Technical 1554 cables specifications
56
TECHNICAL SPECIFICATIONS PAGODA CABLES PVT. LTD. 1/58, STREET NO: 3, VISHWAS NAGAR, SHAHDARA, DELHI 110 032. (INDIA) TEL/FAX : 91-11-22392801, 22385391. Email : pagoda @del2.vsnl.net.in
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Transcript of Technical 1554 cables specifications
TECHNICAL SPECIFICATIONS
PAGODA CABLES PVT. LTD.1/58, STREET NO: 3, VISHWAS NAGAR,
SHAHDARA, DELHI 110 032. (INDIA)TEL/FAX : 91-11-22392801, 22385391.
Email : pagoda @del2.vsnl.net.in
CONTENTS:
1. ABOUT PAGODA
2. PRODUCT RANGE
3. SELECTION OF CABLES
4. QUALITY ASSURANCE PLAN
5. DESIGN & CONSTRUCTION
6. FRLS SHEATHED CABLES.
7. TABLES ON TECHNICAL DATA:
TABLE 1 CONDUCTOR RESISTANCE
TABLE 2 REACTANCE.
TABLE 3 CAPACITANCE
TABLE 4 1.5 SQ.MM. UPTO 61 CORES, ARMOURED/UNARMOURED CONTROL CABLES.
TABLE 5 2.5 SQ.MM. UPTO 61 CORES, ARMOURED/UNARMOURED CONTROL CABLES.
TABLE 6 SINGLE CORE COPPER CONDUCTOR UNARMOURED CABLES.
TABLE 7 TWO CORE COPPER CONDUCTOR UNARMOURED CABLES.
TABLE 8 THREE CORE COPPER CONDUCTOR UNARMOURED CABLES.
TABLE 9 THREE & HALF CORE COPPER CONDUCTOR UNARMOURED CABLES.
TABLE 10 FOUR CORE COPPER CONDUCTOR UNARMOURED CABLES.
TABLE 11 TWO CORE COPPER CONDUCTOR ARMOURED CABLES.
TABLE 12 THREE CORE COPPER CONDUCTOR ARMOURED CABLES.
TABLE 13 THREE & HALF CORE COPPER CONDUCTOR ARMOURED CABLES.
TABLE 14 FOUR CORE COPPER CONDUCTOR ARMOURED CABLES.
TABLE 15 SINGLE CORE ALUMINIUM CONDUCTOR UNARMOURED CABLES.
TABLE 16 TWO CORE ALUMINIUM CONDUCTOR UNARMOURED CABLES.
TABLE 17 THREE CORE ALUMINIUM CONDUCTOR UNARMOURED CABLES.
TABLE 18 THREE & HALF CORE ALUMINIUM CONDUCTOR UNARMOURED CABLES.
TABLE 19 FOUR CORE ALUMINIUM CONDUCTOR UNARMOURED CABLES.
TABLE 20 TWO CORE ALUMINIUM CONDUCTOR ARMOURED CABLES.
TABLE 21 THREE CORE ALUMINIUM CONDUCTOR ARMOURED CABLES.
TABLE 22 THREE & HALF CORE ALUMINIUM CONDUCTOR ARMOURED CABLES.
TABLE 23 FOUR CORE ALUMINIUM CONDUCTOR ARMOURED CABLES.
8. RATING FACTORS.
9. OVERLOAD & SHORT CIRCUIT CAPACITY
10. FORMULA FOR CALCULATING VOLTAGE DROP.
11. RECOMMENDATION FOR INSTALLATION.
12. RECOMMENDED "PAGODA" CABLE FOR MO TORS.
13. CURRENT FOR AC MOTORS.
14. CONVERSION TABLE.
15. GLOSSARY OF TERMS
1.
ABOUT PAGODA.
Pagoda Cables Pvt. Ltd. is one of the renowned manufacturers of cables in
the Cable Industry in India. Our range encompasses a large variety of wires &
cables including Flexible Cables, Control & Power Cables (Unarmoured &
Armoured), Telephone Cables (Unarmoured & Armoured), Submersible
Cables, Data Flow Cables, Instrumentation Cables, Coaxial Cables,
Compensating cables and FRLS cables.
Our Quality Assurance department performs regular checks on quality of
cables online & offline to deliver high quality of cables. Pagoda Cables has
established a favorable image in the eyes of people for reliability and
commitment.
2.
OUR PRODUCT RANGE
SELECTION OF CABLE
*Single Core Unarmoured/Armoured Cables upto 630 Sq.mm conforming to IS:1554 [Pt-I]:88.
*Two Core, Three Core, Three & Half Core and Four Core Unarmoured/Armoured Power Cables
upto 400 Sq.mm. conforming toIS:1554[Pt-I]:88.
*Multicore Unarmoured/Armoured Control Cables upto 61 cores in 1.5
conforming to IS: 1554 [PT-I] : 88.
* FRLS PVC / FRHF Compound Sheathed Unarmoured/Armoured Cables
The following points should be taken into consideration before selecting any
[1] The System of Power & Voltage Source where the cable are being used.
[2] Conditions of Installation at site.
[3] Current Carrying Capacity of the cable.
[4] Voltage Drop of the cable.
[5] Short Circuit Capacity of the cable.
Sq.mm. & 2.5 Sq.mm.
particular size and
type of cable.
3.
QUALITY ASSURANCE PLAN.
We have a vigorous Quality Manual Plan comprising testing of incoming material , in line checks
during production and final testing. The quality manual program is regularly reviewed to upgrade it.
Our laboratory is equipped with all the instruments to ensure that the various tests required under different
specification are conducted before cables are cleared for despatch. Each consignment of cables
is despatched to the customer with test report results of tests conducted in our laboratory. The details of
tests conducted on raw material, in process and on final stage are given below:-
Raw materials are procured from approved vendors. Testing on raw material starts from vendor's end. The
raw material are received along with the vendor's test report. The following tests conducted to test the raw
material/verify the vendor's test report.
TEST ON RAW MATERIALS
1.Conductor:-
2. P.V.C. Compound.
Tests are conducted on conductor as per IS:8130:1984. Apart from these tests, if customers requires any other
additional test. Those tests are also conducted.
i) Conductor Resistance : 100% with the help of Kelvin Double Bridge for wire up to
0.4mm. diameter. Finer wires by sampling of 10% on lot basis.
ii) Conductor Elongation : 100% on Tensile Testing machine for wires upto 0.4mm Diameter.
Finer wires by sampling of 10% on lot basis.
iii) Solder Bath/Persulphate : 100% for wires up to 0.4mm. Diameter Finer wires by sampling of
For Tinned conductors only) 10% on lot basis
iv) Wrapping Test : 100% Wrapping is done manually.
(For Aluminium Conductor Only)
v) Tensile Strength : 100% on Tensile Testing Machine.
(For Aluminium Conductor Only)
Tests are conducted on PVC Compound are as per IS:5831:1984. Apart from these tests, if customers requires any
other additional tests. Those tests are also conducted.
Sample of every consignment is first run on trial basis and following tests are conducted: -
( .
4.
i) Insulation Resistance : With Mega Ohms Meter.
ii) Elongation : With Tensile Testing Machine.
iii) Tensile Strength : With Tensile Testing Machine.
iv) Spark Testing : With on line Spark Testers.
v) High Voltage Test : With High Voltage Tester.
vi) Thermal Stability Test : With Oven & PH Paper.
vii) Oxygen & Temperature Index : With Oxygen Test Appartus Specification - ASTM -D 2863.
[For FRLS PVC / FRHF Compound]
viii) Smoke Density Test : With Smoke Density Test Appartus Specification -ASTM - D
ix) HCL Gas Generation Test : With HCL Gas Emission Test Appartus Specification IEC-754-1.
[For FRLS PVC Compound]
i) Bleeding & Blooming : With Bleeding & Blooming tape and HST Oven.
ii) Ageing : With Ageing Oven.
iii) Hot Deformation : With Hot Deformation Apparatus.
iv) Loss of Mass : With Electronic Balance & Additional Ageing Oven with
Air Flow.
We procure ISI marked G.I. wire & Strips conforming to IS:3975. However, the following Tests are conducted
TYPE TESTS :-
3. STEEL STRIP/WIRE:-
2843
[For FRLS PVC / FRHF Compound].
/ FRHF
5.
i) Dimension : 100% with Micrometer and Vernier Callipers.
ii) Tensile Strength : 100% with Tensile Testing Machine.
iii) Dip Test : with Dip Tester.
IN PROCESS TESTING
PROCESS TESTSa) CONDUCTOR STRANDING 1. Dimension of Conductor.
2. Lay Length & Direction of Lay.
3. Surface and Shape of Conductor
4. D.C. Resistance.
b) INSULATION 1. Dimension of Core.
[PVC EXTRUSION] 2. Insulation Thickness.
3. Eccentricity of Insulation Wall.
4. Spark Test.
c) LAYING OF CORES. 1. Sequence of Cores.
2. Lay Length & Direction of Lay.
3. Laid Up Diameter.
4. Circularity of Cable.
5. High Voltage Test.
6. Conductor Resistance Test.
d) INNER SHEATH 1. Surface.
[PVC EXTRUSION] 2. Concentricity.
3. Thickness.
4. Diameter Over Inner Sheath.
5. High Voltage Test.
6. Conductor Resistance Test.
e) ARMOURING 1. Number & Size of Wire/Strip.
2. Lay Length & Direction of Lay.
3. Dia. Over Armouring.
4. Uniformity & Circularity of Cable.
5. High Voltage Test.
6. Conductor Resistance Test.
f) OUTER SHEATH 1. Surface.
[PVC EXTRUSION] 2. Concentricity.
3. Thickness.
4. Overall Diameter.
5 Embossing with requisite Information on outer sheath.
6.
All the cables drums leaving "Pagoda" works undergo the following tests at final stage of manufacturer:
i) Conductor Resistance Test
ii) High Voltage Test.
iii) Armour Resistance Test (For Mining Cable)
i) Conductor Resistance Test
ii) Annealing Test [For Copper]
iii) Tensile strength Test [For Aluminium]
iv) Wrapping Test [For Aluminium]
v) Thickness of Insulation, Inner sheath & Outer Sheath.
vi) Tensile Strength & Elongation Test of Insulation & Outer Sheath.
vii) Insulation Resistance Test.
viii) High Voltage Test at Room Temperature Test.
ix) Oxygen & Temperature Index test [For FRLS PVC / FRHF Compound Insulation & Sheath.]
x) Smoke Density Test[For FRLS PVC
xi) HCL Gas Generation Test[For FRLS PVC
i) Conductor Resistance Test
ii) Annealing Test [For Copper]
iii) Tensile strength Test [For Aluminium]
iv) Wrapping Test [For Aluminium]
v) Thickness of Insulation, Inner sheath & Outer Sheath.
vi) Tensile Strength & Elongation Test of Insulation & Outer Sheath.
vii) Ageing in air Oven of Insulation & Outer Sheath.
viii) Shrinkage Test of Insulation & Outer Sheath.
ix) Thermal Stability Test of Insulation & Outer Sheath.
x) Hot Deformation Test of Insulation & Outer Sheath.
xi) Heat shock Test of Insulation & Outer Sheath.
xii) Loss of Mass Test of Insulation & Outer Sheath.
xiii) Oxygen & Temperature Index [For FRLS PVC
xiv) Smoke Density Test[For FRLS PVC
xv) HCL Gas Generation Test[For FRLS PVC
xvi) Test for Armouring Wires/strips.
xvii) Insulation Resistance Test.
xviii) High Voltage Test [Water Immersion & at Room temperature]
xix) Flammability Test.
i) Cold Bend Test.
ii) Cold Impact Test.
Iii) Armour Resistance Test [for other than Mining Cable]
ROUTINE TESTS
ACCEPTANCE TESTS
TYPE TESTS
OPTIONAL TESTS
/ FRHF Compound Insulation & Sheath.]
/ FRHF Compound Insulation & Sheath.]
/ FRHF Compound Insulation & Sheath.]
/ FRHF Compound Insulation & Sheath.]
/ FRHF Compound Insulation & Sheath.]
7.
Cable Design & Construction
IS:1554(Pt-I) : 88
Conductor:
Insulation:
Armoured and Unarmoured Single Core, Twin Core, Three Core and Multicore Copper orAluminium conductor PVC Insulated & Sheathed cables for Electric supply and control purposesfor use on AC voltage upto & including 1100 V or DC upto & including 1500 V to earth.
The most acceptable metals for conductors are Copper or Aluminium due to their high conductivityand ductility. Therefore, Conductor material normally employed in PVC Cables are O, H2, or H4 ECgrade Aluminium or high conductivity annealed copper or annealed tinned copper conforming inall respect to IS: 8130:84.
As Copper gets higher affinity with Sulphur, it corrodes in the atmostphere where Sulphur fumes arepresent. In these conditions, tinned copper shall be used. Power Cables are mostly manufacturedwith Aluminium .Use of Copper has been restricted to Control Cables, Signalling Cables andMining Cables as per Govt. Directives.
The most economic construction for conductor is solid conductor. As area of conductor increases,solid conductor becomes more stiff and hence difficult to handle. In this connection StrandedConstruction is adopted i.e.made of number of strands, arranged in spiral layers in1+6+12+18+24......formations.
Shaping of conductor is necessary in making Multicore Cables sizes above 10.0 Sq.mm. Inaluminium & 6.0 mm in copper conductor to obtain compact and economic design. Here,Stranded Conductors are shaped into a segment of a circle so that when all cores are laid , theyform a complete circle.
The PVC covering over conductor is called "INSULATION". It is a specially formulated best quality,high grade of Poly Vinyl Chloride conforming to IS 5831:84 and is applied by Extrusion processonly. It is resistant to moisure, oils, alkalies, good dielectric and having high Insulation Resistancevalues, Fire Retarding, Permanent Colours .
S.No. Properties Values
1. Specific Gravity 1.3 - 1.45
2. Tensile Strength(N/mm ) 16.0to18.5
Properties of General Purpose PVC Compound:
2
8.
3. CompressionStrength 0.75-1.254. Elongation % 220-3005. HardnessRockwell(ShoreA) 50-100
6. ThermalConductivity10 3-4
Cal/Sec/Sq.Cm./1( C/Cm.)
7. SpecificHeat,Cal/ C/gm. 0.3-0.5
8. ThermalResistitvity, C.Cm./W 600-6509. DielectricConstant,50-60Cycle 5-610. DielectricStrengthKV/mm. 20-40
11. VolumeResistivity10 Ohm-Cm. 10-100012. DissipationFactor,50-60Cycle 0.10-0.15
___________________________________________________________________________
PVCCompoundismadeofPVCresin,blendedwithPlastisizers,Stablizers, fillers,Lubricants,Antioxidantandcertain special purpose additives to improve processability Electrical, Mechanical, Thermal andChemical Propertiesandalsootherspecial requirements.
We also provide Heat Resistance (H.R.) PVC Compound Flame Retardent low smoke (FRLS) PVCCompound & Flame Retardent Halogen Free (FRHF) Compund insulation on special requirement.
TheInsulatedcoresareidentifiedwithacolourscheme as per IS:1554[Pt-I]-1988as follows:
NoOfCores CoreColour
1 Red,Black,Yellow Blue or natural (non-pigmented)2 Red&Black3 Red,Yellow&Blue.4 Red,Yellow,Blue&Black.5 Red,Yellow,Blue,Black&Grey.
In case of cable exceeding five cores, two adjacent [Counting and direction core] in each layer shall becolored Blue, Yellow and remaining cores grey or Cores can also be identified by numbers printed onthat of same colour.
Incaseoffourcorescableswithreducedneutralconductor[Usually termedas3 CoreCable] threemain
coresarecolouredRed,YellowandBlueandthereducedneutralcoreshallbeblack.
4
0
0
0
12
IdentificationofCores:
½
LayingupofCores:
Thecoresarelaidupwithasuitablelay.Thefinal layerhasalwaysarighthandlay.
9.
InnerSheath:
Armouring:
Outer Sheath :
Innersheath isprovidedover laidupofcores. It isprovidedtogiveCircularShapeof thecableanditprovidesbeddingfor the armouring.
IS:1554(Pt-I) - 88 permits following two methods of applying the Inner Sheath of thermoplastic material i.e.PVC,Polyethyleneetc., Whichisnotharder than insulation.
a) Here the innersheath is provided by extrusion of thermoplastic
overthelaidupofcores
(b) Here theinnersheathis provided by wrapping at hermoplastic tape.
Armouringmaterial isconformingtoIS:3975. In order to protect thecable against MechanicalDamages,armouring of steel wire/strip is provided. It provides mechanical protection to inside of cores and it carries earthReturnCurrent incaseofshortcircuitofacorewitharmour.Asper IS:1554(Pt-I) -88, RoundWirearmouringisprovidedincablewherecalculateddiameterunderarmourisupto13mm.Abovethisthearmouriseithersteelwireorsteelstripof size 4.00X0.80 mm. As strip construction is economical, the manufacture always provides steel strip armouringunlesswirearmouringisspecified.
In long runofcableand incaseofMines, the roundwirearmour ismustas stripconstructionprovides,higherresistance to Earthfault Current and some times this current may not be sufficient to operate the circuit breaker incaseofearthfault.
In case of cables for use in mines, theresistanceofarmour shall not exceed that of the conductor of mainby more than 33 percent for safety reasons. To achieve this, sometimes tinned hard drawn copper is used alongwith the galvanised steel Wires/Strips.Sometimes two layers of steel wires are provided to give extra protection.
In case of Single core armoured cables used in A.C. System, the material has to be non magnetic forarmouring as in this case of return current is not passing through the same cable. Hence it will not cancel themagneticlines producedbycurrent.Thesemagneticlines whichareoscillatingincaseofA.C.systemswillgiverisetoeddy currents in magnetic armouring and hence armouring will become hot, and this may lead to failure of thecable. Generally hard drawn aluminium wires/ strips are used for armouring in this case . In D.C. System, Steelwires/strips armouringisused.
In order to protect the cable frommoisureandotherchemicalerosions,a finalcoveringofPVCcompoundisappliedoverarmouring incaseofarmouredcableandover inner sheath incaseofunarmouredcable called as"Outer Sheath". Sometimes this outer sheath is required to be special compound to resist from termites, acids,fungis,rodentetc.,weprovidethesame.
IS:1554(Pt-I)-88specifiesnominalthickness and minimum thickness ofoutersheath for Unarmoured cablesand minimum thickness ofoutersheath for Armoured Cables.
It permits the following types of PVCcompound for sheathing.
[i] Outer Sheath with type ST1 PVC Compound as per IS:5831-84 which is suitable for 70 C continuousoperation.
[ii] Outer Sheath with type ST2 PVC Compound as per IS:5831-84 which is suitable for 85 C continuousoperation.
0
ExtrudedInnersheath :
TappedInnersheath :
0
10.
Instead of above two, we also provide flame Retardent Low Smoke (FRLS) PVC compound
sheathed cable on special requirement.
PVC Cables aredesigned as per the requirement of relevant IS specification. Following is thescheme ofnomenclature.A - Aluminium Conductor when first letter of typedesignation. When type designation does not
begin with A the cablehas copperconductor.Y - When at first or second place in typedesignation, it stands for PVCW - Round Steel Wire Armouring.
WW - Steel Double Round Wire Armouring.FF - Steel FlatDouble StripArmouring.
CodesforCableDesignation:
- Flat Steel StripArmouring.
PAGODAFLAMERETARDANTLOWSMOKECABLES
&Flame Retardent Halogen Free (FRHF) Compound
F
YWY means CopperConductor, PVC insulated, Round Wire Armoured and PVC SheathedCable.
AYFYmeansAluminiumConductor, PVCInsulated,SteelStripArmouredandPVCOuterSheathed.
TYPICAL EXAMPLES OF DESIGN & CONSTRUCTION
AS PER IS:1554
IS Specification
8130
5831
5831
3975
5831
Conductor :
Insulation :
Inner Sheath :
Armour :
Outer Sheath :
EC grade
Aluminium
PVC type
A or C
PVC type
ST1 nor ST2
Galvanised
Steel strip
PVC type
ST1 or St2
Conductor :
Insulation :
Inner Sheath :
Armour :
Outer Sheath :
High conductivity
Grade copper
PVC type
A or C
PVC type
ST1 nor ST2
Galvanised
Steel strip
PVC type
ST1 or ST2
Power CableSteel Strip, armoured
Control CableSteel Strip, armoured
CLASSIFICATION OF PVC COMPOUNDType Application Max.Conductor
A Insulation 70 C
C Insulation 85 C
ST1 Sheath 70 C
ST2 Sheath 85 C
0
0
0
0
11.
InmodernPower,Chemical,Fertilizers,CementsPlantsetc.andPublicPlacessuchas Hospitals,RailwayStation,HighRise
CommercialComplexes, Theatres,Airportsetc.manyPVCcablesarebunchedinacableshaftoronacabletrays. Incaseoffirein
thesecables, thefirebecomesselfsustaining.MoreverduetoburningofPVC,adensecorrosivesmokeisemittedwhichmakesfire
fighting very difficult, due to poor visibility and toxic nature of gas. HCL contents of the smoke, not only damages other costly
equipmentlyingnearby,butalsopenetratestheRCCandcorrodesthesteelreinforcement.Duetothis, thereisextensivedamage
totheproperty.Therefore,phenomenonoffirehasalwaysbeenamatterofseriousconcernandbehaviourofcableunderthefire.
The phenomenon of fire has always been a matter of serious concern and the performance of electric cables in fire
situation is becoming increasingly important, because every year innumberable persons die in fire and causing disasters to
human life and property. Investigations have proved that under fire situations PVC emits large quantities of smoke and corrosive
fumesmakingvirtually impossibleforfirefightingandrescueoperations.
FRLScablesincorporatesthefollowingfeatures:
1. No fire propogation.
2. Flame Retardancy.
3. LowAcidEmission-Normalcablessmokewhencombineswithairmoistureproduces largeamountofhighlycorrosive
acids imposing threat to life and property while FRLS cables produces less smoke reducing the threat to life and
property.
4. Lowsmokeemission.
To overcome these problems, "PAGODA" has also successfully developed, tested and manufactured new generation
FRLS[FlameRetardentLowSmoke]Cables.ThesecableswithspecialPVCformulationmaterialprevents thepropagationofflame
along the length when exposed to fire. In addition, these cables emit low smoke and halogen emission is also reduced under fire
conditions. These properties help immense fire fighting operation and prevention of further loss to costly equipment to which
cablesareconnected.
i) Increasedresistancetoignitionrelativeofhigheroxygenindexandtemperatureindex.
ii) Volumeofsmokeandcorrosivefumesisminimisedbecauseofspecialcompositionofprotectiveinsulationmaterial,having
lowestrateofdecompositionandthuspreventsdamagetoproperty.
iii) Duetoemissionof less smoke, lowacidemissionand lowtoxicgasemission,damagetopropertyand lossof life isminimised
makingfirefightingeasy.
SPECIFICATION TEST AIM TYPICALVALUES
FRLS CABLES
ASTM-D 2863 ygen To determine at room temp, the %
Index of oxygen needed to burn More than 29 %
the insulating material
ASTM-D 2863 Temperature To determine temp. At which 21%
&BICC Index Oxygen in the air will burn
Handbook the insulating material. More than 250 C
Chp. No. 6
ASTM-D 2843 Smoke To determine the visibility in case More than 40%
Density the Insulating Material ever
catches fire. (Transmission of Light)
IEC 754-1 Acid Gas To determine the amount of Less than 20%
Generation Hydro Chloric, Hydro-Flouric and
Halogen Acid Gases produced from
burning of Insulating Material.
0
FRLS PVC SHEATHEDCABLES
Advantagesof"PAGODAFRLS PVC SHEATHED CABLES" CABLES UnderFireConditions:
Ox
Index
12.
TABLE - 1
COMPOSITION & MAX RESISTANCE OF CONDUCTOR, CLASS I (SOLID)& CLASS 2 (STRANDED) FOR SINGLE CORE & MULTICORE CABLES.
AS PER IS - 8130/1984
Class 2 (Stranded)
Circular ConductorNon-Compacted
Sq. mm.
1.5
2.5
4
6
10
16
25
35
50
70
95
120
150
185
240
300
400
500
630
Cu/AI
1
1
1
1
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
Cu
3
3
7
7
7
7
7
7
19
19
19
37
37
37
61
61
61
61
91
Cu
---
---
---
---
6
6
6
6
6
12
15
18
18
30
34
34
53
53
53
AI
---
---
---
6
6
6
6
6
12
15
18
18
30
34
34
53
53
53
---
Plain wires
12.1
7.41
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
0.0470
0.0366
0.0283
Tinned wires
12.2
7.56
4.70
3.11
1.84
1.16
0.734
0.529
0.391
0.270
0.195
0.154
0.126
0.100
0.0762
0.0607
0.0475
0.0369
0.0286
18.1
12.1
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
0.0605
0.0469
AI
3
3
7
7
7
7
7
7
19
19
19
37
37
37
61
61
61
61
91
Circular Compactedor shaped
Copper Conductor AluminiumConductor
MINIMUM NO. OF WIRES IN THE CONDUCTORMax. D.C. Resistance at 20 C
Ohms/Km.
0
13
APPROXIMATE REACTANCE AT 50 HZ. (Ohm/Km.) 1.1 KV PVC & HR PVC CABLES
REACTANCE
NOMINAL AREA
OF
CONDUCTOR
(SQ. MM.)
SINGLE CORE MULTI CORE
UNARMOURED
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.167
0.156
0.147
0.137
0.126
0.116
0.111
0.105
0.0984
0.0934
0.0914
0.0878
0.0866
0.0852
0.0834
0.0830
0.0815
----------
----------
0.163
0.152
0.139
0.130
0.122
0.116
0.108
0.105
0.100
0.0962
0.0945
0.0924
0.0908
0.0902
0.0879
0.109
0.105
0.101
0.0949
0.0890
0.0859
0.0842
0.0824
0.0794
0.0764
0.0761
0.0738
0.0738
0.0737
0.0732
0.0729
0.0725
ARMOURED
TABLE - 2
14
APPROXIMATE CAPACITANCE (MICRO FARADS/KM.) 1.1 KV PVC & HR PVC CABLES.
NOMINAL AREA
OF
CONDUCTOR
(SQ. MM.)
SINGLE CORE TWO CORETHREE & HALF
& FOUR COREUNARMOURED
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.43
0.52
0.57
0.67
0.83
0.97
1.00
1.15
1.26
1.32
1.36
1.49
1.52
1.53
1.54
1.60
1.70
----------
----------
----------
----------
----------
----------
0.83
0.95.
0.95
1.12
1.17
1.28
1.32
1.30
1.37
1.40
1.50
0.35
0.41
0.46
0.52
0.63
0.82
0.86
0.98
1.00
1.16
1.18
1.31
1.28
1.30
1.34
1.37
1.43
0.12
0.13
0.14
0.16
0.18
0.19
0.22
0.24
0.24
0.26
0.26
0.28
0.28
0.28
0.28
0.29
0.29
ARMOURED
TABLE - 3
CAPACITANCE
15
TYPE - 1.5 SQ.MM. MULTI CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, ARMOURED/UNARMOURED & OVERALL PVC SHEATHED
CABLE CODE - YY/YWY/YFY
Nominal
Thickness
of
Insulation
mm
Min.
Thickness
of
Inner
Sheath
mm
ARMOUR Nominal
Sheath
Thickness
for
Unarm-
oured
mm
Minimum
Sheath
Thickness
for
Armoured
mm
Galvanised
Round
Steel
Wire
Nominal
Diameter
mm
Galvanised
Flat
Steel
Strip
Nominal
Thickness
mm
Approx. Over
All Diameter
Unarmoured
mm
Unarm
oured
Kg/Km
Armoured
mm
Armou
red
Kg/Km
Direct
in
ground
Amps.
In
Ducts
Amps.
Approx. Weight
of CablesMax.
DC
Conductor
Resistance
at
20 C
Ohm/Km
0
Current Ratings
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.2
1.24
1.24
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.40
1.40
1.40
1.40
1.56
10.4
10.9
11.7
12.6
13.4
13.4
16.5
17.0
17.7
19.0
19.9
23.0
24.2
26.0
32.7
12.0
12.7
13.3
14.2
15.0
15.0
18.2
17.3
18.3
19.1
20.0
23.0
24.3
26.6
33.0
170
195
225
275
325
345
460
520
580
680
780
950
1150
1350
2100
390
430
480
560
625
645
810
815
885
980
1100
1300
1540
1800
2670
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
23
21
21
21
15
14
13
12
11
11
10
9
9
8
7
Number
of
cores
No.
In
Air
Amps.
2
3
4
5
6
7
10
12
14
16
19
24
30
37
61
20
17
17
17
13
13
11
10
10
9
9
8
7
7
6
20
17
17
17
13
13
11
10
10
9
9
8
7
7
6
TABLE - 4
PART - I
IS: 1554
16
TABLE - 5
TYPE - 2.5 sq.mm. MULTI CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, ARMOURED/UNARMOURED & OVERALL PVC SHEATHED
CABLE CODE - YY/YWY/YFY
Number
oif
cores
No.
Nominal
Thickness
of
Insulation
mm
Min.
Thickness
of
Inner
Sheath
mm
ARMOUR Nominal
Sheath
Thickness
for
Unarm-
oured
cables
mm
Minimum
sheath
Thickness
for
Armoured
mm
cables
Galvanised
Round
Steel
Wire
Nominal
Diameter
mm
Galvanised
Flat
Steel
Strip
Nominal
mm
thickness
Approx. Over
All Diameter
Unarm
oured
mm
Unarm
oured
Kg/Km
Armou
red
mm
Armou
red
Kg/Km
Direct
in
ground
Amps.
In
Ducts
Amps.
In
Air
Amps.
Approx. Weight
of CablesMax.
DC
Condu-
ctor
Resistance
at 20 C
Ohm/Km
�
Current Ratings
2
3
4
5
6
7
10
12
14
16
19
24
30
37
61
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.2
2.2
1.24
1.24
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.40
1.40
1.56
1.56
1.56
11.6
12.2
13.1
14.2
15.2
15.2
19.3
19.8
20.8
21.9
22.9
26.6
28.1
30.8
38.1
13.2
13.8
14.7
15.8
16.8
16.8
19.4
20.0
20.9
21.9
23.0
26.6
28.6
30.8
38.0
210
254
305
356
415
445
615
710
790
900
1025
1275
1520
1850
2910
460
515
590
665
740
755
940
1014
1130
1240
1380
1730
2000
2350
3600
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
7.41
32
27
27
27
20
20
18
17
16
15
14
13
12
11
9
27
24
24
24
18
17
15
14
13
13
12
11
10
10
8
27
24
24
24
18
17
15
14
13
13
12
11
10
10
8
PART - I
IS: 1554
17
TABLE - 6
TYPE - SINGLE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION & OVERALL PVC SHEATHED
CABLE CODE - YY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of
Cables
Kg/Km
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
�Direct in ground
2 Cables
Amps.
3 Cables
Amps.
2 Cables
Amps.
3 Cables
Amps.
2 Cables
Amps.
3 Cables
Amps.
In Duct In Air
Current Ratings
1.5*
2.5*
4.0*
6.0*
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
500.0
630.0
800.0
1000.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
3.0
3.4
3.4
3.4
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.0
2.0
2.2
2.2
2.4
2.4
2.4
2.8
6.70
7.40
8.00
8.50
9.30
10.80
12.50
13.70
15.80
17.80
19.70
21.80
23.40
25.50
28.60
32.00
36.50
40.20
43.50
50.00
55.00
55
80
100
130
170
240
260
440
610
840
1090
1300
1600
2000
2550
3200
4200
5250
6400
8200
10200
12.10
7.41
4.61
3.08
1.83
1.15
0.727
0.525
0.384
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
0.0470
0.0366
0.0283
0.0221
0.0176
22
35
46
57
75
94
125
150
180
220
265
300
340
380
420
465
500
540
590
668
733
22
30
39
49
65
85
110
130
155
190
220
250
280
305
345
375
400
425
470
533
585
23
31
42
54
72
92
120
140
165
200
230
255
280
305
340
370
405
430
465
527
579
21
29
38
48
64
83
110
125
150
175
200
220
245
260
285
310
335
355
375
425
467
24
32
43
54
72
92
125
155
190
235
275
310
345
390
445
500
570
610
680
832
879
20
27
35
44
60
82
110
130
165
205
245
280
320
370
425
475
550
590
660
808
853
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
18
TABLE - 7
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED & OVERALL PVC SHEATHED
CABLE CODE - YY
* If required, Cables can be made with stranded conductor also.
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
PART - I
IS: 1554
NominalCross
SectionalArea
Sq. mm
4*
6*
10
16
25
35
50
70
95
120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.5
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.0
2.2
2.2
2.2
2.2
2.4
2.6
13.0
14.5
15.6
16.5
19.4
21.0
23.7
26.3
30.4
32.8
35.8
39.3
44.5
49.1
297
375
475
562
790
1033
1370
1766
2375
2985
3470
4328
5465
6786
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
41
50
70
90
115
140
165
205
245
285
320
360
425
480
35
45
58
75
97
120
145
180
215
235
270
300
345
385
35
45
60
78
105
125
155
195
230
265
305
350
410
465
NominalThickness
ofInsulation
mm
MinimumThicknessof InnerSheath
mm
NominalThicknessof OuterSheath
mm
Approx.Overall
Diameter
mm
Approx.Weight
ofCables
Kg/Km
Max DCConductorResistance
At 20 C
Ohm/Km
� Direct inGround
Amps.
In Duct
Amps.
In Air
Amps.
Current Ratings
19
TABLE - 8
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED & OVERALL PVC SHEATHED
CABLE CODE - YY
* If required, Cables can be made with stranded conductor also.
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
PART - I
IS: 1554
NominalCross
SectionalArea
Sq. mm
4*
6*
10
16
25
35
50
70
95
120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.6
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.2
2.2
2.2
2.4
2.4
2.8
3.0
13.7
14.8
16.5
17.8
21.2
21.3
26.1
29.7
33.7
36.7
40.6
44.9
51.0
56.5
393
510
620
735
1095
1355
1850
2500
3400
4200
5200
6200
8000
9900
4.61
3.08
1.83
1.15
0.727
0.524
0.384
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
36
45
60
77
99
120
145
175
210
240
270
300
345
385
30
38
50
64
81
99
125
150
175
195
225
255
295
335
30
39
52
60
90
110
135
165
200
230
265
305
355
400
NominalThickness
ofInsulation
mm
MinimumThicknessof InnerSheath
mm
NominalThicknessof OuterSheath
mm
Approx.Overall
Diameter
mm
Approx.Weight
ofCables
Kg/Km
Max DCConductorResistance
At 20 C
Ohm/Km
� Direct inGround
Amps.
In Duct
Amps.
In Air
Amps.
Current Ratings
20
TABLE - 9
TYPE - THREE & HALF CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION : COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
OVERALL PVC SHEATHED CABLE CODE - YY
Nominal Cross
Sectional Area
Main Neutral
Sq. mm. Sq. mm
Nominal
Thickness
Minimum
Thickness
of Inner
Sheath
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx
Overall
Diameter
mm
Approx
Weight
of Cables
Kg/Km
Main
Ohm/km
Neutral
Ohm/km
Direct in
Ground
Amps
In
Ducts
Amps
In
Air
Amps
of Insulation
Main Neurtral
mm mm
25
35
50
70
95
120
150
185
240
300
16
16
25
35
50
70
70
95
120
150
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
1.0
1.0
1.2
1.2
1.4
1.4
1.4
1.6
1.6
1.8
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.5
0.6
0.6
2.00
2.00
2.20
2.20
2.20
2.40
2.40
2.60
3.00
3.20
23.90
26.20
29.50
33.50
37.50
41.20
43.80
47.70
56.60
62.50
1313
1600
2230
3020
3975
4960
6020
7420
9440
11670
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
1.150
1.150
0.727
0.524
0.387
0.268
0.268
0.193
0.153
0.124
99
120
145
175
210
240
270
300
345
385
81
99
125
150
175
195
225
255
295
335
90
110
135
165
200
230
265
305
355
400
PART - I
IS: 1554
Max. DC Conductor
Resistance at 20 C0 Current Ratings
21
TABLE - 10
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED OVERALL PVC SHEATHED
CABLE CODE - YY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Direct
in ground
Amps.
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0In
Duct
Amps.
Current Ratings
In
Air
Amps.
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
4*
6*
10
16
25
35
50
70
95
120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.5
0.5
0.6
0.6
0.7
1.8
1.8
1.8
2.0
2.0
2.0
2.2
2.2
2.2
2.4
2.6
2.8
3.0
3.2
14.8
16.0
17.9
20.3
23.9
26.0
30.1
33.9
38.6
42.5
47.0
52.2
58.9
65.3
368
488
707
945
1418
1850
2540
3430
4450
5570
6910
7612
10840
13425
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0470
36
45
60
77
99
120
145
175
210
240
270
300
345
385
30
38
50
64
81
99
125
150
175
195
225
255
295
335
30
39
52
66
90
110
135
165
200
230
265
305
355
400
22
TABLE - 11
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED
GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED.
CABLE CODE - YWY/YFY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Minimum
Thickness
of Outer
Sheath
mm
Galvanised
Round
Steel Wire
Nominal
Diameter
mm
Galvanised
at
Steel Strip
Nominal
Thickness
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Direct
in ground
Amps.
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0In
Duct
Amps.
Current RatingsARMOUR
In
Air
Amps.
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
4*
6*
10
16
25
35
50
70
95
120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.5
1.40
1.40
1.40
1.40
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-----
-----
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.40
1.56
1.56
1.56
1.72
1.88
14.50
15.60
17.10
16.50
17.80
19.30
22.00
24.00
27.00
29.00
32.40
35.60
39.60
43.70
585
655
824
918
1070
1333
1660
2121
2770
3320
3996
4930
6170
7562
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
41
50
70
90
115
140
165
205
240
275
310
350
405
450
35
44
58
75
97
120
145
180
215
235
270
300
345
385
35
45
60
78
105
125
155
195
230
265
305
350
410
465
23
TABLE - 12
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED
GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED.
CABLE CODE - YWY/YFY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Minimum
Thickness
of Outer
Sheath
mm
Galvanised
Round
Steel Wire
Nominal
Diameter
mm
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Direct
in ground
Amps.
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0In
Duct
Amps.
Current RatingsARMOUR
In
Air
Amps.
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
4*
6*
10
16
25
35
50
70
95
120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.5
0.5
0.6
0.6
0.6
1.40
1.40
1.40
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
1.24
1.24
1.40
1.40
1.40
1.40
1.40
1.56
1.56
1.56
1.72
1.72
1.88
2.04
15.2
16.4
18.2
17.8
20.8
22.8
26.0
29.2
33.2
35.7
39.6
43.5
48.7
54.0
660
740
970
1080
1390
1700
2250
3000
3900
4700
5700
6900
8700
10700
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
36
45
60
77
99
120
145
175
210
240
270
300
345
385
30
38
50
64
81
99
125
150
175
195
225
255
295
335
30
39
52
66
90
110
135
165
200
230
265
305
355
400
24
TABLE - 13
TYPE - THREE & HALF CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
GI STRIP ARMOURED & OVERALL PVC SHEATHED CABLE CODE - YFY
Nominal Cross
Sectional Area
Main Neutral
Sq. mm. Sq. mm
Minimum
Thickness
of Inner
Sheath
mm
Minimum
Thickness
of Outer
Sheath
mm
Approx
Overall
Diameter
mm
Approx
Weight
of Cables
kg/km
Main
Ohm/km
Neutral
Ohm/km
Direct in
Ground
Amps
In
Ducts
Amps
In
Air
Amps
Nominal
Thickness
of Insulation
Main Neutral
mm mm
25
35
50
70
95
120
150
185
240
300
16
16
25
35
50
70
70
95
120
150
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
1.0
1.0
1.2
1.2
1.4
1.4
1.4
1.6
1.6
1.8
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.5
0.6
0.6
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.4
1.4
1.56
1.56
1.56
1.72
1.88
2.04
2.20
2.36
23.0
25.3
29.5
32.8
37.2
40.5
45.0
49.5
55.6
61.5
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0601
1610
1970
2680
3520
4425
5540
6570
8020
10200
12500
1.150
1.150
0.727
0.524
0.387
0.268
0.268
0.193
0.153
0.124
99
120
145
175
210
240
270
300
345
385
81
99
125
150
175
195
225
255
295
335
90
110
135
165
200
230
265
305
355
400
PART - I
IS: 1554
Max. DC Conductor
Resistance at 20 C0ARMOUR Current Ratings
Galv.
Flat
Steel Strip
Nominal
Thickness
mm
25
TABLE - 14
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED
GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED.
CABLE CODE - YWY/YFY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Minimum
Thickness
of Outer
Sheath
mm
Galvanised
Round
Steel Wire
Nominal
Diameter
mm
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Direct
in ground
Amps.
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0In
Duct
Amps.
Current RatingsARMOUR
In
Air
Amps.
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
4*
6*
10
16
25
35
50
70
95
120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.5
0.5
0.6
0.6
0.7
1.40
1.40
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
1.24
1.24
1.40
1.40
1.40
1.40
1.56
1.56
1.72
1.88
1.88
2.04
2.36
2.52
16.3
17.6
18.4
20.8
24.5
27.0
31.8
35.4
40.0
44.0
48.5
53.9
60.6
2.52
749
878
1050
1275
1748
2350
3040
3930
5050
6240
7363
8122
11424
16680
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.193
0.153
0.124
0.0991
0.0754
0.0470
36
45
60
77
99
120
145
175
210
240
270
300
345
385
30
38
50
64
81
99
125
150
175
195
225
255
295
335
30
39
52
60
90
110
135
165
200
230
265
305
355
400
26
TABLE - 15
TYPE - SINGLE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION & OVERALL PVC SHEATHED
CABLE CODE - AYY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of
Cables
mm
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
Direct in ground
2 Cables
Amps.
Cables
Amps.
2 Cables
Amps.
3 Cables
Amps.
2 Cables
Amps.
3 Cables
Amps.
Direct in Duct Direct in Air
Current Ratings
1.5*
2.5*
4.0*
6.0*
10.0*
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
500.0
630.0
800.0
1000.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
3.0
3.4
3.4
3.4
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.0
2.0
2.2
2.2
2.4
2.4
2.4
2.8
6.70
7.40
8.00
8.50
9.30
10.80
12.50
13.70
15.80
17.80
19.70
21.80
23.40
25.50
28.60
32.00
36.50
40.20
43.50
50.00
55.00
55
65
75
90
105
140
190
225
300
400
500
560
665
855
1070
1345
1710
2150
2564
3270
4060
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
0.0605
0.0469
0.0367
0.0291
21
28
36
44
54
75
97
120
145
170
205
230
265
300
335
370
410
435
485
525
570
17
24
31
39
51
66
86
100
120
140
175
195
220
240
270
295
325
345
390
440
490
19
25
33
42
56
71
93
110
130
155
180
200
220
240
270
295
335
355
395
420
445
17
24
30
37
51
65
84
100
115
135
155
170
190
210
225
245
275
295
320
380
380
18
25
32
41
56
72
99
120
150
185
215
240
270
305
350
395
455
490
560
650
735
15
21
27
35
47
64
84
105
130
155
190
220
250
290
335
380
435
480
550
640
720
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
27
TABLE - 16
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, OVERALL PVC SHEATHED
CABLE CODE - AYY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
Direct
in ground
Amps.
In
Duct
Amps.
Current Ratings
In
Air
Amps.
1.5*
2.5*
4.0*
6.0*
10.0*
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.5
0.5
0.6
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.2
2.2
2.2
2.2
2.4
2.4
2.6
2.8
10.4
11.6
13.0
14.0
15.6
16.5
19.4
21.0
23.7
26.3
30.4
32.8
35.8
39.3
44.5
49.1
54.8
140
200
250
300
350
370
480
600
750
900
1200
1500
1620
2040
2500
3100
3900
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
* If required, Cables can be made with stranded conductor also.
18
25
32
40
55
70
90
110
135
160
190
210
240
275
320
355
385
16
21
27
34
45
58
76
92
115
140
170
190
210
240
275
305
345
16
21
27
35
47
59
78
99
125
150
185
210
240
275
325
365
420
PART - I
IS: 1554
28
TABLE - 17
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, OVERALL PVC SHEATHED
CABLE CODE - AYY
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
Direct
in ground
Amps.
In
Duct
Amps.
Current Ratings
In
Air
Amps.
1.5*
2.5*
4.0*
6.0*
10.0*
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.5
0.5
0.6
0.7
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.2
2.2
2.2
2.4
2.4
2.8
3.0
3.2
10.9
12.2
13.7
14.8
16.5
17.8
21.2
23.1
26.1
29.7
33.7
36.7
40.6
44.9
51.0
56.5
63.1
160
221
320
400
420
440
630
710
900
1200
1650
1950
2400
2750
3500
4350
5500
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
16
21
28
35
46
60
76
92
110
135
165
185
210
235
275
305
335
14
18
23
30
39
50
63
77
95
115
140
155
175
200
235
260
290
13
18
23
30
40
51
70
86
105
130
155
180
205
240
280
315
375
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
29
TABLE - 18
TYPE - THREE & HALF CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
& OVERALL PVC SHEATHED CABLE CODE - AYY PART - I
IS: 1554
Nominal Cross
Sectional Area
Main Neutral
Sq. mm. Sq. mm
Nominal
Thickness
Nominal
Thickness
of Inner
Sheath
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx
Overall
Diameter
mm
Approx
Weight
of Cables
kg/km
Main
Ohm/km
Neutral
Ohm/km
Direct in
Ground
Amps
In
Ducts
Amps
In
Air
Amps
of Insulation
Main Neutral
mm mm
25
35
50
70
95
120
150
185
240
300
400
16
16
25
35
50
70
70
95
120
150
185
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
1.0
1.0
1.2
1.2
1.4
1.4
1.4
1.6
1.6
1.8
2.0
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.5
0.6
0.6
0.7
2.00
2.00
2.20
2.20
2.20
2.40
2.40
2.60
3.00
3.20
3.40
23.90
26.20
29.50
33.50
37.20
41.20
43.80
47.70
56.60
62.50
69.80
750
850
1150
1500
1900
2300
2800
3400
4244
5176
6700
1.200
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
1.91
1.91
1.20
0.868
0.641
0.443
0.443
0.320
0.253
0.206
0.164
76
92
110
135
165
185
210
235
275
305
335
63
77
95
115
140
155
175
200
235
260
290
70
86
105
130
155
180
205
240
280
315
375
Max. DC Conductor
Resistance at 20 C0 Current Ratings
30
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Nominal
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Direct
in ground
Amps.
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0In
Duct
Amps.
Current Ratings
In
Air
Amps.
* If required, Cables can be made with stranded conductor also.
1.5*
2.5*
4*
6*
10*
16
25
35
50
70
95
120
150
185
240
300
400
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.5
0.5
0.6
0.6
0.7
0.7
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.0
2.2
2.2
2.2
2.4
2.6
2.8
3.0
3.2
3.6
11.7
13.1
14.8
16.0
17.9
20.3
23.9
26.0
30.1
33.9
38.6
42.5
47.0
52.2
58.9
65.3
72.9
180
225
269
340
460
550
800
980
1300
1700
2100
2600
3200
3900
4900
6000
8000
16
21
28
35
46
60
76
92
110
135
165
185
210
235
275
305
335
14
18
23
30
39
50
63
77
95
115
140
155
175
200
235
260
290
13
18
23
30
40
51
70
86
105
130
155
180
205
240
280
315
375
TABLE - 19
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
& OVERALL PVC SHEATHED CABLE CODE - AYY PART - I
IS: 1554
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
31
TABLE - 20
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED
CABLE CODE - AYWY/AYFY.
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Galvanised
Rond
Steel Wire
Nominal
Diameter
mm
ARMOUR
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
Minimum
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg/Km
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0
Direct
in ground
Amps.
In
Duct
Amps.
Current Ratings
In
Air
Amps.
1.5*
2.5*
4.0*
6.0*
10.0*
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.4
0.5
0.5
1.4
1.4
1.4
1.4
1.4
1.4
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.24
1.24
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.40
1.56
1.56
1.56
1.72
1.88
2.00
12.00
13.50
14.50
15.60
17.10
16.50
17.80
19.30
22.00
24.00
27.00
29.00
32.40
35.60
39.60
43.70
49.00
400
425
535
580
700
720
760
900
1040
1255
1595
1835
2140
2640
3200
3850
4700
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
18
25
32
40
55
70
90
110
135
160
190
210
240
275
320
355
385
16
21
27
34
45
58
76
92
115
140
170
190
210
240
275
305
345
16
21
27
35
47
59
78
99
125
150
185
210
240
275
325
365
420
* If required, Cables can be made with stranded conductor also.
PART - I
IS: 1554
32
TABLE - 21
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED
CABLE CODE - AYWY/AYFY.
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Galvanised
Rond
Steel Wire
Nominal
Diameter
mm
ARMOUR
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
Minimum
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
Direct
in ground
Amps.
In
Duct
Amps.
Current Ratings
In
Air
Amps.
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.5
0.5
0.6
0.6
1.4
1.4
1.4
1.4
1.4
1.4
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.40
1.56
1.56
1.56
1.72
1.88
1.88
2.04
2.36
12.5
13.5
15.2
16.4
18.2
17..8
20.8
22.8
26.0
29.2
33.2
35.7
39.6
43.5
48.7
54.0
61.0
440
500
580
620
750
780
920
1050
1300
1700
2100
2500
2900
3450
4250
5150
6600
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
16
21
28
35
6
60
76
92
110
135
165
185
210
235
275
305
335
14
18
23
30
39
50
63
77
95
115
140
155
175
200
235
260
290
13
18
23
30
40
51
70
86
105
130
155
180
2105
240
280
315
375
PART - I
IS: 1554
* If required, Cables can be made with stranded conductor also.
33
TABLE - 22
TYPE - THREE & HALF CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI STRIP ARMOURED & OVERALL PVC SHEATHED
CABLE CODE - AYFY.
Nominal Cross
Sectional Area
Main
Sq. mm.
Main
Ohm/Km
Main
Sq. mm.
Neutral
Sq. mm.
Neutral
Ohm./Km
Neutral
Sq. mm.
Nominal Thickness
of Insulation
Minimum
Thickness
of Inner
Sheath
mm
ARMOUR
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
Minimum
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Max. DC Conductor
Resistance AT 20 C� Direct
in ground
Amps.
In
Duct
Amps.
Current Ratings
In
Air
Amps.
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
16
16
25
35
50
70
70
95
120
150
185
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
1.0
1.0
1.2
1.2
1.4
1.4
1.4
1.6
1.6
1.8
2.0
0.3
0.3
0.3
0.4
0.4
0.4
0.5
0.5
0.6
0.6
0.7
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.4
1.4
1.56
1.56
1.56
1.72
1.88
2.04
2.20
2.36
2.52
23.0
25.3
29.5
32.8
37.2
40.5
45.0
49.5
55.6
61.5
69.5
1050
1220
1600
2000
2350
2900
3350
4000
5100
6060
7900
1.200
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
1.91
1.91
1.20
.868
0.641
0.443
0.443
0.320
0.253
0.206
0.164
76
92
100
135
165
185
210
235
275
305
335
63
77
95
115
10
155
175
200
235
260
290
70
86
105
130
155
180
205
240
280
315
375
PART - I
IS: 1554
34
TABLE - 23
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED
CABLE CODE - AYWY/AYFY.
Nominal
Cross
Sectional
Area
Sq. mm
Nominal
Thickness
of
Insulation
mm
Minimum
Thickness
of Inner
Sheath
mm
Galvanised
Rond
Steel Wire
Nominal
Diameter
mm
ARMOUR
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
Minimum
Thickness
of Outer
Sheath
mm
Approx.
Overall
Diameter
mm
Approx.
Weight
of Cables
Kg./Km
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
�
Direct
in ground
Amps.
In Duct
Amps.
Current Ratings
In Air
Amps.
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
0.8
0.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.8
2.0
2.2
2.4
2.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.5
0.5
0.6
0.6
0.7
0.7
1.4
1.4
1.4
1.4
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.56
1.56
1.72
1.88
1.88
2.04
2.36
2.52
2.68
13.3
14.7
16.3
17.6
18.4
20.8
24.5
27.0
31.8
35.4
40.0
44.0
48.5
53.9
60.6
64.0
72.0
478
568
650
730
750
880
1130
1480
1800
2200
2700
3070
3653
4410
5484
6780
8340
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.206
0.164
0.125
0.100
0.0778
16
21
28
35
46
60
76
92
110
135
165
185
210
235
275
305
335
14
18
23
30
39
50
63
77
95
115
140
155
175
200
235
260
290
13
18
23
30
40
51
70
86
105
130
155
180
210
240
280
315
375
PART - I
IS: 1554
* If required, Cables can be made with stranded conductor also. 35
CURRENT RATING in PVC Cable:
Current Rating e.g. Current Carrying Capacity of the cable is determined by the maximum permissible conductor
temperature and the ambient conditions as far as they are for the dissipation of the heat. Current Rating in various types
and size of cable are given in various tables, have been derived IS:3961 (Pt-II) 1967. The values are dependent on so
many conditions like method of laying, ground and ambient temperature, Soil conditions extra.One or all conditions may
vary from installation to installation. It is necessary to define all these parameters and to know their effects on current
rating quantitatively to work out current rating to any set of conditions:
The current ratings given in relevant table are based on the following assumptions:
1. Max. Conductor Temperature - 70 C
2. Ground temperature - 30 C.
3. AmbientTemperature - 40 C.
4. ThermalResistivityofSoil - 150 C.Cm/W.
5. ThermalResistivityofPVCCompound - 650 C.Cm/W.
6. Depth ofLaying[To highest point of - 75 C
cable laid direct in ground or to top surface of ducts]
Cable Type Typeof Installation Method of Installation.
Single Core Cable I] Laid direct in ground 1. Three cables in closed
trefoil formation, or
2. Two touching in
horizontal formation
Ii] In ducts 1. Three in trefoil formation, or
2. Two in horizontal formation.
Iii] In air 1. Three Single Core Cables are installed
in trefoil formation touching.
2. Two installed one above the other fixed
to avertical wall.
Twin &Multi core Cables Installed Singly.
InnerDiameterofduct 100mm/125mm.
-Whenmore thanonecablecircuitare run simutaneously, there isno
effect on current rating upto cable size of 70.0 Sq.mm., provided the minimum clearance between two circuits is 75 mm.
The same will apply for higher than 70.0 Sq.mm. cable size if minimum clearance is kept at 150 mm and provided that
numberofcircuitsexceedsfour,theyareinstalledinahorizentalplane.
The current rating gives in various tables are based on certain assumed condition described above. In actual practice,
these conditions may be defferent. Therefore, to determine the current rating at different installation conditions,, the
tabulated rating should be multiplied with appropriate 'rating' factors. These rating factors are as follows:
0
0
0
0
0
0
6. MethodOfInstallation:
7. SIZEOFDUCT
8.EFFECTOFGROUPINGOFTHECABLES INAIR
36.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
1 2 3 4 5 6 7 8 9 10 11 12NUMBER OF CABLES IN GROUP
GR
OU
PR
AT
ING
FA
CT
OR
RATING FACTORS
A) CABLE LAID DIRECT IN GROUND :-
i) DEPTH OFLAYING
ii) FORVARIATIONINGROUNDTEMPERATURE (FOR CABLES LAID DIRECT IN GROUND)
iii) FORGROUPRATINGFACTORS.
DEPTHOF LAYING SIZE
CMS. UPTO 25.0 ABOVE 25 ABOVE 300
SQ.MM. SQ.MM. SQ.MM. SQ.MM.
UPTO 300 SQ. MM.
75 1.00 1.00 1.00
90 0.99 0.98 0.97
105 0.98 0.97 0.96
120 0.97 0.96 0.95
150 0.96 0.94 0.92
180 OR MORE 0.95 0.94 0.91
GROUND TEMPERATURE IN DEGREE C 15 20 25 30 35 40 45
RATING FACTOR 1.17 1.12 1.06 1.00 0.94 0.87 0.79
a) GROUPRATINGFACTORSFORTWINANDMULTICORECABLESIN
HORIZENTALFORMATION,LAIDDIRECTIN THE GROUND
Numbers SPACING OF CABLES [ CENTRE TO CENTRE]
OF CABLE TOUCHING 15CM. 30CMS. 45CMS. 60CMS.
2 0.80 0.84 0.87 0.90 0.91
3 0.68 0.74 0.79 0.83 0.86
4 0.62 0.69 0.75 0.80 0.83
5 0.58 0.65 0.72 0.77 0.80
6 0.55 0.62 0.69 0.75 0.78
7 0.52 0.59 0.67 0.73 0.77
8 0.50 0.57 0.66 0.72 0.75
9 0.48 0.55 0.65 0.71 0.75
10 0.46 0.54 0.64 0.70 0.74
11 0.45 0.53 0.63 0.70 0.74
12 0.44 0.52 0.62 0.69 0.73
37.
No. of
CABLES
No. of
TIERSTOUCHING 15 CM. 30 CMS. 45 CMS. 60 CMS.
SPACING OF CABLES (CENTE TO CENTRE)
2
3
4
5
6
7
8
9
10
11
12
1
1
2
2
2
3
3
3
4
4
4
0.80
0.68
0.60
0.55
0.51
0.48
0.46
0.44
0.42
0.41
0.40
0.84
0.74
0.66
0.61
0.57
0.54
0.51
0.48
0.47
0.46
0.45
0.87
0.79
0.73
0.68
0.63
0.59
0.56
0.53
0.52
0.50
0.49
0.90
0.83
0.77
0.71
0.67
0.63
0.60
0.57
0.55
0.54
0.53
0.91
0.86
0.79
0.83
0.69
0.64
0.61
0.58
0.56
0.55
0.54
No. of
CABLESTOUCHING 15 CM. 30 CMS. 45 CMS. 60 CMS.
SPACING OF GROUPS OF CABLES (CENTRE TO CENTRE)
2
3
4
5
6
7
8
9
10
11
12
0.80
0.70
0.64
0.59
0.55
0.53
0.51
0.49
0.48
0.47
0.46
0.85
0.78
0.73
0.70
0.67
0.65
0.64
0.63
0.63
0.62
0.61
0.90
0.85
0.81
0.79
0.77
0.76
0.75
0.74
0.74
0.73
0.73
0.92
0.88
0.86
0.84
0.83
0.82
0.82
0.81
0.81
0.80
0.80
0.95
0.91
0.89
0.88
0.87
0.86
0.86
0.85
0.85
0.84
0.84
No. of
CABLESTOUCHING 15 CM. 30 CMS. 45 CMS. 60 CMS.
SPACING OF GROUPS OF CABLES (CENTRE TO CENTRE)
2
3
4
5
6
7
8
9
10
11
12
0.77
0.67
0.61
0.57
0.53
0.51
0.49
0.47
0.45
0.44
0.43
0.81
0.74
0.64
0.60
0.57
0.55
0.53
0.52
0.51
0.50
0.49
0.86
0.78
0.72
0.69
0.669
0.64
0.63
0.62
0.61
0.60
0.59
0.88
0.81
0.76
0.74
0.72
0.70
0.59
0.68
0.67
0.66
0.65
0.89
0.83
0.80
0.77
0.75
0.74
0.73
0.73
0.72
0.72
0.71
B) GROUPRATINGFACTORSFORTWINANDMULTICORECABLESIN
TIERFORMATION,LAIDDIRECTIN THE GROUND
c) GROUPRATINGFACTORSFOR CIRCUIT OF TWOSINGLECORECABLES
SIDEBYSIDE TOUCHING,HORIZENTALFORMATION,LAIDDIRECTIN THE GROUND
D) GROUPRATINGFACTORSFORCIRCUITOFTHREESINGLECORE
CABLESINTREFOILANDTOUCHING,HORIZENTALFORMATION,
LAIDDIRECTINGROUND
1.0
0.9
0.8
0.7
0.6
0.5
0.4
1.0
0.9
0.8
0.7
0.6
0.5
0.4
1.0
0.9
0.8
0.7
0.6
0.5
0.4
NUMBER OF CIRCUITS (OF THO CABLES) IN GROUP
NUMBER OF CIRCUITS IN GROUP
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
GR
OU
PR
AT
ING
FA
CT
OR
GR
OU
PR
AT
ING
FA
CT
OR
GR
OU
PR
AT
ING
FA
CT
OR
NUMBER OF CABLES IN GROUP(OF THREE CABLES)
1 2 3 4 5 6 7 8 9 10 11 12
38.
b) RATING FACTOR FOR VARIATION INTHERMAL RESISTIVITY OF SOIL
[TWO & THREE CORE SIGNLE CABLES LAID DIRECT IN GROUND]
Nominal
Area
of
Conductor
in Sq. mm.
100 120 150 200 250 300
FOR VALUE OF THERMAL RESISTIVITY OF SOIL IN C m/W0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
1.1
1.1
1.1
1.1
1.1
1.12
1.14
1.15
1.15
1.15
1.15
1.17
1.17
1.18
1.18
1.18
1.19
1.05
1.05
1.05
1.05
1.06
1.06
1.08
1.08
1.08
1.08
1.08
1.09
1.09
1.09
1.09
1.09
1.10
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.92
0.92
0.92
0.92
0.92
0.91
0.91
0.91
0.91
0.90
0.90
0.90
0.10
0.89
0.89
0.89
0.89
0.86
0.86
0.86
0.86
0.85
0.84
0.84
0.84
0.84
0.83
0.83
0.82
0.82
0.81
0.81
0.81
0.81
0.81
0.81
0.81
0.81
0.80
0.79
0.78
0.77
0.77
0.76
0.76
0.76
0.76
0.75
0.75
0.75
0.75
Nominal
Area of
Conductor
Two Cables Touching, For Value of
Thermal Resistivity of Soil C cm/W0
Three Cables in Trefoil Touching, for
Value of Thermal Resistivity of Soil Soil C cm/W0
In Sq. mm.
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
100
1.15
1.15
1.15
1.15
1.15
1.17
1.18
1.18
1.18
1.19
1.19
1.21
1.21
1.21
1.21
1.21
1.21
120
1.08
1.08
1.08
1.08
1.08
1.09
1.09
1.09
1.09
1.09
1.09
1.10
1.10
1.10
1.10
1.10
1.10
120
1.09
1.09
1.09
1.09
1.09
1.09
1.09
1.09
1.09
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.11
150
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
150
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
200
0.91
0.91
0.91
0.91
0.90
0.90
0.90
0.90
0.90
0.89
0.89
0.89
0.89
0.89
0.89
0.89
0.88
200
0.90
0.90
0.90
0.90
0.89
0.89
0.88
0.88
0.88
0.88
0.88
0.88
0.88
0.88
0.88
0.88
0.88
250
0.84
0.84
0.84
0.84
0.83
0.83
0.82
0.82
0.82
0.81
0.81
0.80
0.80
0.80
0.80
0.80
0.80
250
0.82
0.82
0.82
0.82
0.82
0.81
0.80
0.80
0.80
0.80
0.80
0.79
0.79
0.79
0.79
0.79
0.79
300
0.78
0.78
0.78
0.78
0.77
0.77
0.76
0.75
0.75
0.74
0.74
0.74
0.74
0.74
0.74
0.74
0.74
300
0.76
0.76
0.76
0.76
0.75
0.74
0.74
0.74
0.74
0.74
0.74
0.74
0.73
0.73
0.73
0.72
0.72
100
1.18
1.18
1.18
1.18
1.18
1.19
1.19
1.20
1.20
1.21
1.22
1.22
1.22
1.22
1.22
1.22
1.24
iv) FORVARIATIONINTHERMALRESISTIVITYOFSOIL
a) RATING FACTOR FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
[TWIN&MULTICORECABLESLAIDDIRECTINGROUND]
39.
B)
i) RATING FACTOR FOR DEPTH OF LAYING
CABLE INSTALLED IN DUCT :-
(TWIN & MULTICORE CABLES IN SINGLE WAY DUCTS)
ii) FOR VARIATION IN GROUND TEMPERATURE[FOR CABLES IN DUCTS]
iii) FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
a) RATING FACTOR FOR VARIATION IN THERMAL RESISTIVITY OF SOIL(TWIN & MULTICORE CABLES SINGLE WAY DUCT)
NominalArea
ofConductorin Sq. mm.
100 150 250 200 250 300
FOR VALUE OF THERMAL RESISTIVITY OF SOIL IN C cm/W0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
1.05
1.05
1.05
1.05
1.05
1.06
1.07
1.08
1.08
1.08
1.08
1.09
1.09
1.10
1.10
1.10
1.11
1.03
1.03
1.03
1.03
1.03
1.03
1.04
1.04
1.04
1.04
1.04
1.05
1.05
1.05
1.05
1.05
1.06
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.96
0.96
0.96
0.96
0.95
0.95
0.95
0.94
0.94
0.94
0.94
0.94
0.93
0.93
0.92
0.92
0.92
0.91
0.91
0.91
0.91
0.90
0.90
0.90
0.89
0.89
0.88
0.87
0.87
0.86
0.86
0.86
0.86
0.86
0.88
0.88
0.88
0.88
0.87
0.86
0.85
0.84
0.84
0.83
0.83
0.82
0.82
0.81
0.81
0.81
0.81
DEPTH OF LAYING
[CM.]
GROUND TEMPERATURE
IN DEGREE C
RATING FACTOR
15
1.17
20
1.12
25
1.06
30
1.00
35
0.94
40
0.87
45
0.79
75
90
105
120
150
180
270
360
450
540 or more
1.00
0.99
0.98
0.97
0.96
0.95
0.92
0.91
0.90
0.89
RATING FACTOR
40.
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
SIZE OF CONDUCTOR IN SQ mm.
0 100 200 300 400 500 600
GR
OU
PR
AT
ING
FA
CT
OR
b) RATING FACTOR FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
[TWO & THREE SINGLE CORE CABLES LAID DIRECT IN DUCTS]
v) RATING FACTORS FOR MULTIWAY DUCTS
Nominal Two Cables in two way ducts, For Value of Three Cables in Trefoil Ducts, For
Area of Thermal Resistivity of Soil C cm/W Value of Thermal Resistivity of Soil C cm/W
In Sq.mm.
i
(i) [FOR USE WHEN A MULTI WAY DUCT DOES NOT CONTAIN THE FULL NUMBER
OF LOADED ARMOURED CABLES]
3 WAY DUCT 6 WAY DUCT 9 WAY DUCT
NUMBER OF 1 2 4 5 7 8
LOADED CABLES
RATING FACTOR 1.15 1.07 1.10 1.04 1.10 1.05
O O
In Sq. mm.
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0
185.0
240.0
300.0
400.0
(ii) RATING FACTORS FOR WIRE
ARMOURED CABLES IN MULTIWAY DUCTS
(To Be Applied rating of Corresponding
cables in single way duct to obtain
rating for cables in multiway duct)
100
1.07
1.07
1.07
1.07
1.07
1.08
1.08
1.09
1.09
1.09
1.10
1.10
1.10
1.10
1.11
1.12
1.12
120
1.04
1.04
1.04
1.04
1.04
1.04
1.04
1.05
1.05
1.05
1.05
1.05
1.05
1.05
1.06
1.06
1.06
150
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
200
0.96
0.96
0.96
0.96
0.95
0.94
0.94
0.94
0.94
0.94
0.93
0.92
0.92
0.92
0.92
0.92
0.91
200
0.94
0.94
0.94
0.94
0.93
0.92
0.92
0.92
0.92
0.91
0.91
0.91
0.91
0.91
0.91
0.90
0.90
250
0.91
0.91
0.91
0.91
0.90
0.89
0.88
0.87
0.87
0.82
0.86
0.85
0.85
0.85
0.85
0.85
0.85
250
0.87
0.87
0.87
0.87
0.86
0.86
0.85
0.85
0.85
0.85
0.84
0.84
0.84
0.84
0.83
0.83
0.83
300
0.83
0.83
0.83
0.83
0.82
0.81
0.80
0.80
0.80
0.79
0.79
0.78
0.78
0.77
0.77
0.76
0.76
300
0.86
0.86
0.86
0.86
0.85
0.84
0.83
0.83
0.83
0.83
0.82
0.81
0.81
0.80
0.80
0.80
0.79
100
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.11
1.12
1.12
1.13
1.13
1.14
1.15
1.15
1.15
1.16
120
1.05
1.05
1.05
1.05
1.05
1.05
1.05
1.06
1.06
1.06
1.06
1.06
1.07
1.08
1.08
1.08
1.08
150
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
41.41.
SP
AC
ING
SPACING
0.76
0.790.81
0.67
0.710.74
Ducts (Pipes)approximatelytouching30 cm45 cm
Spacing ofDucts (Pipes)
0.58
0.610.63
0.54
0.570.60
SP
AC
ING
SPACING
0.76
0.78
0.70
0.75
0.64
0.67
0.61
0.64
Ducts (Pipes)approximately
touching45 cm
Spacingof
Ducts
a) GROUP RATING FACTORS FOR TWIN & MULTICORE CABLES IN
SINGLEWAY STONEWARE DUCTS AND IRON PIPES IN TIER
FORMATION [Formation of Ducts (Pipes)]
b) GROUP RATING FACTORS FOR SINGLE CORE CABLES IN TREFOIL
STONEWARE DUCTS IN TIER FORMATION
[Formation of Ducts]
i) RATING FACTOR FOR VARIATION IN AMBIENT AIR TEMPERATURE :
AIR TEMPERATURE 25 30 35 40 45
IN DEGREE C
ii) RATING FACTOR FOR THREE SINGLE CORE CABLES (AC) IN FLAT FORMATION IN AIR
(To be applied to the corresponding rating for trefoil groups in air)
NOMINAL AREA OF CONDUCTOR MM RATING FACTOR
UPTO & INCLUDING 185 1.07
240 1.10
300 1.08
400 1.04
500 1.00
v) RATING FACTOR FOR DUCTS IN TIER FORMATION
C) CABLES INSTALLED IN AIR
2
RATING FACTOR 1.25 1.16 1.09 1.00 0.90
ARRANGEMENT NO. OF
RACKS
1
2
3
6
NO. OF CABLES PER RACK
25 mm d d
1 2 3 6 9
1.00 0.98 0.96 0.93 0.92
1.00 0.95 0.93 0.90 0.89
1.00 0.94 0.92 0.89 0.88
1.00 0.93 0.90 0.87 0.86
ARRANGEMENT NO. OF
RACKS
1
2
3
6
NO. OF CABLES PER RACK
25 mm
30 cm.1 2 3 6 9
1.00 0.84 0.80 0.75 0.73
1.00 0.80 0.76 0.71 0.69
1.00 0.78 0.74 0.70 0.68
1.00 0.76 0.72 0.68 0.66
iii) RATING FACTOR FOR MULTICORE LAID ON RACK IN AIR
a) WITH SPACING BETWEEN CABLES EQUAL TO DIAMETER OF CABLE.
b) WITH CABLE TOUCHING
43.
"PAGODA" OVERLOAD & SHORT CIRCUIT RATING
PVC Insulated Cables should not been operated even for comparatively short duration, at a temperature appreciably higher
than that permissible for continuous operation, since the PVC insulation is liable to soften at higher temperature and sustain
serious damage.
It is therefore essential that such cables should be continuously operated at the rated currents given in the tables only if they
are suitably protected against excess currents arising out of fault conditions. It is assumed that duration of such faults does not
exceed four hours and protection is considered to be adequate if minimum current at which the protective device is
designed to operate does not exceed 1.5 times the tabulated rating for cables laid in air and 1.3times the tabulated rating
for cables laid direct in ground.
If by the nature of the circuit protection, It is not possible to operate the cables at the rated current under the foergoing
provisions, the cable required for a given continuous load current should be so chosen as to have that rating of the tables,
which will not less than :-
a) The given continuous current, and
b) for cables in air and in ducts, 67% of the minimum current at which the excess current protection is designed to
operate. or
For cables laid direct in ground, 77% of the minimum current at which excess protection is designed to operate.
The Conductor Size in a cable for an installation is also governed by its abilities to carry short circuit current of the system. Short
Circuit Rating are based on the assumption that duration of the short circuit is to small and apparently that there is no
transmission of heat, produced during short circuit, through the insulation and the whole of it is absorbed by the conductor.
With a high increase in KVA, capacity in power distribution system, cables are expected to carry short circuit to carry short
circuit current of high magnitude. Normally rated at 70 C,Ourinsulationmaterial permitashort circuit temperature of160 C.
With high interrupting capacity expected of a cable under short circuit , it is essential that protective fuses in the system are
designedtominimisethedurationasfaraspossible.
TheShortCircuitRatingcanbecalculatedasunder:-
Ish = K X A
T
Ish: ShortCircuitCurrentinr.m.s.KiloAmps. T : DurationofShortCircuit inseconds.
A ; AreaofConductor inSq.mm.
K ; aConstant ForAluminiumwithgeneralpurposePVCInsulation- 0.0760
ForCopperwithgeneralpurposePVCInsulation- 0.115
ForAluminiumwithHeatResistingPVCInsulation- 0.0686
ForCopperwithHeatResistingPVCInsulation- 0.104
Short Circuit Rating
0 0
44.
CONDUCTOR
SIZE
ALUMINIUM CONDUCTOR COPPER CONDUCTOR
WITH
GENERAL
PURPOSE
INSULATION
WITH
GENERAL
PURPOSE
INSULATION
WITH
HEAT
RESISTING
INSULATION
WITH
HEAT
RESISTING
INSULATION
SHORT CIRCUIT RATING FOR ONE SECOND.
SHORTCIRCUITRATING
SQ.MM. K. AMPS. K. AMPS. K. AMPS. K. AMPS.
1.5 0.114 0.103 0.173 0.156
2.5 0.190 0.172 0.288 0.260
4.0 0.304 0.274 0.460 0.416
6.0 0.456 0.412 0.690 0.624
10.0 0.760 0.686 1.150 1.040
16.0 1.220 1.100 1.840 1.66
25.0 1.900 1.720 2.880 2.60
35.0 2.660 2.400 4.030 3.64
50.0 3.800 3.430 5.750 5.20
70.0 5.320 4.800 8.050 7.28
95.0 7.220 6.520 10.90 9.88
120.0 9.120 8.230 13.80 12.50
150.0 11.40 10.30 17.30 15.60
185.0 14.10 12.70 21.30 19.20
240.0 18.20 16.50 27.60 25.00
300.0 22.80 20.60 34.50 31.20
400.0 30.40 27.40 46.00 41.60
500.0 38.00 34.30 57.50 52.00
630.0 47.90 43.20 72.50 65.50
800.0 60.80 54.90 92.00 83.20
1000.0 76.00 68.60 115.0 104.00
45.
FORMULA FOR CALCULATING VOLTAGE DROP IN A BALANCED
3 PHASEAC DISTRIBUTION SYSTEM:-
VoltageDrop[rms]PerKm.PerPhase[volts]
= 3 x x X [Max. Continuous Current Rating]
X [D.C. Resistance Per phase Per Km.(Ohm/Km.)]
Where K = 1+a[T To]
a = 0.00393 for Copper
a = 0.004 for Aluminium
T = Max. Conductor Resistance [Degree C]
To = 20 Degree C Standard Temperature.
K = Factor For Converting DC Resistance to AC Resistance.
NOMINAL COPPER ALUMINIUM
CONDUCTOR AREA CONDUCTOR CONDUCTOR
IN SQ.MM.
1.5 to 95.0 1.000 1.000
120 1.010 1.003
150 1.015 1.005
185 1.022 1.008
240 1.038 1.014
300 1.062 1.020
400 1.100 1.038
500 1.150 1.060
C
T C
AC
-
APPROXIMATE VALUES OF K FOR 1100 VOLTS CABLES ARE GIVEN BELOW:-AC
K KT AC
46.
Recommendations For Storage & Installation Of Cables
i) No drum should be stored one above the other.
ii) Drum should be stored in perfectly ground without having any projected hard stones on the ground
surface. The drums should be stored preferably in the shed.
iii) Drums should be stored and kept in such a way that bottom cable does not get
iv) Drum should be always rotated in the "Direction Arrow Of Rotation"mark on the drum. In the absence of any
such mark, the drum should be rolled in the direction in the direction same as inside the cable end and
opposite that of outside end.
v) Loading and Unloading should be done with material handling equipment Only.
vi) While laying the cable in a trench the cable ends should be pulled with pulling eye only after mounting of
the drum on the jacks.
vii) 100% drums should be checked for continuity and cross continuity tests to ensure that there is no internal
damage to the cable during transportation.
viii) Insulation Resistance should be measured with 500 V Meggar between cores and all the cores to earth
[Armour].
ix) After the cables are installed, before commissioning, it should be test for high DC Voltage test. The
recommended volts and duration of the test between each core mettalic armour [Earth] at 3KV DC is for 5
minutes. During high voltage test all electrical equipments related to the cable installation must be earthed
and adequate clearance should be maintained from the other equipment and from work to prevent flash
over.
x) Where the cable to be joined with an existing cable, the sequence of cores at two ends to be joined should
be in opposite direction i.e. if at one ends it is clockwise direction, at the other end it should be in
anticlockwise direction . This is necessary to avoid the crossing of cores during jointing. This will also decide
the direction in which the cable is to be pulled.
xi) Avoid excessively high temperature when sealing of the cable joint of cable. Cool the sealing to avoid 100 C
beforepuring.
xii) Thecableshouldbe paidoff fromthe topof the cable drum,held inthenormalposition.Sufficientcareshould
betakentoprevent twists,accutebendsetc.whilelaying.
xiii) Thedispositionofcablesupport itsspacingshouldbesuch,astopreventunduestrainordamagetothecable.
xiv) TheminimumBendingRadiusforCablesshouldnotbelessthanthevaluesshown.
Wherererpossible25%highervalueshouldbeadopted.
i) 8XDiamerterforSingleCoreCable. ii) 12XDiameterformultiCoreCable
xv) MaximumPullingTensionduringInstallation: -
CablehavingAluminiumConductor -30N.Sq.mm.Max.
CablehavingCopperConductor -50N.Sq.mm.Max.
For easy and convenient installation conditions and desired performance, following
recommendation are made:
0
damaged.
47.
RECOMMENDED "PAGODA" CABLE SIZES
FOR MOTORS WITH START-DELTA STARTER
RECOMMENDED " CABLE SIZES
FOR MOTORS WITH DOL STARTERS
PAGODA"
415 V
50Hz
KW
Approx.
full load
current in
Amps
Phase
Current
in AmpsSupply
Side
Motor
Side
Supply
Side
Motor
Side
3 Phase
415 v
50Hz
HP
415 V,
50Hz
KW
Approx
full load
current in
AmpsAluminium
(sq. mm.)
2.2
3.75
5.50
7.50
9.30
11.0
15.0
18.50
22.0
26.0
30.0
33.5
37.0
44.0
48.5
52
55
67.5
75.0
90
110
132
150
175
187.5
204
225
300
5
7.5
11
14
18
21
28
35
40
47
55
60
66
80
87
94
100
120
135
165
200
230
275
320
323
360
385
500
2.88
4.32
6.34
8.10
10.02
12.10
16.0
20.20
23.0
27.0
30.30
34.6
35.0
45.0
50
54
57.5
69
78
95
115
133
159
184.50
185
206
222
300
1.5/2.5
1.5/2.5
2.5/4
4
4
6
10
16
16
25
25
35
35
50
70
70
70
95
95
120
185
240
300/400
300/400
400
500
500
630
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
2.5
2.5
4
6
6
10
16
16
16
25
35
35
35
50
50
70
70
120
150
185
185
185
240
300/400
1.5/1.5
1.5/1.5
1.5/1.5
2.5
2.5
4
6
10
10
16
16
25
25
35
50
50
50
70
70
95
120
185
240/300
240/300
240/300
300/400
300/400
400/500
1.5/1.5
1.5/1.5
1.5/1.5
1.5/1.5
1.5
1.5
2.5
4
4
6
10
10
10
16
25
25
25
35
35
50
50
95
120
150
150
150
185
240/300
0.50
0.75
1.0
1.5
2.0
3.0
4.0
5.0
6.0
7.5
10
12.5
15
17.5
20
25
30
35
40
45
50
60
75
90
100
150
200
225
0.40
0.55
0.75
1.1
1.5
2.2
3.0
3.75
4.5
5.5
7.5
9.3
11
13
15
18.5
22
26
30
33.50
37
44
55
67.5
75
110
150
168
1.2
1.6
1.8
2.6
3.5
5
6.2
7.5
9
11
14
18
21
24
28
35
40
47
55
60
66
80
100
120
135
150
175
200
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
2.5
2.5
4
4
6
6
10
10
16
25
25
25
35
35
50
70
95
95
185
300/400
300/400
Typical Cable Size Aluminium Typical Cable Size Copper Typical Cable Size
3 Phase
415 V
HP Copper
(sq. mm.)
3
5
7.5
10
12.5
15
20
25
30
35
40
45
50
60
65
70
75
90
100
125
150
175
200
240
250
275
300
400
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2.5
2.5
4
4
6
6
10
16
16
16
25
25
35
50
70
70
150
240/300
240/300
49.
CURRENT FOR A/C MOTORSApprox. Amps per phase taken by modern induction motors, allowing reasonable efficiencies and power factors
B.H.P.
of
Motor
1/8
1/4
1/2
3/4
1
1
1
1
2
2
3
4
5
7
10
12
15
20
30
40
50
1.0
1.8
3.5
4.8
6.2
7.4
8.7
10.0
11.8
14.0
17.5
20.0
24.0
36.0
47.0
59.0
70.0
91.0
135.0
183.0
227.
0.6
1.1
2.0
3.0
4.0
4.8
5.7
6.3
7.0
8.2
9.5
12.0
14.0
21.0
27.0
34.0
40.0
53.0
78.0
105.0
130.0
0.6
1.3
2.5
3.3
4.0
4.8
5.5
6.8
7.0
8.5
10.0
12.0
14.0
21.0
26.0
32.0
38.0
51.0
75.0
100.0
120.0
0.3
0.7
1.2
1.5
2.0
2.5
3.0
3.2
3.5
4.3
5.0
6.5
7.0
10.0
13.0
15.0
19.0
25.0
38.0
50.0
60.0
0.3
0.7
1.2
1.7
2.0
2.5
2.8
3.2
3.5
4.3
5.0
6.5
8.0
12.0
15.0
19.0
22.0
29.0
42.0
56.0
71.0
0.3
0.6
1.0
1.3
1.5
1.9
2.2
2.5
2.8
3.6
4.2
5.5
7.0
10.0
13.0
16.0
19.0
25.0
36.0
47.0
58.0
0.4
0.8
1.5
1.9
2.2
2.7
3.0
3.5
4.0
5.0
6.0
7.5
9.0
13.0
17.0
21.0
25.0
33.0
48.0
63.0
79.0
0
0.6
1.0
1.7
2.2
2.5
2.8
3.2
4.0
4.5
6.0
7.0
11.0
14.0
18.0
21.0
28.0
39.0
53.0
66.0
Single Phase Two Phase Three Phase
230 Volts 230 Volts 346 Volts400 Volts 400 Volts 400 Volts 440 Volts 500 Volts
CONVERSION TABLEMultiplier
Constant
Miles to Millimeters (1000 Miles - 1 inch)
Inches to Centimetres
Yards to Metres
Miles to Kilometres
Sq. Inches to Sq. Millimetres
Circ. Miles to Sq. Millimetres
Circ. Miles to Sq. Inches
Sq. Yards to Sq. Metres
Pounds to Kilogrammes
Tons (2240 lbs.) to Kilogrammes
Cwt. to Kilogrammes
Ounces (Avolr) to Grammes
Gallons (Imp.) to Litres
Gallons (Imp.) to Cubic Inches
lbs./1000 Yards to lbs./Mile
Ohms/1000 Yards to Ohms/Mile
OHms/1000 Yards to Ohms/Km
Horse Power to Ft. Lb./Min...
Horse Power to Ft. Kilowatts..
Horse Power to Kg.m./Sec..
Watts Ft. lb./Min.
Watts to Kg.m./Sec.
Miles/Hour to Ft./Min.
Meters/Sec. to Ft./Min.
Land Miles to Nautical Miles
Temperature : F to C : Subtract 32 and Multiply by 5/9; C to F : Multiply by 9/5 and add 32.0 0 0 0
lbs./1000 Yards to-gm./Km.
lbs./Sq. Inch to-gm./mm2
0.0254
2.54
0.9144
1.6093
645.16
5.06.7 x 10
0.7854 x 10
0.08361
0.4536
1016.02
50.8
28.35
4.546
277.42
1.76
0.4961
703 x 10
1.76
1.0936
33000
0.746
76.0
44.24
0.1
88.0
197.0
0.868
-6
-6
-6
39.37
0.3937
1.0936
0.6214
0.00155
1937.5
1.273 x 10
1.196
2.2910
0.00098
0.01968
0.0353
0.22
0.003604
0.568
2.016
1422.33
0.568
0.9144
30.10
1.34
0.01316
0.022
10.0
0.01134
0.00508
1.151
6
-6
Reciprocal
of Constant
50.
GLOSSARY OF TERMS
A :
AC :
ABRASION :
RESISTANCE
ALLOY :
ACCELERATED :
AGEING
AMBIENT :
ALTERNATING :
CURRENT[A.C.]
AMPERE :
ANNEAL :
BENDING RADIUS :
BREAKDOWN :
VOLTAGE
BUNCH STRAND :
CAPACITIVE :
REACTANCE
CAPACITANCE :
COLOR CODE :
CONCENTRIC :
STRANDING
CONDUCTIVITY :
CONDUIT :
Ampere
Alternating Current
Ability of a Wire or Cable to resist surface wear.
A Combination of two or more different polymers or metal. Usually combined tomake use of different properties of each polymer or metal.
A test that simulates long time environmental condition in a relatively short time.
Condition existing at a test or operating location prior to to energizingequipments.
Electric Current that alternates or reverses polarity continuously. The numbers
of alternations per seconds are called as "Cycles" [Hertz or Hz.]
A standard unit of current and is defined as the amount of current that flows whenOne volt of emf is applied across one ohm of resistance. An Ampere of current is
produced by one coulomb of charge passing a point in one second.
To soften and relieve strains in any solid material such as metal by heating tojust below its melting point and then slowly cooling it . Annealing generallylowers the tensile strength of the material, while improving its elongation andflexibility.
Radius of curvature that a cable can bend without any adverse effect.
The Voltage at which the insulation between two conductor or one conductor &
the earth will fail and allow the electricity to conduct energy from one point toanother.
Conductors twisted together with same lay and direction.
The opposition of alternating current due to capacitance of a capacitor or cable. It
is measured in Ohms.
The ability of dielectric or insulation material between the conductors to storeenergy when a difference of potential exists between conductors. The unit ofCapacitance is Farads. Cable Capacitance is usually measured in Picofarads [pF]Per Mtr.
A system of different colours used to identify the components of cables such asConductor or group of conductors.
A group of uninsulated wired twisted together and containing a center core with
the subsequent layers spirally wrapped around the core with alternating laydirection to form a single conductor.
The ability of a material to allow electrons to flow, measured by current per unitof voltage applied. It is the reciprocal of resistivity.
A tube of metal or Plastic through which wire or cable can be run, used to protect
51.
the wire or cable from surroundings.
A Substance, usually metal Copper or Aluminium, used to transfer electricalenergy from point to point.
A very flexible insulated Cable.
A two wire transmit/receive interface.
Direct Current.
Electric Current that flows in one direction only.
An Insulating [ non conducting] medium when used in signal carrying design.
The Power dissipation in a dielectric as the result of friction produced bymolecular motion when an alternating field is applied.
The voltage which an insulation can withstand before it break down.
A number which indicates the quality of a material to resist holding an electricalcharge when placed between two conductors. It is based on a vacuum, which hasdielectric constant of 1.
: motion when an alternating field is applied.
Pertaining to static electricity, or electricity at rest.
Electromotive Force [Voltage]
The Capacity of doing work.
Loss of energy from a system due to conversion of work energy into undesirable
form usually heat. Dissipation of Electric Energy occurs when current flowsthrough a resistance.
The increase in length of a wire or cable caused by longitudinal tension.
A unit of capacity that will store one coulomb of electrical charge when one voltof electrical pressure is applied.
Composed of and/or containg iron. A ferrous metal exhibits magneticcharacterstics.
The ability of a material not to fuel a flame once the source of heat is removed.
The ability of a cable to bend in a short radius.
Flame Retardent Low Smoke.
The number of times a periodic actions occurs in one second.
An electrical connection between the circuit and earth.
Symbol used to designate current.
CONDUCTOR :
CORD :
CURRENT LOOP :
D C :
DIRECT CURRENT :
DIELECTRIC :
DIELECTRIC LOSS :
DIELECTRIC :
STRENGTH
DIELECTRIC :
CONSTANT
ELECTROSTATIC :
EMF :
ENERGY :
ENERGY :
DISSIPATION
ELONGATION :
FARADS :
FERROUS :
FLAME RESISTANCE :
FLEXIBILITY :
FRLS :
FREQUENCY :
GROUND :
I :
52.
IMPEDANCE :
INDUCTANCE :
INSULATION :
IR DROP :
LAY :
LAY DIRECTION :
LEAKAGE :
KILO :
KV :
KVA :
KW :
mA :
MEGA :
MHO :
MICRO :
MICRON :
MIL :
MILLI :
mV :
mW :
NANO :
NOISE :
PEAK :
The total opposition that a circuit offers to flow the alternating current or anyother varying current at a particular frequency.
The property of a wire which store electrical current in a magnetic field aroundthe wire. It is measured in Henrys.
A material having good dielectric properties which is used to separate theconductor from surroundings.
The designation of voltage drop in term of current and resistance.
The length measured along the axis of wire required for a single strand to makeone complete turn about the axis of conductor or cable. In a twisted pair cable,the lay length is the distance it takes for two wires to completely twist aroundeach other.
The direction of progreesive spiral twist in a cable while looking along the axis ofthe cable away from the observer. The lay direction can be left or right.
The undesirable passage of current over the surface of or through an insulator.
One Thousand [ 10 ]
Kilo Volts [ 1000 Volts.]
Kilo Volt Ampere.
Kilo Watt.
Milli Ampere.
Prefix Meaning Million.
Unit of Conductance equal to reciprocal of unit of resistance [Ohm].
Prefix meaning of One - millionth [ 10 ]
Millionth of a Meter.
A unit of length equal to one thousand of an Inch.
Prefix meaning One-thousandth [ 10 ].
Milli Volt.
Milli Watt.
One Billionth.
In a Cable or circuit, any extraneous signal which tends to interfere with thesignal normally present in or passing through the system.
The maximum instantaneous value of a vaying current or voltage.
3
-6
-3
53.
POWER :
POWER LOSS :
RATED :
TEMPERATURE
RATED VOLTAGE :
REACTANCE :
RESISTANCE [DC] :
RESISTANCE [AC] :
RMS :
PVC :
STRAND :
STRANDED :
CONDUCTOR
SHEATH :
THERMAL RATING :
TENSILE STENGTH :
TRANSMISSION LINE :
V :
VOLTAGE :
VOLTAGE DROP :
VOLTAGE RATING :
VSWR :
WALL THICKNESS :
WATT :
The amount of work per unit of time. It is expressed in Watts.
The difference between the total power delivered to a circuit or cable and powerdelivered by the circuit or cable.
The maximum temperature at which an electric component can operate for
extended period without loss of its basic properties.
The maximum voltage at which an electric component can operate for extendedperiod without undue degration or safety hazards.
A measure of combined effect of capacitance and inductance on an alternatingcurrent. The amount of such opposition varies with the frequency of current.
The opposition offered by a material to flow of current. It is expressed in Ohms.
The total opposition that a circuit offers to the flow of alternating current. It is thetotal effect of resistance, Inductance & Capacitance. It is expressed in Ohms.
Root Mean Square.
Poly Vinyl Chloride.
A Single Uninsulated Wire.
A Conductor composed of groups of uninsulated wires.
Pertaining to Twisted Insulated Conductors , the outer protection covering.
The Temperature in which a material will perform its function without undueDegration.
The pull stress required to break a bare wire or insulation.
An arrangement of two or more conductors used to transfer signal energy fromone location to another.
Volts.
Electrical Potential or electromotive force expressed in volts.
A Voltage loss occurring between any two points in a power transmission line.Such drop, Resistance, Reactance & leakage of the line.
The highest rating that may be continuously applied to a cable construction inconformance with the standard or specification.
Abbreviation for voltage standing wave ratio. It is the ratio of transferred signalvoltage as compared to reflected signal voltage measured along with the length oftransmission line.
The Thickness of Insulation or Sheath.
The unit of electrical Power.
54.
