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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
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
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)3
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
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
Baûng 6 ( Table 6)Tieát dieänruoät daãn
Nominalarea of
conductor
1 loõi (Single core ) 2 loõiTwo core
3 vaø 4 loõiThree and four core2 caùp ñaët caùch khoaûng
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
Heä soá hieäu chænhRating factor
0,95 0,90 0,85 0,80 0,74 0,67
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 ñoåiRating factors for variation in thermal resistivity of soil
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
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
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
1 loõi (Single core ) 2 loõiTwo core
3 vaø 4 loõiThree and four core2 caùp : oáng tieáp xuùc nhau
Two cables : ducts touching3 caùp: oáng xeáp theo hình ba laù tieáp
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)
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)
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
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 tuyeánGroup rating factores for circuits of single core cables, in trefoil single way ducts, horizontal formation
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
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
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.
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).
- 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)
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/ 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.
Baûng 22 (Table 22)
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
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)
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.
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)15
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
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.
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)16
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
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
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)17
Heä soá hieäu chænh doøng ñieän ñònh möùc khi nhieät ñoä khoâng khí thay ñoåiCorrection factors for ambient air temperature other than 300C
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
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)18
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
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
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
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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
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
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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
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
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
CTY TNHH Daây & Caùp Ñieän Vieät Nam (CADIVI)21
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
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
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 / 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