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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...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
2
HÖÔÙNG DAÃN LÖÏA CHOÏN VAØ SÖÛ DUÏNG CAÙP HAÏ THEÁ
CAÙCH ÑIEÄN PVC HOAËC X...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
3
trong möông caùp hôû, khoaûng caùch töø töôøng ñeán beà
maët caùp phaûi lô...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
4
Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng, caùch ñieän ...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
5
Thoâng soá laép ñaët :
Nhieät ñoä khoâng khí 300
C
Nhieät ñoä ruoät daãn t...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
6
Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
7
Heä soá hieäu chænh doøng ñònh möùc khi giaù trò nhieät trôû suaát cuûa ña...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
8
Heä soá hieäu chænh doøng ñònh möùc cuûa caùp nhieàu loõi ñaët treân maët ...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
9
Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
10
Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä ñaát thay ñoåi.
Rating...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Heä soá hieäu chænh doøng ñònh möùc cho caùc maïch cuûa caùp 1 loõi , ñaë...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Choïn caùp döïa vaøo ñoä suït aùp vaø doøng ñieän ñònh
möùc
Thöôøng thì h...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Ví duï : Xem xeùt moät ñoaïn caùp ruoät nhoâm , giaùp
sôïi theùp baûo veä...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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I.2 CAÙP ÑIEÄN LÖÏC CAÙCH ÑIEÄN XLPE
I.2.1/ Doøng ñieän ñònh möùc vaø ñoä...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm nhieàu maïch ca...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
16
Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm nhieàu maïch ca...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä khoâng khí thay ...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm
Group correcion...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
19
Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm, söû duïng ñeå ...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm- Söû duïng ñeå ...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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II/ CAÙP ÑIEÄN KEÁ
II.1/ CAÙCH ÑIEÄN PVC
II/ SERVICE ENTRANCE CABLE
II.1/...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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V/ DAÂY ÑIEÄN LÖÏC V/ PVC OR XLPE INSULATED - NONSHEATHED CABLE
Doøng ñie...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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VI/ DAÂY ÑIEÄN BOÏC NHÖÏA PVC VI/ PVC INSULATED WIRE
Doøng ñieän ñònh möù...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
24
ACSR
Baûng 41 ( Table 41)
Tieát dieän
Nom. area
of conductor
Daây nhoâm l...
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)
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B
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 26
C/ LAÉP ÑAËT
I/ Ñoä uoán cong laép ñaêt toái thieåu
C/ ( HANDLING)
I/ Min...
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  • Công ty cổ phần thương mại và xây dựng Nguyên Tâm NHÀ PHÂN PHỐI DÂY CÁP ĐIỆN TOÀN QUỐC VPGD: Số 76 An Dương, phường Yên Phụ, quận Tây Hồ, Hà Nội Tel: 02437173982 , 02437170497 , 02437173426 , 0988423986 Email: nguyentam@daycap.com.vn - website: www.daycap.com.vn Https://www.facebook.com/daycapdiennguyentam
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  1. 1. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 1 COÂNG TY COÅ PHAÀN DAÂY CAÙP ÑIEÄN VIEÄT NAM (CADIVI)  HÖÔÙNG DAÃN LÖÏA CHOÏN VAØ SÖÛ DUÏNG CAÙP HAÏ THEÁ CAÙCH ÑIEÄN PVC HOAËC XLPE INSTRUCTION OF CHOOSING AND USING OF LOW VOLTAGE CABLES, PVC OR XLPE INSULATED
  2. 2. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 2 HÖÔÙNG DAÃN LÖÏA CHOÏN VAØ SÖÛ DUÏNG CAÙP HAÏ THEÁ CAÙCH ÑIEÄN PVC HOAËC XLPE INSTRUCTION OF CHOOSING AND USING OF LOW VOLTAGE CABLES, PVC OR XLPE INSULATED ________________________________________________________________________________________ A/ CHOÏN TIEÁT DIEÄN RUOÄT DAÃN: Khi choïn caùp, khaùch haøng caàn xem xeùt nhöõng yeáu toá 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 LÖÏC I.1/ CAÙP CAÙCH ÑIEÄN PVC I.1.1/ Doøng ñieän ñònh möùc: Doøng ñieän chaïy trong ruoät caùp thì seõ sinh nhieät laøm cho caùp noùng leân. Khi nhieät ñoä caùp vöôït quaù möùc cho pheùp thì phaûi choïn caùp coù tieát dieän ruoät daãn lôùn hôn. 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 ñaët I.1.1.1/ Caùp treân khoâng Caùp laép treân khoâng ña soá laø trong caùc toøa nhaø neân doøng ñieän ñònh möùc ñöôïc tính vôùi nhieät ñoä khoâng khí laø 300 C, caùp khoâng bò naéng roïi tröïc tieáp vaø khoâng khí löu thoâng töï do. Khi caùp bò naéng roïi tröïc tieáp, doøng ñieän ñònh möùc seõ giaûm ñi. Doøng ñieän ñònh möùc trong caùc baûng 1,2,3,4 cho caùp laép 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 töø töôøng ñeán beà maët caùp phaûi lôùn hôn hoaëc baèng 20mm, khoaûng caùch taâm 2 sôïi caùp keà nhau baèng 2 laàn ñöôøng kính cuûa caùp. Vôùi 2 caùp 1 loõi, doøng ñieän ñònh möùc ñöôïc aùp duïng an toaøn cho tröôøng hôïp 2 sôïi caùp laép ñaët treân caùc thanh ngang coá ñònh treân töôøng, khoaûng caùch giöõa taâm 2 sôïi caùp nhö treân, hoaëc caùp tieáp xuùc nhau suoát chieàu daøi caùp.  Vôùi 3 caùp 1 loõi laép ñaët theo hình 3 laù, theo maët ñöùng coá ñònh treân töôøng hay trong maùng caùp hôû, khoaûng caùch tính töø töôøng ñeán beà maët caùp phaûi lôùn hôn hoaëc baèng 20mm. b) Caùp nhieàu loõi : Khoâng nhö caùp moät loõi, caùp nhieàu loõi ñöôïc laép ñaët ñôn leû theo moät maët ñöùng coá ñònh treân töôøng hay A/ SELECTION OF CROSS-SECTIONNAL AREA 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 CABLE I.1/ PVC INSULATED POWER CABLE I.1.1/ Current rating When electric current flows through the conductor of a cable the electrical resistance of the conductor generates heat. When a temperature greater than that allowed is reached by the cable due to heat generation, a larger conductor size (with lower electrical resistance ) 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 installation I.1.1.1/ Cables installed in air: It is anticipated that many of the “in air” installation will be in buildings, and the ratings are therefore given on the basis of an ambient air temperature of 300 C It should be noted that all ratings for cables run in free air have been based on the assumption that they are shielded from the direct rays of the sun without restriction of ventilation. The ratings for cables subjected to solar radiation should be reduced to take account of this factor The ratings given in Tables 1,2,3,4 are for cables installed under defined conditions a) 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 as follows, the distance being at least 20 mm in each instance. Cables are installed at a distance between centres of twice the overall diameter of the cable. The ratings for two cables may be applied with safety in instances where such cables are installed in horizontal formation on brackets fixed to a wall, either spaced as indicated above, or touching throughout.  Three single core cables are installed in trefoil formation, fixed to the vertical surface of a wall or open cable trench, the cables touching throughout and the distance between the wall and the surface 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 cables Cables of all types other than single core cables are installed singly, fixed to the vertical surface of a wall or open cable trench, the
  3. 3. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 3 trong möông caùp hôû, khoaûng caùch töø töôøng ñeán beà maët caùp phaûi lôùn hôn hoaëc baèng 20mm. Neáu nhaát thieát phaûi laép ñaët caùp vôùi khoaûng caùch nhoû hôn qui ñònh thì soá lieäu seõ cho rieâng trong caùc baûng coù tieâu ñeà "Clipped direct to a surface. ." theo IEE distance between the surface of the cable and the wall being at least 20 mm in every instance. If it is necessary for cables to be installed at distances less than those described above, then the values tabulated under the heading." "Clipped direct to a surface. . in the IEE Wiring Regulations should be employed. Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät nhoâm , caùch ñieän PVC, voû PVC coù giaùp baûo veä, laép treân khoâng Current ratings and Voltage drop for Alluminium conductors, PVC insulated, armoured, PVC oversheathed cables, Installed in air Baûng 1 ( Table 1) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core ) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp ñaët caùch khoaûng Two cables spaced 3 caùp tieáp xuùc nhau theo hình 3 laù Three cables trefoil touching Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 16 80 4.7 65 4.0 72 4,6 61 4,0 25 109 3.1 85 2.5 92 2,9 80 2,5 35 131 2.2 110 1.8 113 2,1 98 1,8 50 159 1,6 133 1,3 136 1,5 120 1,8 70 200 1,1 166 0,94 173 1,1 151 0,93 95 245 0,82 205 0,69 213 0,79 188 0,68 120 280 0,68 239 0,56 - - 218 0,54 150 325 0,57 272 0,46 - - 248 0,45 185 371 0,49 317 0,38 - - 288 0,37 240 437 0,41 375 0,31 - - 344 0,29 300 498 0,37 431 0,27 - - 396 0,25 380 559 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 khoâng Current ratings and Voltage drop for Alluminium conductors, PVC insulated, unarmoured, PVC oversheathed cables Installed in air Baûng 2 ( Table 2) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp ñaët caùch khoaûng Two cables spaced 3 caùp (Three cables) Tieáp xuùc nhau theo hình 3 laù Trefoil touching Treân cuøng maët phaúng vaø caùch khoaûng Laid flat spaced Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A MV 16 78 4,7 64 4,0 76 4,0 70 4,6 59 4,0 25 105 3,1 83 2,5 101 2,5 90 2,9 78 2,5 35 128 2,2 105 1,8 123 1,8 110 2,1 96 1,8 50 153 1,6 129 1,3 149 1,3 134 1,5 117 1,3 70 194 1,1 164 0,94 189 0,95 169 1,1 149 0,93 95 241 0,81 202 0,68 234 0,70 209 0,79 183 0,68 120 281 0,66 236 0,55 273 0,58 - - 212 0,54 150 324 0,56 271 0,46 313 0,49 - - 243 0,45 185 373 0,47 315 0,37 364 0,42 - - 281 0,37 240 446 0,40 376 0,30 434 0,40 - - 336 0,29 300 515 0,35 436 0,26 503 0,36 - - 387 0,25 380 601 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 - - - -
  4. 4. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 4 Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng, caùch ñieän PVC, voû PVC coù giaùp baûo veä, laép treân khoâng Current ratings and Voltage drop for Copper conductors, PVC insulated, armoured, PVC oversheathed cables Installed in air Baûng 3 ( Table 3) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core ) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp ñaët caùch khoaûng Two cables spaced 3 caùp tieáp xuùc nhau theo hình 3 laù Three cables trefoil touching Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 1,5 26 33 24 26 23 29 20 25 2,5 33 21 29 16 31 17 26 15 4 50 12 39 9,7 41 11 36 9,5 6 62 8,0 44 6,5 53 7,4 45 6,4 10 80 4,8 64 3,8 72 4,4 62 3,8 16 108 3,2 88 2,3 96 2,8 82 2,4 25 140 1,9 121 1,5 128 1,7 109 1,5 35 170 1,4 150 1,1 156 1,3 133 1,1 50 217 0,98 181 0,82 189 0,94 162 0,82 70 271 0,71 228 0,58 237 0,66 205 0,57 95 332 0,54 280 0,44 293 0,49 252 0,42 120 383 0,46 326 0,36 338 0,40 291 0,35 150 431 0,41 371 0,31 384 0,34 334 0,29 185 489 0,37 425 0,27 445 0,29 383 0,25 240 568 0,33 500 0,23 525 0,24 451 0,21 300 640 0,31 571 0,20 598 0,21 514 0,18 400 707 0,29 649 0,19 685 0,19 589 0,17 500 777 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 khoâng Current ratings and Voltage drop for Copper conductors, PVC insulated, unarmoured, PVC oversheathed cables Installed in air Baûng 4 ( Table 4) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp ñaët caùch khoaûng Two cables spaced 3 caùp (Three cables) Tieáp xuùc nhau theo hình laù Trefoil touching Treân cuøng moät maët phaúng vaø caùch khoaûng Laid flat spaced Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV A mV 1,5 24 30 21 26 23 26 22 27 19 24 2,5 31 19 27 14 30 15 29 16 24 13 4 45 10 36 9,5 43 9,5 38 10 32 9 6 58 6 40 7,5 50 6,8 45 7 38 6 10 76 4,1 58 3,8 70 3,8 68 4 55 3,3 16 101 3,0 85 2,4 95 2,5 91 2,8 79 2,4 25 135 1,8 118 1,5 128 1,7 122 1,7 103 1,5 35 169 1,4 145 1,1 160 1,2 149 1,3 128 1,1 50 207 0,97 173 0,82 201 0,83 182 0,94 156 0,82 70 262 0,70 219 0,58 255 0,60 229 0,66 197 0,57 95 325 0,53 273 0,43 317 0,47 284 0,49 243 0,42 120 379 0,45 318 0,35 368 0,40 330 0,40 284 0,35 150 435 0,39 365 0,30 424 0,35 379 0,34 324 0,29 185 504 0,35 423 0,25 492 0,33 436 0,29 374 0,25 240 602 0,31 505 0,22 588 0,32 519 0,24 446 0,21 300 697 0,29 583 0,19 681 0,31 598 0,21 572 0,18 400 815 0,28 679 0,18 796 0,28 695 0,19 593 0,17 500 948 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 - - - -
  5. 5. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 5 Thoâng soá laép ñaët : Nhieät ñoä khoâng khí 300 C Nhieät ñoä ruoät daãn toái ña khi caùp taûi doøng ñieän ñònh möùc 700 C Chæ neân cho caùp lieân tuïc mang ñuû doøng ñieän ñònh möùc khi doøng ñieän toái thieåu cuûa maïch baûo veä khoâng vöôït quaù 1,45 laàn doøng ñieän ñònh möùc. Vieäc laép ñaët nhieàu sôïi caùp seõ khoâng laøm giaûm doøng ñieän 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 installation Ambient air temperature 300 C Maximum conductor operating temperature at rated current 700 C Cables shall only be continuously operated at their full rating if the minimun current at which circuit protection is designed to operate does not exceed 1,45 times the values tabulated. Effect of grouping of cables: no reduction in rating is necessary providing 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 ñoåi Rating factors for other ambient air temperatures Baûng 5 (Table 5) Nhieät ñoä moâi tröôøng Ambient air temperature 25 35 40 45 50 55 Heä soá hieäu chænh Rating 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 ñaát Current ratings and Voltage drop for Alluminium conductors, PVC insulated, armoured, PVC oversheathed cables Laid direct in ground Baûng 6 ( Table 6) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core ) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp ñaët caùch khoaûng Two cables spaced 3 caùp tieáp xuùc nhau theo hình 3 laù Three cables trefoil touching Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 16 98 4,7 76 4,0 91 4,6 77 4,0 25 122 3,1 102 2,5 118 2,9 100 2,5 35 148 2,2 125 1,8 142 2,1 120 1,8 50 180 1,6 154 1,3 168 1,5 143 1,3 70 221 1,1 188 0,92 209 1,1 176 0,93 95 265 0,80 226 0,68 250 0,79 213 0,68 120 302 0,64 257 0,55 - - 243 0,54 150 338 0,54 288 0,46 - - 272 0,45 185 382 0,44 326 0,38 - - 309 0,37 240 442 0,36 377 0,31 - 360 0,29 300 498 0,31 424 0,26 - - 407 0,25 380 558 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 - - - -
  6. 6. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 6 Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän PVC, voû PVC coù giaùp baûo veä, choân trong ñaát Current ratings and Voltage drop for Copper conductors, PVC insulated, armoured, PVC oversheathed cables, Laid direct in ground Baûng 7 ( Table 7) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp ñaët caùch khoaûng Two cables spaced 3 caùp tieáp xuùc nhau theo hình 3 laù Trefoil touching Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 1,5 33 32 29 25 32 29 27 25 2,5 44 20 38 15 41 17 35 15 4 59 11 53 9,5 55 11 47 9,5 6 75 9 66 6,4 69 7,4 59 6,4 10 101 4,8 86 3,8 92 4,4 78 3,8 16 128 3,2 110 2,4 119 2,8 101 2,4 25 168 1,9 142 1,5 158 1,7 132 1,5 35 201 1,4 170 1,1 190 1,3 159 1,1 50 238 0,97 203 0,82 225 0,94 188 0,82 70 292 0,67 248 0,58 277 0,66 233 0,57 95 349 0,50 297 0,44 332 0,49 279 0,42 120 396 0,42 337 0,36 377 0,40 317 0,35 150 443 0,36 376 0,31 422 0,34 355 0,29 185 497 0,31 423 0,27 478 0,29 401 0,25 240 571 0,26 485 0,23 561 0,24 462 0,21 300 640 0,23 542 0,20 616 0,21 517 0,18 400 708 0,22 600 0,19 693 0,19 580 0,17 500 780 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 0 Cm/W Nhieät ñoä ñaát : 150 C Ñoä saâu choân caùp : 0,5m (tính ñeán taâm cuûa caùp hoaëc taâm cuûa nhoùm caùp hình 3 laù) Nhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 700 C Chæ neân cho caùp lieân tuïc mang ñuû doøng ñieän ñònh möùc khi doøng ñieän toái thieåu cuûa maïch baûo veä khoâng vöôït quaù 1,3 laàn doøng ñieän ñònh möùc. Heä soá hieäu chænh Doøng ñieän ñònh möùc cuûa caùp choân tröïc tieáp trong ñaát phuï thuoäc vaøo nhieät ñoä ñaát vaø nhieät trôû suaát cuûa ñaát. Heä soá hieäu chænh trong baûng 8 duøng ñeå hieäu chænh doøng ñieän ñònh möùc theo söï thay ñoåi cuûa nhieät ñoä ñaát. Khi nhöõng ñieàu kieän hoaït ñoäng cuûa caùp ñöôïc xaùc ñònh moät caùch chính xaùc, vaø coù hieåu bieát veà ñaát suoát caû loä trình ñi caùp, khaùch haøng coù theå xaùc ñònh doøng ñieän ñònh möùc moät caùch chính xaùc hôn qua söû duïng heä soá nhieät trôû suaát cuûa ñaát, heä soá gheùp nhoùm, heä soá ñieàu chænh theo ñoä saâu ñaët caùp… trong caùc baûng 8,9,10,11,12. Basic assumptions and conditions of installation Ground thermal resistivity 1.2 0 C m/W Ground temperature 15 0 C Depth of laying 0,5 metre (to the centre of cable or trefoil group of cables) Maximum operating conductor temperature at rated current: 700 C. Cables shall only be continuously operated at their full rating if the minimum current at which circuit protection is designed to operate does not exceed 1,3 times the values tabulated. Rating factors Ratings for cables installed direct in the ground are based on values of soil temperature and soil thermal resistivity Rating factors to take account of variation in ground temperature are given with the current rating tables. Where conditions of operation can be fairly accurately estimated, and knowledge of the soil along the route is available, it is possible to determine the ratings more precisely by the use of the soil thermal resistivity factors, grouping factors and factors for the depths of laying given in Tables 8 to 12. Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä ñaát thay ñoåi Rating factors for other ground temperatures Baûng 8 (Table 8) Nhieät ñoä ñaát Ground temperature (0 C) 20 25 30 35 40 45 Heä soá hieäu chænh Rating factor 0,95 0,90 0,85 0,80 0,74 0,67
  7. 7. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 7 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 9 (Table9) Loaïi vaø côõ caùp Type & Size of cable (mm2 ) Nhieät trôû suaát cuûa ñaát Soil thermal resistivity in 0 Cm/W 0,8 0,9 1,0 1,5 2,0 2,5 Caùp 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) 1,16 1,17 1,17 1,12 1,12 1,12 1,07 1,07 1,07 0,91 0,91 0,91 0,81 0,80 0,80 0,73 0,73 0,73 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) 1,12 1,14 1,16 1,08 1,10 1,10 1,05 1,06 1,07 0,93 0,92 0,92 0,84 0,82 0,81 0,77 0,75 0,74 Heä soá hieäu chænh doøng ñònh möùc khi ñoä saâu choân caùp thay ñoåi Rating factors for depth of laying ( to centre of cable or trefoil group of cables) Baûng 10 (Table 10) Ñoä saâu ñaët caùp Depth of laying (m) 600/1000 V Döôùi 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 1,00 0,60 0,99 0,98 0,97 0,80 0,97 0,96 0,94 1,00 0,95 0,93 0,92 1,25 0,94 0,92 0,89 1,50 0,93 0,90 0,87 1,75 0,92 0,89 0,86 2,00 0,91 0,88 0,85 2,50 0,90 0,87 0,84 3,00 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 laù Depth 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 ngang Group 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 hình ba laù (Trefoil ) Xeáp treân maët phaúng (Laid flat ) 2 0,78 0,81 0,83 0,88 0,91 0,93 3 0,66 0,70 0,73 0,79 0,84 0,87 4 0,61 0,64 0,68 0,73 0,81 0,85 5 0,56 0,60 0,64 0,73 0,79 0,85 6 0,53 0,57 0,61 0,71 0,78 0,82 spacing Spacing*
  8. 8. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 8 Heä soá hieäu chænh doøng ñònh möùc cuûa caùp nhieàu loõi ñaët treân maët phaúng ngang Group rating factors for Multicore cables in horizontal formation Baûng 12 (Table 12) Soá caùp trong moät nhoùm (Number of cables in group ) 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 0,95 3 0,70 0,78 0,84 0,84 0,90 4 0,63 0,74 0,81 0,81 0,89 5 0,59 0,70 0,78 0,78 0,87 6 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 ñôn tuyeán 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 dieän ruoät daãn Nominal area of conductor 1 loõi (Single core ) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp : oáng tieáp xuùc nhau Two cables : ducts touching 3 caùp: oáng xeáp theo hình ba laù tieáp xuùc nhau Three cables: ducts trefoil touching Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A MV A mV A mV 16 87 4,7 78 4,2 75 4,6 62 4,0 25 115 3,1 100 2,6 96 2,9 81 2,5 35 140 2,2 123 1,9 115 2,1 97 1,8 50 166 1,6 154 1,4 137 1,5 116 1,3 70 204 1,2 188 1,0 170 1,1 144 0,93 95 241 0,88 222 0,76 204 0,79 174 0,68 120 274 0,74 252 0,64 - - 199 0,54 150 306 0,64 280 0,55 - - 223 0,45 185 335 0,55 306 0,48 - - 254 0,37 240 381 0,48 347 0,41 - - 298 0,29 300 423 0,43 384 0,37 - - 338 0,25 380 455 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
  9. 9. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 9 Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ruoät ñoàng , caùch ñieän PVC, voû PVC, coù giaùp baûo veä, ñi trong oáng ñôn tuyeán choân trong ñaát Current ratings and Voltage drop for Copper conductors, PVC insulated, armoured, PVC oversheathed cables, Run in single way ducts Baûng 14 ( Table 14 ) Tieát dieän ruoät daãn Nominal area of conductor 1 loõi (Single core) 2 loõi Two core 3 vaø 4 loõi Three and four core2 caùp : oáng tieáp xuùc nhau Two cables : ducts touching 3 caùp: oáng xeáp theo hình ba laù tieáp xuùc nhau Three cables: ducts trefoil touching Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 1,5 30 34 28 27 26 29 22 25 2,5 41 22 35 16 34 17 29 15 4 59 12 48 10.5 45 11 38 9,5 6 69 10 60 7.0 57 7,4 48 6,4 10 90 5.0 84 4.0 76 4,4 64 3,8 16 114 3.4 107 2.6 98 2,8 83 2,4 25 150 2.0 139 1.6 129 1,7 107 1,5 35 175 1.4 168 1.2 154 1,3 129 1,1 50 216 1,0 199 0,88 183 0,94 153 0,82 70 262 0,76 241 0,66 225 0,66 190 0,57 95 308 0,61 282 0,53 271 0,49 228 0,42 120 341 0,54 311 0,47 309 0,40 260 0,35 150 375 0,48 342 0,42 346 0,34 292 0,29 185 414 0,44 375 0,38 393 0,29 331 0,25 240 463 0,40 419 0,34 455 0,24 382 0,21 300 509 0,37 459 0,32 510 0,21 428 0,18 400 545 0,34 489 0,30 574 0,19 490 0,17 500 585 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: 1,20 Cm/W Nhieät ñoä ñaát : 150 C Ñoä saâu choân caùp : 0,5m (tính ñeán taâm cuûa oáng ñôn chöùa caùp hoaëc taâm cuûa moät nhoùm oáng hình ba laù chöùa caùp) Nhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 700 C Chæ neân cho caùp lieân tuïc mang ñuû doøng ñieän ñònh möùc khi doøng ñieän toái thieåu cuûa maïch baûo veä khoâng vöôït quaù 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 theùp cho caùp moät loõi trong löôùi ñieän xoay chieàu. Moãi oáng chæ chöùa moät sôïi caùp Basic assumptions and conditions of installation Ground thermal resistivity 1.2 0 C m/W Ground temperature 15 0 C Depth of laying 0. 5 metre (to the centre of duct or trefoil group of ducts group of cables) Maximum operating conductor temperature at rated current 700 C Cables shall only be continuously operated at their full rating if the minimum current at which circuit protection is designed to operate does not exceed 1,45 times the values tabulated Method of installation: The 'term" applies to a single earthenware, fibre or ferrous pipe except that in the case of single core cables for use in ac systems, ferrous ducts should not be employed. Rating are given for ducts containning 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 caùp Cable overall diameter (mm) Kích thöôùc oáng (Size of duct) Ñöôøng kính trong Inside diameter (mm) Ñöôøng kính ngoaøi Outside diameter (mm) Nhoû hôn hoaëc baèng 65 Up to and including 65 100 130 Töø 65 ñeán 90 Above 65 up to and including 90 125 160
  10. 10. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 10 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 ñaát Ground temperature (0 C) 20 25 30 35 40 45 Heä soá hieäu chænh Rating factor 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 caùp Type &Size of cable (mm2 ) Nhieät trôû suaát cuûa ñaát Soil thermal resistivity in 0 Cm/W 0,8 0,9 1,0 1,5 2,0 2,5 Caùp 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) 1,10 1,11 1,12 1,07 1,08 1,08 1,04 1,05 1,05 0,94 0,93 0,93 0,86 0,85 0,84 0,80 0,79 0,78 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) 1,04 1,06 1,07 1,03 1,04 1,05 1,02 1,03 1,03 0,97 0,95 0,95 0,92 0,90 0,88 0,88 0,85 0,83 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 caùp Depth of laying (m) 600/1000 V Caùp moät loõi (Single core) Caùp nhieàu loõi (Multicore ) 0,50 1,00 1,00 0,60 0,98 0,99 0,80 0,95 0,96 1,00 0,93 0,98 1,25 0,91 0,96 1,50 0,89 0,95 1,75 0,88 0,94 2,00 0,87 0,93 2,50 0,86 0,92 3,00 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 aùp duïng cho 1 maïch goàm 1 caùp nhieàu loõi hoaëc goàm 2,3 caùp moät loõi. Khi soá maïch nhieàu hôn thì doøng ñònh möùc phaûi ñöôïc hieäu chænh , heä soá hieäu chænh cho trong baûng 19 Effect of grouping of cables The current ratings given apply to one multicore cable, or a single set of single core cables forming a circuit. When two or more circuits are laid in close proximity the ratings of the cables must be reduced by the group rating factors given on the table 19
  11. 11. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 11 Heä soá hieäu chænh doøng ñònh möùc cho caùc maïch cuûa caùp 1 loõi , ñaët theo hình ba laù hay trong oáng ñôn tuyeán Group rating factores for circuits of single core cables, in trefoil single way ducts, horizontal formation Baûng 19 (Table 19) Soá maïch (Number of circuits) Khoaûng caùch ( Spacing) (m) Tieáp xuùc tröïc tieáp (Touching) 0,45 0,6 2 0,87 0,91 0,93 3 0,78 0,84 0,87 4 0,74 0,81 0,85 5 0,70 0,79 0,83 6 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 ngang Group rating factors for Multicore cables insingle way ducts horizontal formation Baûng 20 (Table 20) Soá oáng cuûa nhoùm (Number of ducts in group) Khoaûng caùch ( Spacing) (m) Tieáp xuùc tröïc tieáp (Touching) 0,3 0,45 0,6 2 0,90 0,93 0,95 0,96 3 0,83 0,88 0,91 0,93 4 0,79 0,85 0,89 0,92 5 0,75 0,83 0,88 0,91 6 0,73 0,82 0,87 0,90 I.1.2/ Ñoä suït aùp: Moät yeáu toá quan troïng khaùc phaûi xem xeùt khi choïn côõ 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 caùp IEE 522-8 quy ñònh ñoä suït aùp khoâng ñöôïc vöôït quaù 2.,5% ñieän aùp danh ñònh Vôùi maïch 1 pha 220V ñoä suït aùp cho pheùp 5.5V Vôùi maïch 3 pha 380V ñoä suït aùp cho pheùp 9.5V. Khi suït aùp lôùn hôn möùc cho pheùp thì khaùch haøng phaûi choïn caùp coù tieát dieän ruoät daãn lôùn hôn. I.1.2/ Voltage drop Another important factor for the determination of the conductor size is the voltage drop. The voltage drop of the cable at a given current is caused by losses in the cable. In case of a too high voltage drop, it is necessary to choose a bigger conductor size. The voltage drop in a cable denotes the difference in voltage at the beginnining and at the end 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 the circuit voltage. According to IEE regulation 522-8, it is stipulated that the total voltage drop for any particular cable run must be such that the voltage drop in the circuit of which the cable forms a part does not exceed 2,5% of the nominal voltage. For single phase circuit 220V, maximum voltage drop is 5,5V For three phase circuit 380V, maximum voltage drop is 9,5V spacing spacing
  12. 12. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 12 Choïn caùp döïa vaøo ñoä suït aùp vaø doøng ñieän ñònh möùc Thöôøng thì heä soá coâng suaát cuûa taûi khoâng ñöôïc bieát neân thoâng thöôøng giaû ñònh tröôøng hôïp xaáu nhaát luùc hscs =1 vaø ruoät daãn laøm vieäc ôû nhieät ñoä toái ña cho pheùp. Khi ñoù: V=Vd x I x L Vôùi V : ñoä suït aùp Vd : ñoä suït aùp gaàn ñuùng mV/A/m I : 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 most practical approach to the question of the voltage drop is to assume the worst conditions, i.e power factor equal to one and the conductor is at maximum operating temperature. The voltage drop values given in the tables are based on these assumptions. V=Vd x I x L Where V : Voltage drop Vd : Approximate Voltage drop mV/A/m I : Current in Ampere per phase that the cable are to carry L : Route length in metres Duøng baûng : Ví duï 1: Xem xeùt moät ñoaïn caùp treân khoâng loaïi AVV/SWA 4 loõi , daøi 200m, mang taûi 100A, 3 pha, 415 V, 50Hz Ta coù Vd I L  10400 Neân Vd  100200 10400 x Vd  0,52 Choïn trong baûng 1coät 9 seõ ñöôïc loaïi caùp 150m2 , taûi doøng ñieän 100A, coù ñoä suït aùp V= 0,45 Using tables Exemple: 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, three phase 50Hz, and the cable to be AVV/ SWA. Vd I L  10400 Vd  100200 10400 x Vd  0,52 Select a cable from Table 1such that the Vd from column 9 is equal to or less than the current. It will be seen that this value is 052 giving a cable size of 150 mm2 . Duøng ñoà thò : a) Ñieän aùp cung caáp laø 240/415 V Ví duï 1 : Vôùi ví duï treân vaø duøng ñoà thò hình 2, vôùi giaù trò doøng ñieän taûi 100A vaø chieàu daøi caùp 200m seõ choïn ñöôïc caùp coù tieát dieän 150 mm2 Using selection guides a) 240/415 V supply Example 1: Using the "Size selection guide" Figure 2 and taking the same example as previously, the values of current (100 amps) and route length (200 metres) indicate that a 150 mm2 conductor is required. Although the example mentions cables in air, this size would be required under any conditions of installation (since the current/route length location point is not within the shaded area of the chart). Ví duï 2 : Xeùt 1 ñoaïn caùp CVV/SWA 4 loõi , daøi 110m., taûi doøng ñieän 300A , 3 pha 415V, 50Hz - Khi caùp choân tröïc tieáp trong ñaát : Ñoà thò ôû hình 4 chæ ra côõ caùp phaûi laø 150mm2 - Khi caùp ñi trong oáng : do giao ñieåm giöõa doøng ñieän vaø chieàu daøi caùp naèm trong vuøng maøu xaùm neân khi xem baûng 14, seõ thaáy côõ caùp 150mm2 chæ taûi ñöôïc doøng ñieän 292A. Vì theá khaùch haøng phaûi choïn côõ caùp 185mm2 ñeå taûi doøng ñieän 300A b) Khi ñieän aùp cung caáp khaùc 240/ 415 V Caùc ñoà thò chæ ñöôïc thieát laäp ñoái vôùi ñieän aùp 240/415V, vì vaäy khi ñieän aùp cung caáp khaùc giaù trò naøy thì phaûi nhaân chieàu daøi caùp vôùi heä soá cho trong baûng döôùi ñaây vaø sau ñoù môùi duøng caùc ñoà thò thieát laäp cho ñieän aùp 240/415 V. Example 2: Consider a route of 110 metres of cable carrying 300 amps, the supply voltage being 415volts, three phase 50Hz, the cable to be 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 will be required. - In single way duct: but the current/route length location point falls within the shaded area of the chart, it is therefore necessary to check for the current carrying capability of 150 mm2 when in ducts from Table 14 , which shows that this size will only carry 292 amps. Therefore it is necessary to specify a 185 mm2 conductor size to be capable of carrying the 300 amp current. b) Supply voltages other than 240/415V the cable selection guides are based on a voltage of 240/415V, but can easily be adapted for other voltages by the application of a multiplication factor to the actual route length, and then using this notional route length for the selection of the conductor size from the guides Baûng 21 (Table 21) Ñieän aùp (Voltage) 220/380 V 230/400 V 255/440 V Heä soá nhaân (Multiplying factor) 1,09 1,04 0,96
  13. 13. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 13 Ví duï : Xem xeùt moät ñoaïn caùp ruoät nhoâm , giaùp sôïi theùp baûo veä (AVV/SWA) , 4 loõi, daøi 100m , taûi doøng ñieän 150A, 3 pha, 380V, 50Hz, caùp choân trong ñaát. Vì giaù trò ñieän aùp cung caáp laø 380V neân ta nhaân chieàu daøi thöïc cuûa caùp (100m) vôùi heä soá cho trong baûng 21 (1,09) ta coù : Chieàu daøi giaû ñònh = 100 x 1,09 = 109 m Theo hình 2 , vôùi doøng taûi 150A, chieàu daøi giaû ñònh 109m seõ cho caùp coù tieát dieän 120 mm2 . Example : Consider a route length of 100 metres of cable carrying 150 amps, the supply voltage being 380 volts, three phase 50Hz, and the cable to be four core SAC PVC/SWA/PVC installed direct in the ground. 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 m From figure 2 the values of the current (150 amps) and the notional route length (109m) indicate that 120 mm2 conductor size will be required. I.1.3/ Doøng ñieän ngaén maïch Moät thoâng soá quan troïng nöõa aûnh höôûng ñeán vieäc choïn tieát dieän ruoät daãn laø doøng ñieän ngaén maïch toái ña cho pheùp . Doøng ñieän ngaén maïch toái ña cho pheùp cuûa caùp caùch ñieän PVC ñieän aùp ñeán 1 kV ñöôïc tính theo coâng thöùc ôû baûng 22 vaø ñöôïc dieãn giaûi treân caùc hình 5,6. I.1.3/ Short circuit current Another important factor for the determination of the conductor size is the maximum allowable current during a short circuit. The maximum permissible short circuit current of PVC cables up to 1kV can be calculated with the following formulas. In table 22 and illustrated in fig 5,6. Baûng 22 (Table 22) Côõ caùp (Cable type) Ruoät daãn (Conductor) Ñoä taêng nhieät ñoä Temperature rising (0 C) Doøng ñieän ngaén maïch toái ña Max.short circuit current (A) PVC Nhoû hôn hoaëc baèng 300 mm2 Up to 300 mm2 Ñoàng (Copper) 70-160 115 S t -1/2 Nhoâm (Aluminium) 70-160 76 S t -1/2 Lôùn hôn 300 mm2 Over 300 mm2 Ñoàng (Copper) 70-140 103 S t -1/2 Nhoâm (Aluminium) 70-140 68 S t -1/2 S : Tieát dieän ruoät daãn (Conductor area, mm2 ) t : Thôøi gian ngaén maïch (Short circuit duration , seconds)
  14. 14. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 14 I.2 CAÙP ÑIEÄN LÖÏC CAÙCH ÑIEÄN XLPE I.2.1/ Doøng ñieän ñònh möùc vaø ñoä suït aùp: I.2.1.1/ Caùp treân khoâng I.2/ XLPE INSULATED POWER CABLE I.2.1/ Current rating and voltage drop II.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 khoâng Current ratings and Voltage drop for Copper conductors, XLPE insulated, unarmoured, PVC oversheathed cables, Installed in air Baûng 23 ( Table 23) Tieát dieän ruoät daãn Nom. area of cond. Caùp 1 loõi ( Single core cable ) Caùp nhieàu loõi ( Multicore cable ) 2 caùp 1 loõi tieáp xuùc 2-single core Touching 3 caùp 1 loõi tieáp xuùc 3-single core Touching 3 caùp 1loõi ñaët theo hình 3 laù 3-single core Trefoil 3 caùp 1loõi ñaët caùch khoaûng theo maët phaúng ngang 3-single core Spaced Horizontal 3 caùp 1loõi ñaët caùch khoaûng theo maët phaûng ñöùng 3-single core Spaced Vertical Caùp 2 loõi 2 Loaded conductor Caùp 3 loõi 3 Loaded conductor A B C D E F G Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV A A mV A mV 1,5 28 30,86 25 26,73 24 26,73 29 26,73 28 26 29 23 27.7 2,5 37 18,90 34 16,37 33 16,37 39 16,37 38 36 18.0 32 17.3 4 52 11,76 44 10,19 43 10,19 54 10,19 53 49 11.6 42 11 6 66 7,86 55 6,81 52 6,81 68 6,81 67 63 7.7 54 6.9 10 91 4,67 79 4,04 75 4,04 93 4,05 92 86 4.6 75 4.1 16 118 2,95 110 2,55 107 2,55 120 2,56 119 115 2,9 100 2,6 25 161 1,87 141 1,62 135 1,62 182 1,63 161 149 1,9 127 1,6 35 200 1,35 176 1,17 169 1,17 226 1,19 201 185 1,3 157 1,2 50 242 1,01 215 0,88 207 0,87 275 0,90 246 225 1,0 192 0,87 70 310 0,71 279 0,62 268 0,61 353 0,65 318 289 0,70 246 0,61 95 377 0,52 341 0,45 328 0,45 430 0,50 389 352 0,52 298 0,45 120 437 0,43 399 0,38 382 0,37 500 0,42 454 410 0,42 346 0,36 150 504 0,36 462 0,33 443 0,32 577 0,37 527 473 0,35 399 0,30 185 575 0,30 531 0,28 509 0,26 661 0,33 605 542 0,29 456 0,25 240 679 0,25 631 0,24 604 0,22 781 0,29 719 641 0,24 538 0,21 300 783 0,22 731 0,21 699 0,20 902 0,28 833 741 0,21 620 0,19 400 940 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 300 c (Ambient temperature 300 C) Nhieät ñoä ruoät daãn toái ña 900 c ( Maximum Conductor temperature 900 C) Ghi chuù : Heä soá hieäu chænh khi gheùp nhoùm cho caùch laép töø A ñeán E xem baûng 24 Heä soá hieäu chænh khi gheùp nhoùm cho caùch laép G , F xem baûng 25 d1 : khoaûng xa töôøng khoâng nhoû hôn ñöôøng kính caùp d2 : toái thieåu 0,3 laàn ñöôøng kính caùp Note: Group installation correction factor for methods A to E. please reter to Table 24 Group installation correction factor for methods F, G. please reter to Table 25 Correction factors for ambient air temperature other than 300 C, please refer to Table 26 d1 : Clearance to wall not less than one cable diameter d2 : Minimum 0,3 times the diameter of cable.
  15. 15. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 15 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm nhieàu maïch caùp 1 loõi Ñeå duøng cuøng baûng 23 cho caùp 1 loõi treân khoâng khi laép theo caùch töø A ñeán E Correction factors for Groups of more than one circuit of Single core Cables To 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 nhaân ñeå hieäu chænh doøng ñònh möùc cho Use as a multiplier to rating for Soá khay Numbers of 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 maët ngang Three cables in Horizontal formation 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 naèm ñöùng ( ghi chuù 3) Vertical perforated trays (Note 3) K 1 0,95 0,85 - 3 caùp ñaët theo maët ñöùng Three cables in Vertical 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 maët ngang Three cables in Horizontal formation 2 0,95 0,90 0,90 3 0,95 0,90 0,85 Khay khoâng ñuïc loã (ghi chuù 2) Unperforated trays (Note 2) H 1 1,00 0,95 0,95 3 caùp ñaët theo hình 3 laù Three cables in Trefoil formation 2 0,95 0,90 0,85 3 0,95 0,90 0,85 Khay coù ñuïc loã (ghi chuù 2) Perforated trays (Note 2) 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 naèm ñöùng ( 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 supports cleats, 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 giaûm 4)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 an appropriate 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 reduced 4)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.
  16. 16. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 16 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm nhieàu maïch caùp nhieàu loõi Ñeå duøng cuøng baûng 23 cho caùp nhieàu loõi treân khoâng khi laép theo caùch F vaø G Correction factors for Groups of more than one circuit of Multicore Cables To be used in conjunction with current ratings in Table 23 for Multicore cables in free air for installation methods F& G Baûng 25 ( Table 25) Caùch laép ñaët (Xem ghi chuù 1) Installation method (See note 1) Soá khay Numbers of trays Soá caùp Number of cable 1 2 3 4 6 9 Khay khoâng ñuïc loã (ghi chuù 2) Unperforated trays (Note 2) 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 - Khay coù ñuïc loã (ghi chuù 2) Perforated trays (Note 2) 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 loã thaúng ñöùng ( ghi chuù 3) Vertical perforated trays (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 supports cleats, 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 appropriate 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 reduced
  17. 17. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 17 Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä khoâng khí thay ñoåi Correction factors for ambient air temperature other than 300 C Baûng 26 (Table 26) Nhieät ñoä khoâng khí Ambient temperature 0 C 10 15 20 25 35 40 45 50 55 60 65 70 75 80 Heä soá hieäu chænh Correction 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 ñaát Current ratings and Voltage drop for Copper conductors, XLPE insulated, armoured, PVC oversheathed cables, Laid direct in ground Baûng 27 (Table 27) Tieát dieän ruoät daãn Nom. 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 löôùi ñieän xoay chieàu 1 pha Two cables touching, single-phase (ac) 3 caùp tieáp xuùc nhau theo hình 3 laù , 3 pha Three cables trefoil touching, 3-phase Caùp 2 loõi , löôùi ñieän xoay chieàu 1 pha Two core cable , single-phase (ac) Caùp 3 hay 4 loõi Three or four core Cable Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 16 142 2,9 135 2,57 140 2,90 115 2,60 25 185 1,88 172 1,55 180 1,90 150 1,60 35 226 1,27 208 1,17 215 1,30 180 1,20 50 275 0,99 235 0,86 255 1,00 215 0,87 70 340 0,70 290 0,61 315 0,70 265 0,61 95 405 0,53 345 0,46 380 0,52 315 0,45 120 460 0,43 390 0,37 430 0,42 360 0,36 150 510 0,37 435 0,32 480 0,35 405 0,30 185 580 0,31 490 0,27 540 0,29 460 0,25 240 670 0,26 560 0,23 630 0,24 530 0,21 300 750 0,24 630 0,21 700 0,21 590 0,19 400 830 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 0 Cm/W Nhieät ñoä ñaát : 150 C Ñoä saâu choân caùp : 0,5m Nhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 900 C Basic assumptions and conditions of installation Soil thermal resistivity 1.2 0 C m/W Ground temperature 15 0 C Dep th of lay ing 0. 5 metre Maximum operating conductor temperature at rated current: 900 C. Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä ñaát thay ñoåi cho trong baûng 28 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm cho trong baûng 29 Correction factors for ground temperatures other than 150 C, refer to Table 28 For group correction factors, please refer to Table 29 Heä soá hieäu chænh doøng ñònh möùc khi nhieät ñoä ñaát thay ñoåi Correcion factors for ground temperatures other than 150 C Baûng 28 (Table 28) Nhieät ñoä ñaát Ground temperature (0 C) 10 15 20 25 30 35 40 45 50 Heä soá hieäu chænh Correction factors 1,03 1,00 0,97 0,93 0,89 0,86 0,82 0,76 0,72
  18. 18. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 18 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm Group 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 hôû baèng ñöôøng kính moät caùp a= One cable diameter 0,215 m 0,25 m 0,5 m 2 0,75 0,80 0,85 0,90 0,90 3 0,65 0,70 0,75 0,80 0,85 4 0,60 0,60 0,70 0,75 0,80 5 0,55 0,55 0,65 0,70 0,80 6 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 ñaát Current ratings and Voltage drop for Copper conductors, XLPE insulated, armoured, PVC oversheathed cables, Run in single way ducts Baûng 30 (Table 30) Tieát dieän ruoät daãn Nom. 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 : oáng ñaët tieáp xuùc Two cables: ducts touching 3 caùp : oáng ñaët tieáp xuùc theo hình 3 laù Three cables : ducts touching, trefoil Caùp 2 loõi Two core cable Caùp 3 hay 4 loõi Three or four core Cable Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV A mV A mV A mV 16 140 3,0 130 2.70 115 2,90 94 2,60 25 180 2,0 170 1,80 145 1,90 125 1,60 35 215 1,4 205 1,25 175 1,30 150 1,20 50 255 1,10 235 0,93 210 1,00 175 0,87 70 310 0,80 280 0,70 260 0,70 215 0,61 95 365 0,65 330 0,56 310 0,52 260 0,45 120 410 0,55 370 0,48 355 0,42 300 0,36 150 445 0,50 405 0,43 400 0,35 335 0,30 185 485 0,45 440 0,39 455 0,29 380 0,25 240 550 0,40 500 0,35 520 0,24 440 0,21 300 610 0,37 550 0,32 590 0,21 495 0,19 400 640 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 0 Cm/W Nhieät ñoä ñaát : 150 C Nhieät ñoä khoâng khí : 250 C Ñoä saâu choân caùp : 0,5m Nhieät ñoä laøm vieäc toái ña cuûa ruoät daãn laø 900 C Basic assumptions and conditions of installation Soil thermal resistivity 1.2 0 C m/W Ground temperature 15 0 C Ambient air temperature 25 0 C Dep th of lay ing 0. 5 metre Maximum operating conductor temperature at rated current: 900 C. Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä ñaát thay ñoåi cho trong baûng 28 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm cho trong baûng 31 Correcion factors for ground temperatures other than 150 C, refer to Table 28 For group correcion factors, please refer to Table 31
  19. 19. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 19 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm, söû duïng ñeå hieäu chænh doøng ñònh möùc cho trong baûng 30 Group correcion factors- to be used in conjunction with ratings for cables in table 30 Baûng 31 (Table 31) Caùp moät loõi Soá maïch (Number of single-core circuits of two or three 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 0,95 3 0,70 0,80 0,85 0,90 4 0,65 0,75 0,80 0,90 5 0,60 0,70 0,80 0,90 6 0,60 0,70 0,80 0,90 Caùp nhieàu loõi Soá caùp (Number of 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 0,85 0,90 0,95 0,95 3 0,75 0,85 0,90 0,95 4 0,70 0,80 0,85 0,90 5 0,65 0,80 0,85 0,90 6 0,60 0,80 0,80 0,90 II.1.1.4/ Caùp ñi trong oáng trong maùng vaø boù caùp raûi treân beà maët II.1.1.4/ Cable in conduit and trunking and bunched cables on a surface Doøng ñieän ñònh möùc cuûa caùp ruoät ñoàng, caùch ñieän XLPE, voû PVC giaùp baûo veä, ñi trong oáng trong maùng Current ratings for Copper conductors, XLPE insulated, armoured, PVC oversheathed cables, Cable in conduit and trunking and bunched cables on a surface) Baûng 32 (Table 32) Tieát dieän ruoät daãn Nom. area of cond. Caùp 1 loõi ñi trong oáng choân trong töôøng Insulated conductors in conduit in insulating wall Caùp 1 loõi ñi trong oáng ñaët treân töôøng Insulated conductors in conduit on wall Caùp nhieàu loõi ñaët treân töôøng Multicore cable on a wall R S T 2 sôïi caùp 2 Loaded conductor 3 sôïi caùp 3 Loaded conductor 2 sôïi caùp 2 Loaded conductor 3 sôïi caùp 3 Loaded conductor 2 sôïi caùp 2 Loaded conductor 3 sôïi caùp 3 Loaded conductor mm2 A A A A A A 1,5 19 17 23 20 24 22 2,5 26 23 31 27 33 30 4 35 31 42 37 45 40 6 45 40 54 48 58 52 10 61 54 74 66 80 71 16 81 73 100 89 107 96 25 106 95 133 117 138 119 35 131 117 164 144 171 147 50 158 141 198 175 210 179 70 200 179 254 222 269 229 95 241 216 306 269 328 278 120 278 249 354 312 382 322 150 318 285 - - 441 371 185 362 324 - - 506 424 240 424 380 - - 599 500 300 486 435 - - 693 576 400 579 519 - - 860 692 500 664 595 - - 994 797 630 765 685 - - 1155 923 800 885 792 - - 1349 1074 1000 1014 908 - - 1560 1237 Nhieät ñoä khoâng khí : 300 C Nhieät ñoä toái ña cuûa ruoät daãn laø 900 C Ambient air temperature 30 0 C Maximum conductor temperature : 900 C Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä kh6ng khí thay ñoåi cho trong baûng 28 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm cho trong baûng 33 Correcion factors for ambient temperatures other than 300 C, refer to Table 28 For group correcion factors, please refer to Table 33
  20. 20. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 20 Heä soá hieäu chænh doøng ñieän ñònh möùc khi gheùp nhoùm- Söû duïng ñeå hieäu chænh doøng ñieän ñònh möùc cho trong baûng 32 Group correcion factors- to be used in conjunction with ratings for cables in table 32 Baûng 33 (Table 33) Item Caùch ñaët caùp Arrangement of cables Correction factors Number of circuits or multicore cables 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20 1 Boù caùp raûi treân maët hay ñi trong oáng, trong maùng Bunched on a surface or enclosed in conduit or trunking 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 treân töôøng hay neàn nhaø Single-layer wall or floor Tieáp xuùc Touching 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 3 Caùch khoaûng Spaced 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 döôùi traàn nhaø Single-layer under ceiling Tieáp xuùc Touching 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 5 Caùch khoaûng Spaced 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 nhau 2) 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 chænh 3) 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 loaded 2) Where horizontal clearance between adjacent cables exceeds twice their overall diameter, no reduction factor need be applied 3) 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/3 circuits of three loaded conductors. Baûng 34 ( Table 34) Ruoät daãn Conductor Ñoä taêng nhieät ñoä Temperature rising (0 C) Doøng ñieän ngaén maïch toái ña Max.short circuit current (A) XLPE Ñoàng (Copper) 90-250 143 S t -1/2 Nhoâm (Aluminium) 90-250 92 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
  21. 21. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 21 II/ CAÙP ÑIEÄN KEÁ II.1/ CAÙCH ÑIEÄN PVC II/ SERVICE ENTRANCE CABLE II.1/ PVC INSULATED Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieän keá caùch ñieän PVC, voû PVC- kyù hieäu DKCVV Current ratings and Voltage drop for Copper conductors, PVC insulated, PVC sheathed service entrance cable Gioáng baûng 4phaàn caùp ñieän löïc boïc PVC. II.2/ CAÙCH ÑIEÄN XLPE II.2/ XLPE INSULATED Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieän keá caùch ñieän XLPE, voû PVC hoaëc HDPE –kyù hieäu DKCXV, DKCXE Current ratings and Voltage drop for Copper conductors, PVC insulated, PVCor HDPE sheathed service entrance cable Gioáng baûng 23,coät F,G. III/ CAÙP ÑIEÀU KHIEÅN III.1/ CAÙCH ÑIEÄN PVC III/ CONTROL CABLES III.1/ PVC INSULATED Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieàu khieån, caùch ñieän PVC, voû PVC-kyù hieäu DVV Current ratings and Voltage drop for Copper conductors, PVC insulated, PVC sheathed, Control Cables Baûng 35 ( Table 35) Côõ caùp Conductor size Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV Caùp treân khoâng ( nhieät ñoä khoâng khí laø 300 C, nhieät ñoä ruoät daãn toái ña laø 700 C) In air ( ambient temperature 300 C, maximum conductor temperature 700 C) 1,5 18 25 2,5 25 15 4 33 9,5 6 42 6,4 10 58 3,8 16 77 2,4 III.2/ CAÙCH ÑIEÄN XLPE III.2/ XLPE INSULATED Doøng ñieän ñònh möùc vaø ñoä suït aùp cuûa caùp ñieàu khieån, caùch ñieän XLPE, voû PVC-kyù hieäu DXV Current ratings and Voltage drop for Copper conductors, XLPE insulated, PVC sheathed, Control Cables Baûng 36 ( Table 36) Côõ caùp Conductor size Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 A mV Caùp treân khoâng ( nhieät ñoä khoâng khí laø 300 C, nhieät ñoä ruoät daãn toái ña laø 900 C) In air ( ambient temperature 300 C, maximum conductor temperature 900 C) 1,5 22 27 2,5 31 17 4 42 10 6 54 6,8 10 74 4,1 16 99 2,6 IV/ CAÙP MULTIPLEX IV/ MULTIPLEX CABLE Doøng ñieän ñònh möùc cuûa caùp Multiplex, boïc PVC hoaëc XLPE Current ratings for Nonsheathed, PVC or XLPE insulated Multiplex Cable Baûng 37 (Table 37) Côõ caùp Conductor size Duplex Triplex Quadruplex CV AV CX AX CV AV CX AX CV AV CX AX mm2 A A A A A A A A A A A A 4 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 58 16 87 70 115 92 79 63 110 78 76 61 108 78 25 114 91 149 119 104 83 135 105 101 80 130 105 35 140 112 185 148 129 103 169 125 125 100 164 125 50 189 151 225 180 167 133 207 150 151 120 202 150 70 215 172 289 230 214 171 268 185 192 153 262 185
  22. 22. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 22 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 XLPE Current ratings and Voltage drop for Nonsheathed, PVC or XLPE insulated Cable Baûng 38 ( Table 38) Côõ caùp Conductor size Daây ñieän löïc boïc PVC Nonsheathed, PVC insulated Cable Daây ñieän löïc boïc XLPE Nonsheathed, XLPE insulated Cable CV AV CX AX Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre Doøng ñieän ñònh möùc Current ratings Ñoä suït aùp Approximate volt drop per amp per metre mm2 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 4,8 25 114 1,55 91 2,5 149 1,9 119 3,1 35 140 1,10 112 1,8 185 1,35 148 2,2 50 189 0,82 151 1,35 225 0,87 180 1,4 70 215 0,57 172 0,92 289 0,62 230 0,98 95 260 0,42 208 0,67 352 0,47 281 0,74 120 324 0,35 259 0,54 410 0,39 328 0,60 150 384 0,29 307 0,45 473 0,33 378 0,49 185 405 0,25 324 0,37 542 0,28 430 0,41 240 518 0,21 414 0,30 641 0,24 512 0,34 300 570 0,19 456 0,25 741 0,21 592 0,29 400 660 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 300 C Nhieät ñoä ruoät daãn laø 700 C Ambient temperature 300 C Maximum conductor temperature 700 C
  23. 23. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 23 VI/ DAÂY ÑIEÄN BOÏC NHÖÏA PVC VI/ PVC INSULATED WIRE Doøng ñieän ñònh möùc cuûa daây ñieän boïc nhöïa PVC Current ratings of PVC insulated wire Baûng 39 ( Table 39) Daây ñoâi meàm, ruoät ñoàng Flexible Copper conductor – PVC insulated wire Daây ñôn cöùng, ruoät ñoàng hoaëc nhoâm Solid Copper or Aluminium conductor – PVC insulated wire Soá loõi Num. of core Tieát dieän Nom. area of conductor Daây ñoâi meàm deït, meàm xoaén VCmd , VCmx Daây ñoâi meàm troøn, meàm ovan, meàm oval deït VCmt , VCmo , VCmod Tieát dieän Nom. area of conductor Ñöôøng kính sôïi Diameter of wire VC Ruoät ñoàng Copper conductor VA Ruoät nhoâm Aluminium conductor mm2 A A mm2 mm A A 2 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 23 2 2,0 16 17 3 2,0 35 26 2 2,5 18 20 4 2,25 42 32 2 3,5 - 24 5 2,60 48 36 2 4,0 - 27 6 2,78 51 39 2 5,5 - 32 7 3,0 57 43 2 6,0 - 36 VII/ DAÂY ÑOÀNG TRAÀN XOAÉN, DAÂY NHOÂM TRAÀN XOAÉN VAØ DAÂY NHOÂM LOÕI THEÙP VII/ BARE STRANDED COPPER AND ALUMINIUM CONDUCTOR AND ALUMINIUM CONDUCTOR STEEL REINFORCED Doøng ñieän ñònh möùc cuûa daây ñoàng traàn xoaén, daây nhoâm traàn xoaén Current ratings of Bare stranded copper conductor, Bare stranded aluminium conductor Baûng 40 ( Table 40) Tieát dieän Nom. area of conductor Daây ñoàng traàn xoaén Bare stranded copper conductor C Daây nhoâm traàn xoaén Bare stranded aluminium conductor A Doøng ñieän ñònh möùc Current ratings Doøng ñieän ñònh möùc ôû vuøng oân ñôùi. Temperate Current ratings. mm2 A A 4 50 - 6 70 - 10 95 - 14 120 - 16 130 105 25 180 135 35 220 170 38 230 182 50 270 215 60 305 225 70 340 265 80 377 276 95 415 320 100 450 340 120 485 375 125 500 390 150 570 440 185 640 500 240 760 590 300 880 680 325 943 710 400 1050 815 500 1254 980 630 1497 1170 800 1662 1330
  24. 24. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 24 ACSR Baûng 41 ( Table 41) Tieát dieän Nom. area of conductor Daây nhoâm loõi theùp Aluminium conductor steel reinforced Doøng ñieän ñònh möùc ôû vuøng oân ñôùi Tem perate Current ratings Doøng ñieän ñònh möùc ôû vuøng nhieät ñôùi Tropical 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 -
  25. 25. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 25 B
  26. 26. CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI) 26 C/ LAÉP ÑAËT I/ 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 6D Giaùp 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 tensile Baûng 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 daãn With pulling head attached to conductor Taát caû caùc loaïi caùp All type of cable P=. A  = 50 N/mm2 ( Cu- conductor)  = 30 N/mm2 ( Al- conductor) Ñaàu keùo keïp vaøo ñaàu caùp With pulling stocking Caùp khoâng giaùp hoaëc giaùp baêng Cable unarmoured or double tape armour P=. A  = 50 N/mm2 ( Cu- conductor)  = 30 N/mm2 ( Al- conductor) Caùp giaùp sôïi Wire 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 caùp Aùp suaát toái ña cho pheùp taùc duïng leân caùp taïi ñieåm uoán trong khi laép ñaët laø 500kg/m III./ Side wall pressure to cable Permissible maximum side wall pressure to the cable at bending point during installation is 500 kg/m IV / Taùch voû caùp Thao taùc caån thaän keûo hoûng lôùp caùch ñieän vaø sinh ñaùnh thuûng caùp. IV / Removal of sheath or tape Special care must be taken not to harm the insulation. When removing the sheath with a knife otherwise it may result in a dielectric breakdown V / Laøm saïch beà maët lôùp caùch ñieän Phaûi laøm saïch beà maët lôùp caùch ñieän ñeå khoâng bò phoùng ñieän taïi ñaàu noái V/ Cleaning the surface of insulation The surface of insulation should be cleaned to avoid a flash over at the cable termination or joint VI/ Xöû lyù choáng thaám nöôùc cho ñaàu noái ngoaøi trôøi Ñaàu noái ngoaøi trôøi phaûi ñöôïc xöû lyù choáng thaám nöôùc vaø quaán baêng caån thaän ñeå nöôùc khoâng luoàn vaøo ñaàu caùp. VI/ Water proof treatment for out-door termination For out-door termination water proof treatment is necessan to avoid the water penetrating to the cable end and special care must be taken to apply tapes end terminals. D / HÖÔÙNG DAÃN ÑAËT HAØNG CAÙP HAÏ THEÁ Khi ñaët haøng xin quí khaùch vui loøng thoâng baùo cho CADIVI nhöõng 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 GUIDELINES The purchaser should supply the following information at the time of enquiry and order 1. Length of cable required and individual drum length of important 2. Voltage designation 3. Number of cores 4. Conductor size and where applicable, size of reduced conductor 5. Conductor material i.e copper , aluminum 6. Insulation material, i.e, PVC, XLPE 7. PP yarn or extruded bending 8. Non armour, double steel tape armour, double aluminum tape armour, Aluminum wire armour 9. Sheath material 10. Applied standard TCVN, ASTM, IEC, BS, DIN, AS

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