anambient air temperature of 300CIt should be noted that all ratings for cables run in free air havebeen based on the assumption that they are shielded from the directrays of the sun without restriction of ventilation. The ratings forcables subjected to solar radiation should be reduced to takeaccount of this factorThe ratings given in Tables 1,2,3,4 are for cables installed underdefined conditionsa) Single core cables Two or three single core cables are installed one above the other,fixed to the vertical surface of a wall or open cable trench asfollows, the distance being at least 20 mm in each instance.Cables are installed at a distance between centres of twice theoverall diameter of the cable.The ratings for two cables may be applied with safety in instanceswhere such cables are installed in horizontal formation on bracketsfixed to a wall, either spaced as indicated above, or touchingthroughout. Three single core cables are installed in trefoil formation, fixedto the vertical surface of a wall or open cable trench, the cablestouching throughout and the distance between the wall and thesurface of the nearest cable being at least 20 mm.The cables are assumed to be remote from iron, steel, or ferro-concrete, other than the cable supports.(b) Multicore cablesCables of all types other than single core cables are installed singly,fixed to the vertical surface of a wall or open cable trench, the


trong möông caùp hôû, khoaûng caùch töø töôøng ñeán beàmaët caùp phaûi lôùn hôn hoaëc baèng 20mm.Neáu nhaát thieát phaûi laép ñaët caùp vôùi khoaûng caùchnhoû hôn qui ñònh thì soá lieäu seõ cho rieâng trong caùcbaûng coù tieâu ñeà "Clipped direct to a surface. ."theo IEE

distance between the surface of the cable and the wall being at least20 mm in every instance.If it is necessary for cables to be installed at distances less thanthose described above, then the values tabulated under the heading.""Clipped direct to a surface. . in the IEE Wiring Regulations shouldbe employed.

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät nhoâm , caùch ñieän PVC, voû PVC coù giaùp baûo veä, laép treân khoângCurrent ratings and Voltage drop for Alluminium conductors, PVC insulated, armoured, PVC oversheathed cables,Installed in air

Baûng 1 ( Table 1)

Tieát dieänruoät daãnNominalarea of

conductor

1 loõi (Single core ) 2 loõiTwo core

3 vaø 4 loõiThree and four core2 caùp ñaët caùch khoaûng

Two cables spaced3 caùp tieáp xuùc nhau theo

hình 3 laùThree cables trefoil touching

Doøng ñieänñònh möùcCurrentratings

Ñoä suït aùpApproximatevolt drop per

amp per metre



amp per metre



amp per metre



amp per metremm2 A mV A mV A mV A mV

16 80 4.7 65 4.0 72 4,6 61 4,025 109 3.1 85 2.5 92 2,9 80 2,535 131 2.2 110 1.8 113 2,1 98 1,850 159 1,6 133 1,3 136 1,5 120 1,870 200 1,1 166 0,94 173 1,1 151 0,9395 245 0,82 205 0,69 213 0,79 188 0,68120 280 0,68 239 0,56 - - 218 0,54150 325 0,57 272 0,46 - - 248 0,45185 371 0,49 317 0,38 - - 288 0,37240 437 0,41 375 0,31 - - 344 0,29300 498 0,37 431 0,27 - - 396 0,25380 559 0,34 497 0,24 - - - -480 629 0,31 569 0,21 - - - -600 697 0,29 637 0,19 - - - -740 770 0,28 719 0,18 - - - -960 832 0,27 803 0,17 - - - -1200 902 0,27 884 0,16 - - - -

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät nhoâm , caùch ñieän PVC, voû PVC khoâng giaùp baûo veä, laép treân khoângCurrent ratings and Voltage drop for Alluminium conductors, PVC insulated, unarmoured, PVC oversheathed cablesInstalled in air

Baûng 2 ( Table 2)

Tieát dieänruoät daãn

Nominalarea of

conductor

1 loõi (Single core) 2 loõiTwo core


Two cables spaced3 caùp (Three cables)

Tieáp xuùc nhau theo hình 3 laùTrefoil touching

Treân cuøng maët phaúng vaøcaùch khoaûng

Laid flat spacedDoøng ñieänñònh möùcCurrentratings


amp per metre



amp per metre



amp per metre



amp per metre



amp per metremm2 A mV A mV A mV A MV

16 78 4,7 64 4,0 76 4,0 70 4,6 59 4,025 105 3,1 83 2,5 101 2,5 90 2,9 78 2,535 128 2,2 105 1,8 123 1,8 110 2,1 96 1,850 153 1,6 129 1,3 149 1,3 134 1,5 117 1,370 194 1,1 164 0,94 189 0,95 169 1,1 149 0,9395 241 0,81 202 0,68 234 0,70 209 0,79 183 0,68120 281 0,66 236 0,55 273 0,58 - - 212 0,54150 324 0,56 271 0,46 313 0,49 - - 243 0,45185 373 0,47 315 0,37 364 0,42 - - 281 0,37240 446 0,40 376 0,30 434 0,40 - - 336 0,29300 515 0,35 436 0,26 503 0,36 - - 387 0,25380 601 0,32 509 0,22 588 0,33 - - - -480 697 0,29 591 0,20 682 0,30 - - - -600 798 0,28 674 0,18 781 0,28 - - - -740 923 0,27 776 0,17 903 0,26 - - - -960 1091 0,26 810 0,15 1068 0,24 - - - -1200 1247 0,25 1028 0,15 1221 0,23 - - - -


Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng, caùch ñieän PVC, voû PVC coù giaùp baûo veä, laép treân khoângCurrent ratings and Voltage drop for Copper conductors, PVC insulated, armoured, PVC oversheathed cablesInstalled in air

Baûng 3 ( Table 3)Tieát dieänruoät daãn

Nominalarea of

conductor







amp per metre



amp per metre



amp per metre




1,5 26 33 24 26 23 29 20 252,5 33 21 29 16 31 17 26 154 50 12 39 9,7 41 11 36 9,56 62 8,0 44 6,5 53 7,4 45 6,410 80 4,8 64 3,8 72 4,4 62 3,816 108 3,2 88 2,3 96 2,8 82 2,425 140 1,9 121 1,5 128 1,7 109 1,535 170 1,4 150 1,1 156 1,3 133 1,150 217 0,98 181 0,82 189 0,94 162 0,8270 271 0,71 228 0,58 237 0,66 205 0,5795 332 0,54 280 0,44 293 0,49 252 0,42120 383 0,46 326 0,36 338 0,40 291 0,35150 431 0,41 371 0,31 384 0,34 334 0,29185 489 0,37 425 0,27 445 0,29 383 0,25240 568 0,33 500 0,23 525 0,24 451 0,21300 640 0,31 571 0,20 598 0,21 514 0,18400 707 0,29 649 0,19 685 0,19 589 0,17500 777 0,28 729 0,18 - - - -630 856 0,27 817 0,16 - - - -800 905 0,26 881 0,16 - - -1000 967 0,26 949 0,15 - - - -

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän PVC, voû PVC khoâng giaùp baûo veä, laép treân khoângCurrent ratings and Voltage drop for Copper conductors, PVC insulated, unarmoured, PVC oversheathed cablesInstalled in air


Nominalarea of

conductor



Two cables spaced3 caùp (Three cables)

Tieáp xuùc nhau theo hình laùTrefoil touching

Treân cuøng moät maët phaúngvaø caùch khoaûngLaid flat spaced



amp per metre



amp per metre



amp per metre



amp per metre



amp per metremm2 A mV A mV A mV A mV A mV

1,5 24 30 21 26 23 26 22 27 19 242,5 31 19 27 14 30 15 29 16 24 134 45 10 36 9,5 43 9,5 38 10 32 96 58 6 40 7,5 50 6,8 45 7 38 610 76 4,1 58 3,8 70 3,8 68 4 55 3,316 101 3,0 85 2,4 95 2,5 91 2,8 79 2,425 135 1,8 118 1,5 128 1,7 122 1,7 103 1,535 169 1,4 145 1,1 160 1,2 149 1,3 128 1,150 207 0,97 173 0,82 201 0,83 182 0,94 156 0,8270 262 0,70 219 0,58 255 0,60 229 0,66 197 0,5795 325 0,53 273 0,43 317 0,47 284 0,49 243 0,42120 379 0,45 318 0,35 368 0,40 330 0,40 284 0,35150 435 0,39 365 0,30 424 0,35 379 0,34 324 0,29185 504 0,35 423 0,25 492 0,33 436 0,29 374 0,25240 602 0,31 505 0,22 588 0,32 519 0,24 446 0,21300 697 0,29 583 0,19 681 0,31 598 0,21 572 0,18400 815 0,28 679 0,18 796 0,28 695 0,19 593 0,17500 948 0,26 782 0,16 927 0,27 - - - -630 1108 0,25 900 0,15 1083 0,25 - - - -800 1277 0,25 1080 0,15 1249 0,23 - - - -1000 1437 0,24 1134 0,14 1412 0,22 - - - -


Thoâng soá laép ñaët :Nhieät ñoä khoâng khí 300CNhieät ñoä ruoät daãn toái ña khi caùp taûi doøng ñieän ñònhmöùc 700CChæ neân cho caùp lieân tuïc mang ñuû doøng ñieän ñònh möùckhi doøng ñieän toái thieåu cuûa maïch baûo veä khoâng vöôïtquaù 1,45 laàn doøng ñieän ñònh möùc.Vieäc laép ñaët nhieàu sôïi caùp seõ khoâng laøm giaûm doøngñieän ñònh möùc neáu:- Khoaûng caùch ngang giöõa caùc maïch ñieän khoâng

nhoû hôn 2 laàn ñöôøng kính moät sôïi caùp- Khoaûng caùch doïc giöõa caùc maïch ñieän khoâng nhoû

hôn 4 laàn ñöôøng kính moät sôïi caùp- Neáu coù hôn 3 maïch ñieän thì laép chuùng naèm ngang.

Basic assumptions and conditions of installationAmbient air temperature 300CMaximum conductor operating temperature at rated current 700CCables shall only be continuously operated at their full rating if theminimun current at which circuit protection is designed to operatedoes not exceed 1,45 times the values tabulated.Effect of grouping of cables: no reduction in rating is necessaryproviding that:- The horizontal clearance between circuits is not less than twice

the overall diameter of an individual cable.- The vertical clearance between circuits is not less than 4 times

the diameter of an individual cable- If the number of circuits exceeds 3, they are installed in a

horizontal plane

Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä khoâng khí thay ñoåiRating factors for other ambient air temperatures

Baûng 5 (Table 5)Nhieät ñoä moâi tröôøngAmbient air temperature

25 35 40 45 50 55

Heä soá hieäu chænhRating factor

1,06 0,94 0,87 0,79 0,70 0,61

I.1.1.2/ Caùp choân tröïc tieáp trong ñaát I.1.1.2/ Cables laid direct in ground

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät nhoâm, caùch ñieän PVC, voû PVC, coù giaùp baûo veä, choân trong ñaátCurrent ratings and Voltage drop for Alluminium conductors, PVC insulated, armoured, PVC oversheathed cablesLaid direct in ground


Nominalarea of

conductor







amp per metre



amp per metre



amp per metre




16 98 4,7 76 4,0 91 4,6 77 4,025 122 3,1 102 2,5 118 2,9 100 2,535 148 2,2 125 1,8 142 2,1 120 1,850 180 1,6 154 1,3 168 1,5 143 1,370 221 1,1 188 0,92 209 1,1 176 0,9395 265 0,80 226 0,68 250 0,79 213 0,68120 302 0,64 257 0,55 - - 243 0,54150 338 0,54 288 0,46 - - 272 0,45185 382 0,44 326 0,38 - - 309 0,37240 442 0,36 377 0,31 - 360 0,29300 498 0,31 424 0,26 - - 407 0,25380 558 0,27 475 0,23 - - - -480 626 0,24 532 0,21 - - - -600 691 0,22 586 0,19 - - - -740 764 0,21 648 0,18 - - - -960 829 0,19 701 0,17 - - - -1200 895 0,18 755 0,16 - - - -


Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän PVC, voû PVC coù giaùp baûo veä, choân trong ñaátCurrent ratings and Voltage drop for Copper conductors, PVC insulated, armoured, PVC oversheathed cables,Laid direct in ground


Nominalarea of

conductor




hình 3 laùTrefoil touching



amp per metre



amp per metre



amp per metre




1,5 33 32 29 25 32 29 27 252,5 44 20 38 15 41 17 35 154 59 11 53 9,5 55 11 47 9,56 75 9 66 6,4 69 7,4 59 6,410 101 4,8 86 3,8 92 4,4 78 3,816 128 3,2 110 2,4 119 2,8 101 2,425 168 1,9 142 1,5 158 1,7 132 1,535 201 1,4 170 1,1 190 1,3 159 1,150 238 0,97 203 0,82 225 0,94 188 0,8270 292 0,67 248 0,58 277 0,66 233 0,5795 349 0,50 297 0,44 332 0,49 279 0,42120 396 0,42 337 0,36 377 0,40 317 0,35150 443 0,36 376 0,31 422 0,34 355 0,29185 497 0,31 423 0,27 478 0,29 401 0,25240 571 0,26 485 0,23 561 0,24 462 0,21300 640 0,23 542 0,20 616 0,21 517 0,18400 708 0,22 600 0,19 693 0,19 580 0,17500 780 0,20 660 0,18 - - - -630 856 0,19 721 0,16 - - - -800 895 0,18 756 0,16 - - - -1000 939 0,18 797 0,15 - - - -

Thoâng soá laép ñaët :Nhieät trôû suaát cuûa ñaát : 1,2 0Cm/WNhieät ñoä ñaát : 150CÑoä saâu choân caùp : 0,5m (tính ñeán taâmcuûa caùp hoaëc taâm cuûa nhoùm caùp hình 3 laù)Nhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 700CChæ neân cho caùp lieân tuïc mang ñuû doøng ñieän ñònhmöùc khi doøng ñieän toái thieåu cuûa maïch baûo veä khoângvöôït quaù 1,3 laàn doøng ñieän ñònh möùc.

Heä soá hieäu chænhDoøng ñieän ñònh möùc cuûa caùp choân tröïc tieáp trong ñaátphuï thuoäc vaøo nhieät ñoä ñaát vaø nhieät trôû suaát cuûa ñaát.Heä soá hieäu chænh trong baûng 8 duøng ñeå hieäu chænhdoøng ñieän ñònh möùc theo söï thay ñoåi cuûa nhieät ñoäñaát.Khi nhöõng ñieàu kieän hoaït ñoäng cuûa caùp ñöôïc xaùcñònh moät caùch chính xaùc, vaø coù hieåu bieát veà ñaát suoátcaû loä trình ñi caùp, khaùch haøng coù theå xaùc ñònh doøngñieän ñònh möùc moät caùch chính xaùc hôn qua söû duïngheä soá nhieät trôû suaát cuûa ñaát, heä soá gheùp nhoùm, heä soáñieàu chænh theo ñoä saâu ñaët caùp… trong caùc baûng8,9,10,11,12.

Basic assumptions and conditions of installationGround thermal resistivity 1.2 0C m/WGround temperature 15 0CDepth of laying 0,5 metre (to the centre of cable or trefoil groupof cables)Maximum operating conductor temperature at rated current: 700C.Cables shall only be continuously operated at their full rating if theminimum current at which circuit protection is designed to operatedoes not exceed 1,3 times the values tabulated.

Rating factorsRatings for cables installed direct in the ground are based onvalues of soil temperature and soil thermal resistivity

Rating factors to take account of variation in ground temperatureare given with the current rating tables. Where conditions ofoperation can be fairly accurately estimated, and knowledge of thesoil along the route is available, it is possible to determine theratings more precisely by the use of the soil thermal resistivityfactors, grouping factors and factors for the depths of laying givenin Tables 8 to 12.

Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä ñaát thay ñoåiRating factors for other ground temperatures

Baûng 8 (Table 8)Nhieät ñoä ñaátGround temperature (0C)

20 25 30 35 40 45


0,95 0,90 0,85 0,80 0,74 0,67


Heä soá hieäu chænh doøng ñònh möùc khi giaù trò nhieät trôû suaát cuûa ñaát thay ñoåiRating factors for variation in thermal resistivity of soil

Baûng 9 (Table9)Loaïi vaø côõ caùpType & Size of cable (mm2)

Nhieät trôû suaát cuûa ñaátSoil thermal resistivity in 0Cm/W

0,8 0,9 1,0 1,5 2,0 2,5Caùp moät ruoät (Single core cables)Döôùi 150 (Up to 150)Töø 185 ñeán 300 (From 185 to 300)Töø 380 ñeán 1200 (From 380 to 1200)

1,161,171,17

1,121,121,12

1,071,071,07

0,910,910,91

0,810,800,80

0,730,730,73

Caùp nhieàu ruoät (Multicore cables)Döôùi 16 (Up to 16)Töø 25 ñeán 150 (From 25 to 150)Töø 185 ñeán 400 (From 185 to 400)

1,121,141,16

1,081,101,10

1,051,061,07

0,930,920,92

0,840,820,81

0,770,750,74

Heä soá hieäu chænh doøng ñònh möùc khi ñoä saâu choân caùp thay ñoåiRating factors for depth of laying ( to centre of cable or trefoil group of cables)

Baûng 10 (Table 10)Ñoä saâu ñaët caùpDepth of laying

(m)

600/1000 VDöôùi 50 mm2

(Up to 50mm2)70 ñeán 300 mm2

(70 to 300 mm2)Treân 300 mm2

(Above 300 mm2)

0,50 1,00 1,00 1,000,60 0,99 0,98 0,970,80 0,97 0,96 0,941,00 0,95 0,93 0,921,25 0,94 0,92 0,891,50 0,93 0,90 0,871,75 0,92 0,89 0,862,00 0,91 0,88 0,852,50 0,90 0,87 0,843,00 hoaëc hôn(3,00 or more)

0,89 0,86 0,82

Ñoä saâu choân caùp tính ñeán taâm cuûa caùp hay taâm cuûa nhoùm caùp hình 3 laùDepth of laying : to centre of cable or trefoil group of cables

Heä soá hieäu chænh doøng ñònh möùc khi gheùp nhoùm caùp 1 loõi , ñaët theo hình ba laù hay treân maët phaúng ngangGroup rating factors for circuits of three single core cables, in trefoil or laid in flat touching, horizontal formation

Baûng 11 (Table 11)

Soá maïch(Number

of circuits)

Khoaûng caùch ( Spacing) (m)Tieáp xuùc tröïc tieáp (Touching) 0,15 0,3 0,45 0,6

Xeáp theo hìnhba laù (Trefoil )

Xeáp treân maët phaúng(Laid flat )

2 0,78 0,81 0,83 0,88 0,91 0,933 0,66 0,70 0,73 0,79 0,84 0,874 0,61 0,64 0,68 0,73 0,81 0,855 0,56 0,60 0,64 0,73 0,79 0,856 0,53 0,57 0,61 0,71 0,78 0,82

spacing Spacing*


Heä soá hieäu chænh doøng ñònh möùc cuûa caùp nhieàu loõi ñaët treân maët phaúng ngangGroup rating factors for Multicore cables in horizontal formation


Soá caùp trong moätnhoùm

(Number of cables ingroup )

Khoaûng caùch ( Spacing) (m)Tieáp xuùc tröïc tieáp

(Touching)0,15 0,3 0,45 0,6

2 0,81 0,87 0,91 0,91 0,953 0,70 0,78 0,84 0,84 0,904 0,63 0,74 0,81 0,81 0,895 0,59 0,70 0,78 0,78 0,876 0,55 0,68 0,77 0,77 0,87

I.1.1.3/ Caùp ñi trong oáng ñôn tuyeán choân trong ñaát I.1.1.3/ Cable run in single way ducts

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät nhoâm, caùch ñieän PVC, voû PVC, coù giaùp baûo veä, ñi trong oáng ñôntuyeán choân trong ñaát(Current ratings and Voltage drop for Alluminium conductors, PVC insulated, armoured, PVC oversheathed cables,Run in single way ducts)

Baûng 13 ( Table 13 )Tieát dieänruoät daãn

Nominalarea of

conductor


3 vaø 4 loõiThree and four core2 caùp : oáng tieáp xuùc nhau

Two cables : ducts touching3 caùp: oáng xeáp theo hình ba laù tieáp

xuùc nhauThree cables: ducts trefoil touching



amp per metre



amp per metre



amp per metre



amp per metremm2 A mV A MV A mV A mV

16 87 4,7 78 4,2 75 4,6 62 4,025 115 3,1 100 2,6 96 2,9 81 2,535 140 2,2 123 1,9 115 2,1 97 1,850 166 1,6 154 1,4 137 1,5 116 1,370 204 1,2 188 1,0 170 1,1 144 0,9395 241 0,88 222 0,76 204 0,79 174 0,68120 274 0,74 252 0,64 - - 199 0,54150 306 0,64 280 0,55 - - 223 0,45185 335 0,55 306 0,48 - - 254 0,37240 381 0,48 347 0,41 - - 298 0,29300 423 0,43 384 0,37 - - 338 0,25380 455 0,39 411 0,34 - - - -480 498 0,36 449 0,31 - - - -600 538 0,34 483 0,29 - - - -740 584 0,32 523 0,27 - - - -960 619 0,29 550 0,25 - - - -1200 664 0,28 558 0,24 - - - -

spacing


Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän PVC, voû PVC, coù giaùp baûo veä, ñi trong oáng ñôntuyeán choân trong ñaátCurrent ratings and Voltage drop for Copper conductors, PVC insulated, armoured, PVC oversheathed cables,Run in single way ducts

Baûng 14 ( Table 14 )Tieát dieänruoät daãn

Nominalarea of

conductor


3 vaø 4 loõiThree and four core2 caùp : oáng tieáp xuùc nhau

Two cables : ducts touching3 caùp: oáng xeáp theo hình ba laù tieáp

xuùc nhauThree cables: ducts trefoil touching



amp per metre



amp per metre



amp per metre




1,5 30 34 28 27 26 29 22 252,5 41 22 35 16 34 17 29 154 59 12 48 10.5 45 11 38 9,56 69 10 60 7.0 57 7,4 48 6,410 90 5.0 84 4.0 76 4,4 64 3,816 114 3.4 107 2.6 98 2,8 83 2,425 150 2.0 139 1.6 129 1,7 107 1,535 175 1.4 168 1.2 154 1,3 129 1,150 216 1,0 199 0,88 183 0,94 153 0,8270 262 0,76 241 0,66 225 0,66 190 0,5795 308 0,61 282 0,53 271 0,49 228 0,42120 341 0,54 311 0,47 309 0,40 260 0,35150 375 0,48 342 0,42 346 0,34 292 0,29185 414 0,44 375 0,38 393 0,29 331 0,25240 463 0,40 419 0,34 455 0,24 382 0,21300 509 0,37 459 0,32 510 0,21 428 0,18400 545 0,34 489 0,30 574 0,19 490 0,17500 585 0,32 523 0,28 - - - -630 632 0,30 563 0,26 - - - -800 662 0,28 587 0,25 - - - -1000 703 0,27 621 0,23 - - - -

Thoâng soá laép ñaët :Nhieät trôû suaát cuûa ñaát: 1,20Cm/WNhieät ñoä ñaát : 150CÑoä saâu choân caùp : 0,5m (tính ñeán taâm cuûa oáng ñônchöùa caùp hoaëc taâm cuûa moät nhoùm oáng hình ba laùchöùa caùp)Nhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 700CChæ neân cho caùp lieân tuïc mang ñuû doøng ñieän ñònh möùckhi doøng ñieän toái thieåu cuûa maïch baûo veä khoâng vöôïtquaù 1,45 laàn doøng ñieän ñònh möùc.Caùch laép ñaët :Thuaät ngöõ “oáng” ñeå chæ caùc loaïi oáng baèng ñaát nung,baèng sôïi hoaëc baèng theùp. Khoâng söû duïng oáng theùpcho caùp moät loõi trong löôùi ñieän xoay chieàu. Moãi oángchæ chöùa moät sôïi caùp

Basic assumptions and conditions of installationGround thermal resistivity 1.2 0C m/WGround temperature 15 0CDepth of laying 0. 5 metre (to the centre of duct ortrefoil group of ducts group of cables)Maximum operating conductor temperature at rated current 700C

Cables shall only be continuously operated at their full rating if theminimum current at which circuit protection is designed to operatedoes not exceed 1,45 times the values tabulatedMethod of installation:The 'term" applies to a single earthenware, fibre or ferrous pipeexcept that in the case of single core cables for use in ac systems,ferrous ducts should not be employed. Rating are given for ductscontainning one cable each.

Kích thöôùc oáng theo ñöôøng kính caùp ( Size of duct are based on values of Cable overall diameter)Baûng 15 (Table 15)

Ñöôøng kính toång cuûa caùpCable overall diameter (mm)

Kích thöôùc oáng (Size of duct)Ñöôøng kính trongInside diameter (mm)

Ñöôøng kính ngoaøiOutside diameter (mm)

Nhoû hôn hoaëc baèng 65Up to and including 65

100 130

Töø 65 ñeán 90Above 65 up to and including 90

125 160


Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä ñaát thay ñoåi.Rating factors for other ground temperatures

Baûng 16 (Table 16 )Nhieät ñoä ñaátGround temperature (0C)

20 25 30 35 40 45


0,95 0,90 0,85 0,80 0,74 0,67

Heä soá hieäu chænh doøng ñònh möùc khi giaù trò nhieät trôû suaát cuûa ñaát thay ñoåi.Rating factors for variation in thermal resistivity of soil

Baûng 17 (Table17)Loaïi vaø côõ caùpType &Size of cable (mm2)

Nhieät trôû suaát cuûa ñaátSoil thermal resistivity in 0Cm/W

0,8 0,9 1,0 1,5 2,0 2,5Caùp moät ruoät (Single core cables)Döôùi 185 (Up to 185)Töø 185 ñeán 300 (From 185 to 300)Töø 300 ñeán 1200 (From 300 to 1200)

1,101,111,12

1,071,081,08

1,041,051,05

0,940,930,93

0,860,850,84

0,800,790,78

Caùp nhieàu ruoät (Multicore cables)Döôùi 25 (Up to 25)Töø 25 ñeán 185 (From 25 to 185)Töø 185 ñeán 400 (From 185 to 400)

1,041,061,07

1,031,041,05

1,021,031,03

0,970,950,95

0,920,900,88

0,880,850,83

Heä soá hieäu chænh doøng ñònh möùc khi ñoä saâu choân caùp thay ñoåi.Rating factors for depth of laying

Baûng 18 (Table 18)Ñoä saâu ñaët caùpDepth of laying

(m)

600/1000 VCaùp moät loõi(Single core)

Caùp nhieàu loõi(Multicore )

0,50 1,00 1,000,60 0,98 0,990,80 0,95 0,961,00 0,93 0,981,25 0,91 0,961,50 0,89 0,951,75 0,88 0,942,00 0,87 0,932,50 0,86 0,923,00 hoaëc hôn(3,00 or more)

0,85 0,91

Ñoä saâu choân caùp tính töø taâm cuûa oáng ñôn chöùa caùp hay taâm cuûa nhoùm oáng chöùa caùp hình 3 laù.(Depth of laying : to centre of duct or trefoil group of ducts)

Gheùp nhieàu maïch caùp :Doøng ñieän ñònh möùc trong caùc baûng 13,14 chæ aùpduïng cho 1 maïch goàm 1 caùp nhieàu loõi hoaëc goàm 2,3caùp moät loõi. Khi soá maïch nhieàu hôn thì doøng ñònhmöùc phaûi ñöôïc hieäu chænh , heä soá hieäu chænh chotrong baûng 19

Effect of grouping of cablesThe current ratings given apply to one multicore cable, or a singleset of single core cables forming a circuit. When two or morecircuits are laid in close proximity the ratings of the cables must bereduced by the group rating factors given on the table 19


Heä soá hieäu chænh doøng ñònh möùc cho caùc maïch cuûa caùp 1 loõi , ñaët theo hình ba laù hay trong oáng ñôn tuyeánGroup rating factores for circuits of single core cables, in trefoil single way ducts, horizontal formation


Soá maïch(Number

of circuits)


(Touching)0,45 0,6

2 0,87 0,91 0,933 0,78 0,84 0,874 0,74 0,81 0,855 0,70 0,79 0,836 0,69 0,78 0,82

Daõy heä soá hieäu chænh doøng ñònh möùc cuûa caùp nhieàu loõi trong oáng ñôn tuyeán treân maët phaúng ngangGroup rating factors for Multicore cables insingle way ducts horizontal formation


Soá oáng cuûa nhoùm(Number

of ducts in group)


(Touching)0,3 0,45 0,6

2 0,90 0,93 0,95 0,963 0,83 0,88 0,91 0,934 0,79 0,85 0,89 0,925 0,75 0,83 0,88 0,916 0,73 0,82 0,87 0,90

I.1.2/ Ñoä suït aùp:Moät yeáu toá quan troïng khaùc phaûi xem xeùt khi choïncôõ caùp laø ñoä suït aùp do toån hao treân caùp.Ñoä suït aùp phuï thuoäc vaøo:- Doøng ñieän taûi- Heä soá coâng suaát- Chieàu daøi caùp- Ñieän trôû caùp- Ñieän khaùng caùpIEE 522-8 quy ñònh ñoä suït aùp khoâng ñöôïc vöôït quaù2.,5% ñieän aùp danh ñònhVôùi maïch 1 pha 220V ñoä suït aùp cho pheùp 5.5VVôùi maïch 3 pha 380V ñoä suït aùp cho pheùp 9.5V.Khi suït aùp lôùn hôn möùc cho pheùp thì khaùch haøngphaûi choïn caùp coù tieát dieän ruoät daãn lôùn hôn.

I.1.2/ Voltage dropAnother important factor for the determination of the conductor size isthe voltage drop. The voltage drop of the cable at a given current iscaused by losses in the cable. In case of a too high voltage drop, it isnecessary to choose a bigger conductor size. The voltage drop in acable denotes the difference in voltage at the beginnining and at theend of the cable. It depends on :

- The current carried- The power factor- The length of the cable- The resistance of cable- Reactance of the cable

The permissible voltage drop is usually stated as a percentage of thecircuit voltage. According to IEE regulation 522-8, it is stipulated thatthe total voltage drop for any particular cable run must be such thatthe voltage drop in the circuit of which the cable forms a part does notexceed 2,5% of the nominal voltage.For single phase circuit 220V, maximum voltage drop is 5,5VFor three phase circuit 380V, maximum voltage drop is 9,5V

spacing

spacing


Choïn caùp döïa vaøo ñoä suït aùp vaø doøng ñieän ñònhmöùcThöôøng thì heä soá coâng suaát cuûa taûi khoâng ñöôïcbieát neân thoâng thöôøng giaû ñònh tröôøng hôïp xaáunhaát luùc hscs =1 vaø ruoät daãn laøm vieäc ôû nhieät ñoätoái ña cho pheùp. Khi ñoù:

V=Vd x I x LVôùi V : ñoä suït aùp

Vd : ñoä suït aùp gaàn ñuùng mV/A/mI : doøng ñieän pha (A)L : chieàu daøi caùp (m)

Selection of cable based on voltage drop and current.Since the actual power factor of the load is usually not known, the mostpractical approach to the question of the voltage drop is to assume theworst conditions, i.e power factor equal to one and the conductor is atmaximum operating temperature. The voltage drop values given in thetables are based on these assumptions.

V=Vd x I x LWhere V : Voltage drop

Vd : Approximate Voltage drop mV/A/mI : Current in Ampere per phase that the cable are to carryL : Route length in metres

Duøng baûng :Ví duï 1: Xem xeùt moät ñoaïn caùp treân khoâng loaïiAVV/SWA 4 loõi , daøi 200m, mang taûi 100A, 3pha, 415 V, 50HzTa coù Vd I L 10400

Neân Vd 100200

10400

xVd 0,52

Choïn trong baûng 1coät 9 seõ ñöôïc loaïi caùp 150m2,taûi doøng ñieän 100A, coù ñoä suït aùp V= 0,45

Using tablesExemple: Consider a route of 200 metres of cable to be installed in air,and to carry 100 ampers load, the supply voltage being 415 V, threephase 50Hz, and the cable to be AVV/ SWA.

Vd I L 10400

Vd 100200

10400

xVd 0,52

Select a cable from Table 1such that the Vd from column 9 is equal toor less than the current. It will be seen that this value is 052 giving acable size of 150 mm2.

Duøng ñoà thò :a) Ñieän aùp cung caáp laø 240/415 VVí duï 1 : Vôùi ví duï treân vaø duøng ñoà thò hình 2, vôùigiaù trò doøng ñieän taûi 100A vaø chieàu daøi caùp 200mseõ choïn ñöôïc caùp coù tieát dieän 150 mm2

Using selection guidesa) 240/415 V supplyExample 1: Using the "Size selection guide" Figure 2 and taking thesame example as previously, the values of current (100 amps) and routelength (200 metres) indicate that a 150 mm2 conductor is required.Although the example mentions cables in air, this size would berequired under any conditions of installation (since the current/routelength location point is not within the shaded area of the chart).

Ví duï 2 : Xeùt 1 ñoaïn caùp CVV/SWA 4 loõi , daøi110m., taûi doøng ñieän 300A , 3 pha 415V, 50Hz

- Khi caùp choân tröïc tieáp trong ñaát : Ñoà thò ôûhình 4 chæ ra côõ caùp phaûi laø 150mm2

- Khi caùp ñi trong oáng : do giao ñieåm giöõa doøngñieän vaø chieàu daøi caùp naèm trong vuøng maøuxaùm neân khi xem baûng 14, seõ thaáy côõ caùp150mm2 chæ taûi ñöôïc doøng ñieän 292A. Vì theákhaùch haøng phaûi choïn côõ caùp 185mm2 ñeå taûidoøng ñieän 300A

b) Khi ñieän aùp cung caáp khaùc 240/ 415 VCaùc ñoà thò chæ ñöôïc thieát laäp ñoái vôùi ñieän aùp240/415V, vì vaäy khi ñieän aùp cung caáp khaùc giaùtrò naøy thì phaûi nhaân chieàu daøi caùp vôùi heä soá chotrong baûng döôùi ñaây vaø sau ñoù môùi duøng caùc ñoàthò thieát laäp cho ñieän aùp 240/415 V.

Example 2: Consider a route of 110 metres of cable carrying 300amps, the supply voltage being 415volts, three phase 50Hz, the cable tobe four core copper PVC/SWA/PVC.- Direct in ground: from figure 4 the values of current (300 amps)

and route length (110 m) indicate that 150 mm2 conductor size willbe required.

- In single way duct: but the current/route length location point fallswithin the shaded area of the chart, it is therefore necessary to checkfor the current carrying capability of 150 mm2 when in ducts fromTable 14 , which shows that this size will only carry 292 amps.Therefore it is necessary to specify a 185 mm2 conductor size to becapable of carrying the 300 amp current.

b) Supply voltages other than 240/415Vthe cable selection guides are based on a voltage of 240/415V, but caneasily be adapted for other voltages by the application of amultiplication factor to the actual route length, and then using thisnotional route length for the selection of the conductor size from theguides

Baûng 21 (Table 21)Ñieän aùp (Voltage) 220/380 V 230/400 V 255/440 VHeä soá nhaân(Multiplying factor)

1,09 1,04 0,96


Ví duï : Xem xeùt moät ñoaïn caùp ruoät nhoâm , giaùpsôïi theùp baûo veä (AVV/SWA) , 4 loõi, daøi 100m , taûidoøng ñieän 150A, 3 pha, 380V, 50Hz, caùp choântrong ñaát.Vì giaù trò ñieän aùp cung caáp laø 380V neân ta nhaânchieàu daøi thöïc cuûa caùp (100m) vôùi heä soá cho trongbaûng 21 (1,09) ta coù :Chieàu daøi giaû ñònh = 100 x 1,09 = 109 mTheo hình 2 , vôùi doøng taûi 150A, chieàu daøi giaûñònh 109m seõ cho caùp coù tieát dieän 120 mm2 .

Example : Consider a route length of 100 metres of cable carrying 150amps, the supply voltage being 380 volts, three phase 50Hz, and thecable to be four core SAC PVC/SWA/PVC installed direct in theground.Since the supply voltage is 380V, multiply the actual route lenth (100m)by the factor given in the table 21 (1,09)Notional route length = 100 x 1,09 = 109 mFrom figure 2 the values of the current (150 amps) and the notionalroute length (109m) indicate that 120 mm2 conductor size will berequired.

I.1.3/ Doøng ñieän ngaén maïchMoät thoâng soá quan troïng nöõa aûnh höôûng ñeán vieäcchoïn tieát dieän ruoät daãn laø doøng ñieän ngaén maïch toáiña cho pheùp . Doøng ñieän ngaén maïch toái ña cho pheùpcuûa caùp caùch ñieän PVC ñieän aùp ñeán 1 kV ñöôïc tínhtheo coâng thöùc ôû baûng 22 vaø ñöôïc dieãn giaûi treân caùchình 5,6.

I.1.3/ Short circuit currentAnother important factor for the determination of the conductor size isthe maximum allowable current during a short circuit.The maximum permissible short circuit current of PVC cables up to1kV can be calculated with the following formulas. In table 22 andillustrated in fig 5,6.


Côõ caùp(Cable type)

Ruoät daãn(Conductor)

Ñoä taêng nhieät ñoäTemperature rising

(0C)

Doøng ñieän ngaén maïch toái ñaMax.short circuit current

(A)PVC Nhoû hôn hoaëc baèng 300 mm2

Up to 300 mm2Ñoàng (Copper) 70-160 115 S t -1/2

Nhoâm (Aluminium) 70-160 76 S t -1/2

Lôùn hôn 300 mm2

Over 300 mm2Ñoàng (Copper) 70-140 103 S t -1/2


S : Tieát dieän ruoät daãn (Conductor area, mm2 )t : Thôøi gian ngaén maïch (Short circuit duration , seconds)


I.2 CAÙP ÑIEÄN LÖÏC CAÙCH ÑIEÄN XLPEI.2.1/ Doøng ñieän ñònh möùc vaø ñoä suït aùp:I.2.1.1/ Caùp treân khoâng

I.2/ XLPE INSULATED POWER CABLEI.2.1/ Current rating and voltage dropII.2.1.1/ Cables installed in air

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng, caùch ñieän XLPE, voû PVC, khoâng giaùp baûo veä, laép treân khoângCurrent ratings and Voltage drop for Copper conductors, XLPE insulated, unarmoured, PVC oversheathed cables,Installed in air

Baûng 23 ( Table 23)Tieátdieänruoätdaãn

Nom.areaofcond.

Caùp 1 loõi ( Single core cable ) Caùp nhieàu loõi ( Multicore cable )2 caùp 1 loõi tieáp

xuùc2-single core

Touching

3 caùp 1 loõi tieápxuùc

3-single coreTouching

3 caùp 1loõi ñaëttheo hình 3 laù3-single core

Trefoil

3 caùp 1loõi ñaëtcaùch khoaûng theomaët phaúng ngang

3-single coreSpaced

Horizontal

3 caùp 1loõi ñaëtcaùch khoaûng theomaët phaûng ñöùng

3-single coreSpaced Vertical

Caùp 2 loõi2 Loadedconductor

Caùp 3 loõi3 Loadedconductor

A B C D E F G

Doøngñieän

ñònh möùcCurrentratings

Ñoä suït aùpApproximate

volt dropper amp

per metre

Doøngñieän



volt dropper amp

per metre

Doøngñieän



volt dropper amp

per metre

Doøngñieän



volt dropper amp

per metre

Doøngñieän

ñònh möùcCurrent ratings

Doøngñieän



volt dropper amp

per metre

Doøngñieän



volt dropper amp

per metremm2 A mV A mV A mV A mV A A mV A mV1,5 28 30,86 25 26,73 24 26,73 29 26,73 28 26 29 23 27.72,5 37 18,90 34 16,37 33 16,37 39 16,37 38 36 18.0 32 17.34 52 11,76 44 10,19 43 10,19 54 10,19 53 49 11.6 42 116 66 7,86 55 6,81 52 6,81 68 6,81 67 63 7.7 54 6.910 91 4,67 79 4,04 75 4,04 93 4,05 92 86 4.6 75 4.116 118 2,95 110 2,55 107 2,55 120 2,56 119 115 2,9 100 2,625 161 1,87 141 1,62 135 1,62 182 1,63 161 149 1,9 127 1,635 200 1,35 176 1,17 169 1,17 226 1,19 201 185 1,3 157 1,250 242 1,01 215 0,88 207 0,87 275 0,90 246 225 1,0 192 0,8770 310 0,71 279 0,62 268 0,61 353 0,65 318 289 0,70 246 0,6195 377 0,52 341 0,45 328 0,45 430 0,50 389 352 0,52 298 0,45120 437 0,43 399 0,38 382 0,37 500 0,42 454 410 0,42 346 0,36150 504 0,36 462 0,33 443 0,32 577 0,37 527 473 0,35 399 0,30185 575 0,30 531 0,28 509 0,26 661 0,33 605 542 0,29 456 0,25240 679 0,25 631 0,24 604 0,22 781 0,29 719 641 0,24 538 0,21300 783 0,22 731 0,21 699 0,20 902 0,28 833 741 0,21 620 0,19400 940 0,20 880 0,20 839 0,17 1085 0,26 1008 - - - -500 1083 0,19 1006 0,18 958 0,16 1253 0,25 1169 - - - -630 1254 0,18 1117 0,17 1077 0,15 1454 0,25 1362 - - - -800 1460 0,17 1262 0,17 1152 0,15 1696 0,24 1595 - - - -1000 1683 0,16 1432 0,16 1240 0,14 1958 0,24 1847 - - - -Nhieät ñoä khoâng khí 300c (Ambient temperature 300C)Nhieät ñoä ruoät daãn toái ña 900c ( Maximum Conductor temperature 900C)

Ghi chuù :Heä soá hieäu chænh khi gheùp nhoùm cho caùch laép töø A ñeán E xem baûng 24Heä soá hieäu chænh khi gheùp nhoùm cho caùch laép G , F xem baûng 25d1 : khoaûng xa töôøng khoâng nhoû hôn ñöôøng kính caùpd2 : toái thieåu 0,3 laàn ñöôøng kính caùp

Note:Group installation correction factor for methods A to E. please reter to Table 24Group installation correction factor for methods F, G. please reter to Table 25Correction factors for ambient air temperature other than 300C, please refer to Table 26d1 : Clearance to wall not less than one cable diameterd2 : Minimum 0,3 times the diameter of cable.


Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm nhieàu maïch caùp 1 loõiÑeå duøng cuøng baûng 23 cho caùp 1 loõi treân khoâng khi laép theo caùch töø A ñeán ECorrection factors for Groups of more than one circuit of Single core CablesTo be used in conjunction with current ratings in Table 23 for Single core cables in free air for installation methods A to E

Baûng 24 ( Table 24)

Caùch laép ñaët (Xem ghi chuù 1)Installation method (See note 1)

Soá maïch 3 pha ( Ghi chuù 4)Number of three-phase circuits (Note 4)

Söû duïng heä soá nhaânñeå hieäu chænh doøng

ñònh möùc choUse as a multiplier

to rating forSoá khayNumbersof trays

1 2 3

Khay khoâng ñuïc loã(ghi chuù 2)

Unperforated trays(Note 2)

H

1 0,95 0,90 0,85

3 caùp ñaët ttheo maëtngang

Three cables inHorizontalformation

2 0,92 0,85 0,80

3 0,90 0,80 0,75

Khay coù ñuïc loã(ghi chuù 2)

Perforated trays(Note 2)

J

1 0,95 0,90 0,85

2 0,95 0,85 0,80

3 0,90 0,85 0,80

Khay coù ñuïc loã naèmñöùng

( ghi chuù 3)Vertical perforated

trays (Note 3)

K

1 0,95 0,85 - 3 caùp ñaët theo maëtñöùng

Three cables inVertical formation2 0,90 0,85 -

Thang treo (ghi chuù 2)Ladder supports

cleats, etc (Note 2)L

1 1,00 0,95 0,95 3 caùp ñaët theo maëtngang

Three cables inHorizontalformation

2 0,95 0,90 0,90

3 0,95 0,90 0,85



H

1 1,00 0,95 0,95

3 caùp ñaët theo hình3 laù

Three cables inTrefoil formation

2 0,95 0,90 0,85

3 0,95 0,90 0,85



J

1 1,00 1,00 0,95

2 0,95 0,95 0,90

3 0,95 0,90 0,85

Khay coù ñuïc loã naèmñöùng

( ghi chuù 3)Vertical perforated

trays (Note 3)

K

1 1,00 0,90 0,90

2 1,00 0,90 0,85

Thang treo( ghi chuù 2)

Ladder supportscleats, etc(Note 2)

L

1 1,00 1,00 1,00

2 0,95 0,95 0,95

3 0,95 0,95 0,90

Ghi chuù :1)Heä soá hieäu chænh duøng cho moät lôùp caùp moät loõi (hoaëc 1 nhoùm caùp hình 3 laù ). Khi caùp laép ñaët nhieàu hôn moät lôùp doøng ñieän ñònh

möùc giaûm ñaùng keå vaø phaûi tính laïi.2)Heä soá hieäu chænh duøng khi khoaûng caùch giöõa caùc khay naèm ngang laø 300mm. Heä soá naøy seõ giaûm khi khoaûng caùch giaûm.3)Heä soá hieäu chænh duøng vôùi khoaûng caùch giöõa caùc khay khi ñaët ñöùng, ñoái löng nhau laø 225mm. Heä soá naøy seõ giaûm khi khoaûng

caùch naøy giaûm4)Khi moãi pha goàm nhieàu sôïi caùp maéc song song, thì 3 sôïi caùp cuûa 3 pha phaûi ñöôïc xem nhö moät maïch khi aùp duïng heä soá hieäu

chænh trong baûng naøy.Note:1)Factors are given for single layers of cables ( or trefoil groups) as shown in the tables and do NOT apply when cables are installed

in more than one layer touching each other Values for such installations may be significantly lower and must be determined by anappropriate method

2)Values are given for a vertical spacing between trays of 300 mm. For closer spacing the factors should be reduced.3)Values are given for a horizontal, spacing between trays of 225 mm with trays mounted back to back. For closer spacing the

factors should be reduced4)For circuits having more than one cable in parallel per phase, each set of three conductors should be considered as a circuit for

the purposes of this table.


Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm nhieàu maïch caùp nhieàu loõiÑeå duøng cuøng baûng 23 cho caùp nhieàu loõi treân khoâng khi laép theo caùch F vaø GCorrection factors for Groups of more than one circuit of Multicore CablesTo be used in conjunction with current ratings in Table 23 for Multicore cables in free air for installation methods F& G


Caùch laép ñaët (Xem ghi chuù 1)Installation method (See note 1)

Soá khayNumbers of

trays

Soá caùpNumber of cable

1 2 3 4 6 9



M

1 0,95 0,85 0,80 0,75 0,70 0,70

2 0,95 0,85 0,75 0,75 0,70 0,65

3 0,95 0,85 0,75 0,70 0,65 0,60

1 1,00 0,95 0,95 0,95 0,90 -

2 0,95 0,95 0,90 0,90 0,85 -

3 0,95 0,95 0,90 0,90 0,85 -



N

1 1,00 0,90 0,80 0,80 0,75 0,75

2 1,00 0,85 0,80 0,75 0,75 0,70

3 1,00 0,85 0,80 0,75 0,70 0,65

1 1,00 1,0 1,00 0,95 0,90 -

2 1,00 1,0 0,95 0,90 0,85 -

3 1,00 1,0 0,95 0,90 0,85 -

Khay coù ñuïc loãthaúng ñöùng( ghi chuù 3)

Vertical perforatedtrays

(Note 3)

O

1 1,00 0,90 0,80 0,75 0,75 0,70

2 1,00 0,90 0,80 0,75 0,70 0,70

1 1,00 0,90 0,90 0,90 0,85 -

2 1,00 0,90 0,90 0,85 0,85 -

Thang treo( ghi chuù 2)

Ladder supportscleats, etc(Note 2)

P

1 1,00 0,85 0,80 0,80 0,80 0,80

2 1,00 0,85 0,80 0,80 0,75 0,75

3 1,00 0,85 0,80 0,75 0,75 0,70

1 1,00 1,00 1,00 1,00 1,00 -

2 1,00 1,00 1,00 0,95 0,95 -

3 1,00 1,00 0,95 0,95 0,95 -

Ghi chuù :1) Heä soá hieäu chænh duøng cho moät lôùp caùp. Khi caùp laép ñaët nhieàu hôn moät lôùp doøng ñieän ñònh möùc giaûm ñi ñaùng keå vaø phaûi

caùch khaùc ñeå tính.2) Heä soá hieäu chænh tính vôùi khoaûng caùch ñöùng giöõa caùc khay naèm ngang laø 300mm. Heä soá naøy seõ giaûm khi khoaûng caùch naøy

giaûm.3) Heä soá hieäu chænh tính vôùi khoaûng caùch giöõa caùc khay khi ñaët ñöùng, ñoái löng nhau laø 225mm. Heä soá naøy seõ giaûm khi

khoaûng caùch naøy giaûm

Note:1) Factors apply to single layer groups of cables as shown above and do NOT apply when cables are installed in more than one

layer touching each other Values for such installations may be significantly lower and must be determined by an appropriatemethod

2) Values are given for a vertical spacing between trays of 300 mm. For closer spacing the factors should be reduced.3) Values are given for a horizontal, spacing between trays of 225 mm with trays mounted back to back. For closer spacing the

factors should be reduced


Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä khoâng khí thay ñoåiCorrection factors for ambient air temperature other than 300C

Baûng 26 (Table 26)Nhieät ñoä khoâng khí

Ambient temperature 0C10 15 20 25 35 40 45 50 55 60 65 70 75 80

Heä soá hieäu chænhCorrection factor

1,15 1,12 1,08 1,04 0,96 0,91 0,87 0,82 0,76 0,71 0,65 0,58 0,50 0,41

I.2.1.2/ Caùp choân trong ñaát: II.1.1.2/ Cables laid direct in ground:

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng, caùch ñieän XLPE, voû PVC coù giaùp baûo veä, choân trong ñaátCurrent ratings and Voltage drop for Copper conductors, XLPE insulated, armoured, PVC oversheathed cables,Laid direct in ground

Baûng 27 (Table 27)Tieát dieän ruoät

daãnNom. area of

cond.

Caùp 1 loõi , giaùp sôïi nhoâm(Single core cable, Aluminium wire armoured )

Caùp nhieàu loõi, giaùp sôïi theùp( Multicore cable, Steel wire armoured )

2 caùp ñaët tieáp xuùc trong löôùiñieän xoay chieàu 1 phaTwo cables touching,

single-phase (ac)

3 caùp tieáp xuùc nhau theo hình3 laù , 3 pha

Three cables trefoil touching,3-phase

Caùp 2 loõi , löôùi ñieän xoaychieàu 1 pha

Two core cable ,single-phase (ac)

Caùp 3 hay 4 loõiThree or four core Cable



amp per metre



amp permetre



volt dropper amp per

metre

Doøngñieän ñònh

möùcCurrentratings


amp per metre

mm2 A mV A mV A mV A mV16 142 2,9 135 2,57 140 2,90 115 2,6025 185 1,88 172 1,55 180 1,90 150 1,6035 226 1,27 208 1,17 215 1,30 180 1,2050 275 0,99 235 0,86 255 1,00 215 0,8770 340 0,70 290 0,61 315 0,70 265 0,6195 405 0,53 345 0,46 380 0,52 315 0,45120 460 0,43 390 0,37 430 0,42 360 0,36150 510 0,37 435 0,32 480 0,35 405 0,30185 580 0,31 490 0,27 540 0,29 460 0,25240 670 0,26 560 0,23 630 0,24 530 0,21300 750 0,24 630 0,21 700 0,21 590 0,19400 830 0,21 700 0,19 - - - -500 910 0,20 770 0,18 - - - -630 1000 0,19 840 0,17 - - - -800 1117 0,18 931 0,16 - - - -1000 1254 0,17 1038 0,15 - - - -Thoâng soá laép ñaët cô sôû :Nhieät trôû suaát cuûa ñaát : 1,2 0Cm/WNhieät ñoä ñaát : 150CÑoä saâu choân caùp : 0,5mNhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 900C

Basic assumptions and conditions of installationSoil thermal resistivity 1.2 0C m/WGround temperature 15 0CDep th of lay ing 0. 5 metreMaximum operating conductor temperature at rated current: 900C.

Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä ñaát thay ñoåi cho trong baûng 28Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm cho trong baûng 29Correction factors for ground temperatures other than 150C, refer to Table 28For group correction factors, please refer to Table 29

Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä ñaát thay ñoåiCorrecion factors for ground temperatures other than 150C

Baûng 28 (Table 28)Nhieät ñoä ñaátGround temperature (0C)

10 15 20 25 30 35 40 45 50

Heä soá hieäu chænhCorrection factors

1,03 1,00 0,97 0,93 0,89 0,86 0,82 0,76 0,72


Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùmGroup correcion factors- to be used in conjunction with ratings for cables in table 29

Baûng 29 (Table 29)Khoaûng hôû giöõa 2 caùp

Cable to cable clearance (a)Soá maïch(Number

of circuits)

Khoâng hôû(caùp tieáp xuùc)

Nil(cables touching)

Khoaûng hôûbaèng ñöôøng

kính moät caùpa= One cable

diameter

0,215 m 0,25 m 0,5 m

2 0,75 0,80 0,85 0,90 0,903 0,65 0,70 0,75 0,80 0,854 0,60 0,60 0,70 0,75 0,805 0,55 0,55 0,65 0,70 0,806 0,50 0,55 0,60 0,70 0,80

i.2.1.3/ Caùp ñi trong oáng ñôn tuyeán choân trong ñaát II.1.1.3/ Cable run in single way ducts

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng, caùch ñieän XLPE, voû PVC coù giaùp baûo veä, ñi trong oáng choân trong ñaátCurrent ratings and Voltage drop for Copper conductors, XLPE insulated, armoured, PVC oversheathed cables,Run in single way ducts


Tieát dieän ruoätdaãn

Nom. area ofcond.

Caùp 1 loõi , giaùp sôïi nhoâm(Single core cable, Aluminium wire armoured )

Caùp nhieàu loõi, giaùp sôïi theùp( Multicore cable, Steel wire armoured )

2 caùp : oáng ñaët tieáp xuùcTwo cables: ducts touching

3 caùp : oáng ñaët tieáp xuùc theohình 3 laù

Three cables : ducts touching,trefoil

Caùp 2 loõiTwo core cable

Caùp 3 hay 4 loõiThree or four core Cable



amp per metre



amp permetre




metre

Doøngñieän ñònh

möùcCurrentratings


amp per metre

mm2 A mV A mV A mV A mV16 140 3,0 130 2.70 115 2,90 94 2,6025 180 2,0 170 1,80 145 1,90 125 1,6035 215 1,4 205 1,25 175 1,30 150 1,2050 255 1,10 235 0,93 210 1,00 175 0,8770 310 0,80 280 0,70 260 0,70 215 0,6195 365 0,65 330 0,56 310 0,52 260 0,45120 410 0,55 370 0,48 355 0,42 300 0,36150 445 0,50 405 0,43 400 0,35 335 0,30185 485 0,45 440 0,39 455 0,29 380 0,25240 550 0,40 500 0,35 520 0,24 440 0,21300 610 0,37 550 0,32 590 0,21 495 0,19400 640 0,35 580 0,30 - - - -500 690 0,33 620 0,28 - - - -630 750 0,30 670 0,26 - - - -800 828 0,28 735 0,24 - - - -1000 919 0,26 811 0,22 - - - -Thoâng soá laép ñaët cô sôû :Nhieät trôû suaát cuûa ñaát : 1,2 0Cm/WNhieät ñoä ñaát : 150CNhieät ñoä khoâng khí : 250CÑoä saâu choân caùp : 0,5mNhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 900C

Basic assumptions and conditions of installationSoil thermal resistivity 1.2 0C m/WGround temperature 15 0CAmbient air temperature 25 0CDep th of lay ing 0. 5 metreMaximum operating conductor temperature at rated current: 900C.

Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä ñaát thay ñoåi cho trong baûng 28Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm cho trong baûng 31

Correcion factors for ground temperatures other than 150C, refer to Table 28For group correcion factors, please refer to Table 31


Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm, söû duïng ñeå hieäu chænh doøng ñònh möùc cho trong baûng 30Group correcion factors- to be used in conjunction with ratings for cables in table 30

Baûng 31 (Table 31)Caùp moät loõi

Soá maïch(Number ofsingle-core

circuits of two orthree cables)

Khoaûng hôû giöõa 2 oáng - Duct to duct clearance (a)Khoâng hôû (oáng tieáp xuùc)

Nil (ducts touching) 0,25 m 0,5 m 1,0 m

2 0,80 0,90 0,90 0,953 0,70 0,80 0,85 0,904 0,65 0,75 0,80 0,905 0,60 0,70 0,80 0,906 0,60 0,70 0,80 0,90

Caùp nhieàu loõi

Soá caùp(Numberof cables)

Khoaûng hôû giöõa 2 oángDuct to duct clearance (a)

Khoâng hôû (oáng tieáp xuùc)Nil (ducts touching)

0,25 m 0,5 m 1,0 m

2 0,85 0,90 0,95 0,953 0,75 0,85 0,90 0,954 0,70 0,80 0,85 0,905 0,65 0,80 0,85 0,906 0,60 0,80 0,80 0,90

II.1.1.4/ Caùp ñi trong oáng trong maùng vaø boù caùpraûi treân beà maët

II.1.1.4/ Cable in conduit and trunking andbunched cables on a surface

Doøng ñieän ñònh möùc cuûa caùp ruoät ñoàng, caùch ñieän XLPE, voû PVC giaùp baûo veä, ñi trong oáng trong maùngCurrent ratings for Copper conductors, XLPE insulated, armoured, PVC oversheathed cables, Cable in conduit and trunking andbunched cables on a surface)


Tieát dieän ruoät daãnNom. area of cond.

Caùp 1 loõi ñi trong oáng choân trongtöôøng

Insulated conductors in conduit ininsulating wall

Caùp 1 loõi ñi trong oáng ñaët treân töôøngInsulated conductors in conduit on wall

Caùp nhieàu loõi ñaët treân töôøng

Multicore cable on a wall

R S T2 sôïi caùp2 Loadedconductor

3 sôïi caùp3 Loadedconductor





mm2 A A A A A A1,5 19 17 23 20 24 222,5 26 23 31 27 33 304 35 31 42 37 45 406 45 40 54 48 58 5210 61 54 74 66 80 7116 81 73 100 89 107 9625 106 95 133 117 138 11935 131 117 164 144 171 14750 158 141 198 175 210 17970 200 179 254 222 269 22995 241 216 306 269 328 278120 278 249 354 312 382 322150 318 285 - - 441 371185 362 324 - - 506 424240 424 380 - - 599 500300 486 435 - - 693 576400 579 519 - - 860 692500 664 595 - - 994 797630 765 685 - - 1155 923800 885 792 - - 1349 10741000 1014 908 - - 1560 1237Nhieät ñoä khoâng khí : 300CNhieät ñoä toái ña cuûa ruoät daãn laø 900C

Ambient air temperature 30 0CMaximum conductor temperature : 900C

Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä kh6ng khí thay ñoåi cho trong baûng 28Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm cho trong baûng 33

Correcion factors for ambient temperatures other than 300C, refer to Table 28For group correcion factors, please refer to Table 33


Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm- Söû duïng ñeå hieäu chænh doøng ñieän ñònh möùc cho trong baûng 32Group correcion factors- to be used in conjunction with ratings for cables in table 32

Baûng 33 (Table 33)Item Caùch ñaët caùp

Arrangement of cablesCorrection factors

Number of circuits or multicore cables1 2 3 4 5 6 7 8 9 10 12 14 16 18 20

1

Boù caùp raûi treân maët hay ñitrong oáng, trong maùngBunched on a surface orenclosed in conduit ortrunking

1,00 0,80 0,70 0,65 0,60 0,55 0,55 0,50 0,50 0,45 0,45 0,40 0,40 0,40 0,40

2 1 lôùp caùp treântöôøng hay neànnhaøSingle-layerwall or floor

Tieáp xuùcTouching

1,00 0,85 0,80 0,75 0,75 0,70 0,70 0,70 0,70 0,70 0,70 0,70 0,65 0,65 0,65

3Caùch

khoaûngSpaced

1,00 0,95 0,90 0,90 0,90 0,90 0,90 0,90 0,90 0,90 0,90 0,90 0,90 0,90 0,90

4 1 lôùp caùp döôùitraàn nhaøSingle-layerunder ceiling

Tieáp xuùcTouching

0,95 0,80 0,70 0,70 0,65 0,65 0,60 0,60 0,60 0,60 0,60 0,60 0,55 0,55 0,55

5Caùch

khoaûngSpaced

0,95 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85 0,85

Löu yù :1) Heä soá ñieàu chænh aùp duïng cho cho caùp mang taûi ñeàu nhau2) Khi khoaûng caùch ngang cuûa hai sôïi caùp keà nhau vöôït quaù hai laàn ñöôøng kính caùp thì khoâng caàn giaûm baèng heä soá hieäu chænh3) Cuøng 1 heä soá ñieàu chænh cho:

- nhoùm 2 hay 3 caùp 1 loõi.- Caùp nhieàu loõi.

4) Neáu gheùp nhoùm n sôïi caùp 1 loõi thì xem nhö laø gheùp nhoùm n/2 maïch 2 sôïi caùp hoaëc n/3 maïch 3 sôïi caùp.Note:1) These factors are applicable to uniform groups of cables. equally loaded2) Where horizontal clearance between adjacent cables exceeds twice their overall diameter, no reduction factor need be applied3) The same correction factors are applied to:

- groups of two or three single-core cables- multicore cables.

4) If a group consists of n loaded single-core cables it may either be considered as n/2 circuits of two loaded conductors or n/3circuits of three loaded conductors.

Baûng 34 ( Table 34)Ruoät daãn

ConductorÑoä taêng nhieät ñoä

Temperature rising(0C)

Doøng ñieän ngaén maïch toái ñaMax.short circuit current

(A)XLPE Ñoàng (Copper) 90-250 143 S t -1/2


S : Tieát dieän ruoät daãn (Conductor area, mm2 )t : thôøi gian ngaén maïch ( Short circuit duration , seconds)

I.2.2/ Doøng ñieän ngaén maïch cuûa caùp boïc XLPE I.2.2/ Short circuit current OF XLPE INSULATED CABLE


II/ CAÙP ÑIEÄN KEÁII.1/ CAÙCH ÑIEÄN PVC

II/ SERVICE ENTRANCE CABLEII.1/ PVC INSULATED

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieän keá caùch ñieän PVC, voû PVC- kyù hieäu DKCVVCurrent ratings and Voltage drop for Copper conductors, PVC insulated, PVC sheathed service entrance cableGioáng baûng 4phaàn caùp ñieän löïc boïc PVC.

II.2/ CAÙCH ÑIEÄN XLPE II.2/ XLPE INSULATEDDoøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieän keá caùch ñieän XLPE, voû PVC hoaëc HDPE –kyù hieäu DKCXV, DKCXECurrent ratings and Voltage drop for Copper conductors, PVC insulated, PVCor HDPE sheathed service entrance cableGioáng baûng 23,coät F,G.

III/ CAÙP ÑIEÀU KHIEÅNIII.1/ CAÙCH ÑIEÄN PVC

III/ CONTROL CABLESIII.1/ PVC INSULATED

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieàu khieån, caùch ñieän PVC, voû PVC-kyù hieäu DVVCurrent ratings and Voltage drop for Copper conductors, PVC insulated, PVC sheathed, Control Cables

Baûng 35 ( Table 35)Côõ caùp

Conductor sizeDoøng ñieän ñònh möùc

Current ratingsÑoä suït aùp

Approximate volt drop peramp per metre

mm2 A mVCaùp treân khoâng ( nhieät ñoä khoâng khí laø 300C, nhieät ñoä ruoät daãn toái ña laø 700C)

In air ( ambient temperature 300C, maximum conductor temperature 700C)1,5 18 252,5 25 154 33 9,56 42 6,4

10 58 3,816 77 2,4

III.2/ CAÙCH ÑIEÄN XLPE III.2/ XLPE INSULATEDDoøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieàu khieån, caùch ñieän XLPE, voû PVC-kyù hieäu DXVCurrent ratings and Voltage drop for Copper conductors, XLPE insulated, PVC sheathed, Control Cables

Baûng 36 ( Table 36)Côõ caùp

Conductor size Doøng ñieän ñònh möùcCurrent ratings

Ñoä suït aùpApproximate volt drop

per amp per metre

mm2 A mVCaùp treân khoâng ( nhieät ñoä khoâng khí laø 300C, nhieät ñoä ruoät daãn toái ña laø 900C)

In air ( ambient temperature 300C, maximum conductor temperature 900C)1,5 22 272,5 31 174 42 106 54 6,8

10 74 4,116 99 2,6

IV/ CAÙP MULTIPLEX IV/ MULTIPLEX CABLEDoøng ñieän ñònh möùc cuûa caùp Multiplex, boïc PVC hoaëc XLPECurrent ratings for Nonsheathed, PVC or XLPE insulated Multiplex Cable

Baûng 37 (Table 37)Côõ caùp

Conductorsize

Duplex Triplex QuadruplexCV AV CX AX CV AV CX AX CV AV CX AX

mm2 A A A A A A A A A A A A4 37 - 49 - 33 - 45 - 31 - 40 -6 47 - 63 - 43 - 60 - 41 - 56 -10 65 52 86 68 59 47 80 62 56 44 76 5816 87 70 115 92 79 63 110 78 76 61 108 7825 114 91 149 119 104 83 135 105 101 80 130 10535 140 112 185 148 129 103 169 125 125 100 164 12550 189 151 225 180 167 133 207 150 151 120 202 15070 215 172 289 230 214 171 268 185 192 153 262 185


V/ DAÂY ÑIEÄN LÖÏC V/ PVC OR XLPE INSULATED - NONSHEATHED CABLE

Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa daây ñieän löïc, caùch ñieän PVC hoaëc XLPECurrent ratings and Voltage drop for Nonsheathed, PVC or XLPE insulated Cable


Côõ caùpConductor

size

Daây ñieän löïc boïc PVCNonsheathed, PVC insulated Cable

Daây ñieän löïc boïc XLPENonsheathed, XLPE insulated Cable

CV AV CX AXDoøng ñieänñònh möùcCurrentratings



metre



amp permetre




metre




metremm2 A mV A mV A mV A mV

1,0 15 38 - - 20 40 - -1,5 20 25 - - 26 31 - -2,5 27 15 - - 36 19 - -4 37 9,5 - - 49 12 - -6 47 6,4 - - 63 7,9 - -10 65 3,0 52 - 86 4,7 68 -16 87 2,4 70 3,9 115 2,9 92 4,825 114 1,55 91 2,5 149 1,9 119 3,135 140 1,10 112 1,8 185 1,35 148 2,250 189 0,82 151 1,35 225 0,87 180 1,470 215 0,57 172 0,92 289 0,62 230 0,9895 260 0,42 208 0,67 352 0,47 281 0,74120 324 0,35 259 0,54 410 0,39 328 0,60150 384 0,29 307 0,45 473 0,33 378 0,49185 405 0,25 324 0,37 542 0,28 430 0,41240 518 0,21 414 0,30 641 0,24 512 0,34300 570 0,19 456 0,25 741 0,21 592 0,29400 660 0,17 528 - 830 0,195 - -500 792 0,16 633 - 905 0,180 - -630 904 0,15 723 - 1019 0,170 - -800 1030 0,15 824 - 1202 - - -Nhieät ñoä khoâng khí laø 300CNhieät ñoä ruoät daãn laø 700C

Ambient temperature 300CMaximum conductor temperature 700C


VI/ DAÂY ÑIEÄN BOÏC NHÖÏA PVC VI/ PVC INSULATED WIRE

Doøng ñieän ñònh möùc cuûa daây ñieän boïc nhöïa PVCCurrent ratings of PVC insulated wire

Baûng 39 ( Table 39)Daây ñoâi meàm, ruoät ñoàng

Flexible Copper conductor – PVC insulated wireDaây ñôn cöùng, ruoät ñoàng hoaëc nhoâm

Solid Copper or Aluminium conductor – PVC insulated wireSoá loõi

Num. ofcore

Tieát dieänNom. area

of conductor

Daây ñoâi meàmdeït, meàm xoaénVCmd , VCmx

Daây ñoâi meàm troøn, meàmovan, meàm oval deït

VCmt , VCmo , VCmod


of conductor

Ñöôøng kính sôïiDiameter of

wire

VCRuoät ñoàng

Copperconductor

VARuoät nhoâmAluminiumconductor

mm2 A A mm2 mm A A2 0,5 5 7 1 1,13 17 -2 0,75 7 10 1,13 1,20 19 -2 1,0 10 11 1,5 1,4 23 -2 1,25 12 13 2,0 1,6 27 -2 1,5 14 15 2,5 1,8 30 232 2,0 16 17 3 2,0 35 262 2,5 18 20 4 2,25 42 322 3,5 - 24 5 2,60 48 362 4,0 - 27 6 2,78 51 392 5,5 - 32 7 3,0 57 432 6,0 - 36

VII/ DAÂY ÑOÀNG TRAÀN XOAÉN, DAÂYNHOÂM TRAÀN XOAÉN VAØ DAÂYNHOÂM LOÕI THEÙP

VII/ BARE STRANDED COPPER AND ALUMINIUMCONDUCTOR AND ALUMINIUMCONDUCTOR STEEL REINFORCED

Doøng ñieän ñònh möùc cuûa daây ñoàng traàn xoaén, daây nhoâm traàn xoaénCurrent ratings of Bare stranded copper conductor, Bare stranded aluminium conductor Baûng 40 ( Table 40)


of conductor

Daây ñoàng traàn xoaénBare stranded copper conductor

C

Daây nhoâm traàn xoaénBare stranded aluminium conductor

ADoøng ñieän ñònh möùc

Current ratingsDoøng ñieän ñònh möùc ôû vuøng oân ñôùi.

Temperate Current ratings.mm2 A A

4 50 -

6 70 -10 95 -14 120 -16 130 10525 180 13535 220 17038 230 18250 270 21560 305 22570 340 26580 377 27695 415 320

100 450 340120 485 375125 500 390150 570 440185 640 500240 760 590300 880 680325 943 710400 1050 815500 1254 980630 1497 1170800 1662 1330


ACSRBaûng 41 ( Table 41)


of conductor

Daây nhoâm loõi theùpAluminium conductor steel reinforced

Doøng ñieän ñònh möùc ôû vuøng oân ñôùiTem perate Current ratings

Doøng ñieän ñònh möùc ôû vuøng nhieät ñôùiTropical Current ratings

mm2/ mm2 A A

35/ 6 175 89

50/ 8 210 105

70/ 11 265 127

95/ 16 330 145

120/ 19 375 161

150/ 24 445 173

185/ 29 510 185

240/ 39 610 199

300/ 48 690 205

330/ 43 712 -

400/ 51 835 -

450/ 40 856 -

500/ 64 940 -

560/ 38 980 -

560/ 70 990 -

680/ 85 1220 -


B

CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 26

C/ LAÉP ÑAËTI/ Ñoä uoán cong laép ñaêt toái thieåu

C/ ( HANDLING)I/ Minimum bending radius

Baûng 24 (Table 24)Loaïi caùp ( Type of cable) 1 loõi

(Single core)Nhieàu loõi

(Multi cores)Haï theá 0,6/1 kV(Low voltage)

Khoâng giaùp (Non armoured) 8D 6DGiaùp baêng sôïi (Tape, wire armoured) 10D 8D

D : ñöôøng kính cuûa caùp (Overall dia. Of cable)

II/ Löïc keùo caùp toái ña cho pheùp II/ Permissible max. pulling tensileBaûng 25 (Table 25)

Phöông thöùc keùo (Means of pulling)Loaïi caùp

( Type of cable)Coâng thöùc(Formula)

Heä soá(Factor)

Ñaàu keùo keïp vaøo ruoät daãnWith pulling head attached to conductor

Taát caû caùc loaïi caùpAll type of cable

P=. A = 50 N/mm2 ( Cu- conductor) = 30 N/mm2 ( Al- conductor)

Ñaàu keùo keïp vaøo ñaàu caùpWith pulling stocking

Caùp khoâng giaùp hoaëc giaùp baêngCable unarmoured or double

tape armourP=. A

= 50 N/mm2 ( Cu- conductor) = 30 N/mm2 ( Al- conductor)

Caùp giaùp sôïiWire armoured cables

P=K.d2 K=9N/mm2

P : Löïc keùo (Pulling tensile) (N)A : Tieát dieän toång caùc ruoät daãn (Total cross sectionnal area of all conductor) (mm2)d : Ñöôøng kính caùp ( Diameter of cable ) (mm) : ÖÙng suaát keùo cuûa ruoät (Permissible tensile streng of conductor ) (N/mm2)

III/ Aùp suaát taùc duïng leân caùpAùp suaát toái ña cho pheùp taùc duïng leân caùp taïi ñieåm uoántrong khi laép ñaët laø 500kg/m

III./ Side wall pressure to cablePermissible maximum side wall pressure to the cable at bendingpoint during installation is 500 kg/m

IV / Taùch voû caùpThao taùc caån thaän keûo hoûng lôùp caùch ñieän vaø sinhñaùnh thuûng caùp.

IV / Removal of sheath or tapeSpecial care must be taken not to harm the insulation. Whenremoving the sheath with a knife otherwise it may result in adielectric breakdown

V / Laøm saïch beà maët lôùp caùch ñieänPhaûi laøm saïch beà maët lôùp caùch ñieänñeå khoâng bò phoùng ñieän taïi ñaàu noái

V/ Cleaning the surface of insulationThe surface of insulation should be cleaned to avoid a flashover at the cable termination or joint

VI/ Xöû lyù choáng thaám nöôùc cho ñaàu noái ngoaøi trôøiÑaàu noái ngoaøi trôøi phaûi ñöôïc xöû lyù choáng thaám nöôùcvaø quaán baêng caån thaän ñeå nöôùc khoâng luoàn vaøo ñaàucaùp.

VI/ Water proof treatment for out-door terminationFor out-door termination water proof treatment is necessan toavoid the water penetrating to the cable end and special caremust be taken to apply tapes end terminals.

D / HÖÔÙNG DAÃN ÑAËT HAØNG CAÙP HAÏ THEÁKhi ñaët haøng xin quí khaùch vui loøng thoâng baùo cho CADIVInhöõng thoâng tin sau:1. Toång chieàu daøi vaø chieàu daøi 1 tureâ.2. Taàm ñieän aùp.3. Soá loõi.4. Côõ ruoät daãn vaø ruoät trung tính.5. Vaät lieäu ruoät daãn ñoàng, nhoâm.6. Vaät lieäu caùch ñieän.7. Ñoän sôïi hay boïc loùt.8. Giaùp baêng hay sôïi, nhoâm hay theùp.9. Vaät lieäu voû.10. Tieâu chuaån aùp duïng.

D / PURCHASING GUIDELINESThe purchaser should supply the following information at thetime of enquiry and order1. Length of cable required and individual drum length ofimportant2. Voltage designation3. Number of cores4. Conductor size and where applicable, size of reducedconductor5. Conductor material i.e copper , aluminum6. Insulation material, i.e, PVC, XLPE7. PP yarn or extruded bending8. Non armour, double steel tape armour, double aluminumtape armour, Aluminum wire armour9. Sheath material10. Applied standard TCVN, ASTM, IEC, BS, DIN, AS

Engineering

HDSD cap ha the