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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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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
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ABOUT PAGODA.
Pagoda Cables Pvt. Ltd. is one of the renowned manufacturers of cables inthe 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 hasestablished a favorable image in the eyes of people for reliability and
commitment.
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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 Systemof Power & VoltageSource where the cableare beingused.
[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.
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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: -
( .
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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 D eformation : With H ot D eformation A pparatus.
iv) Loss of Mass : With Electronic Balance & Additional Ageing Oven with
Air Flow.
We procure ISI marked G.I.wire & Strips conformingto IS:3975. However, the followingTests are conducted
TYPE TESTS :-
3. STEEL STRIP/WIRE:-
2843
[For FRLS PVC / FRHF Compound].
/ FRHF
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i) Dimension : 100% with Micrometer and Vernier Callipers.
ii) Tensile Strength : 100% with Tensile Testing Machine.
iii) Dip Test : with Dip Tester.
IN PROCESS TESTINGPROCESS TESTS
a) 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. Eccentricityof InsulationWall.
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 OverInner 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.
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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.]
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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 onAC 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
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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. 0.3-0.58. 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,Antioxidantancertain special purpose additives to improve processability Electrical, Mechanical, Thermal an
Chemical 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.
TheInsulatedcoresare identifiedwitha colourscheme as per IS:1554[Pt-I]-1988as follows:
NoOfCores CoreColour
1 Red, Black,Yellow Blue or natural (non-pigmented)2 Red&Black 3 Red,Yellow&Blue.4 Red,Yellow,Blue&Black.5 Red,Yellow,Blue,Black&Grey.
In case of cable exceeding five cores, twoadjacent[Countinganddirection core] in eachlayer shall bcolored Blue, Yellow and remaining cores grey or Cores can also be identified by numbers printed othat of same colour.
Incaseof four corescableswithreduced neutral conductor[Usuallytermed as3 CoreCable]three ma
coresarecolouredRed,YellowandBlueandthereducedneutralcoreshallbeblack.
4
0
0
0
12
IdentificationofCores:
LayingupofCores:
Thecoresarelaidupwithasuitablelay.Thefinallayerhasalwaysarighthandlay.
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InnerSheath:
Armouring:
Outer Sheath :
Innersheathisprovidedoverlaidupofcores. ItisprovidedtogiveCircularShapeofthecableanditprovidebeddingfor the armouring.
IS:1554(Pt-I)- 88 permits following two methodsof applying the Inner Sheath of thermoplastic material i.e
PVC,Polyethyleneetc., Whichisnotharder than insulation.a) Here the innersheath is provided by extrusion of thermoplasti
overthelaidupofcores
(b) Here the innersheath is provided by wrapping a t hermoplastic tape.
Armouringmaterial isconformingto IS:3975.In order to protect the cable against MechanicalDamagearmouring of steel wire/strip is provided. It provides mechanical protection to inside of cores and it carries eartReturnCurrent incaseof shortcircuitof acorewitharmour.Asper IS:1554(Pt-I)- 88, RoundWire armouringis provideincablewherecalculateddiameterunderarmourisupto13mm.Abovethisthearmouriseithersteelwireorsteelstri
of size 4.00X0.80 mm. As strip construction is economical, the manufacture always provides steel strip armourinunlesswirearmouringisspecified.
In long runof cableandin case of Mines, theround wire armouris must asstripconstruction provides, higheresistance to Earthfault Current and some times this current may not be sufficient to operate the circuit breakercaseofearthfault.
In case of cables for use in mines, theresistanceofarmour shall not exceed that of the conductor of maby more than 33 percent for safety reasons. To achieve this, sometimes tinned hard drawn copper is used alon
with 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 foarmouring as in this case of return current is not passing through the same cable. Hence it will not cancel thmagneticlines producedbycurrent.Thesemagneticlines whichareoscillatingincaseof A.C.systemswillgiveriseteddy currents in magnetic armouring and hence armouring will become hot, and this may lead to failure of thcable. Generally hard drawn aluminium wires/ strips are used for armouring in this case . In D.C. System, Stee
wires/strips armouringis used.
In order to protect the cable from moisureand otherchemical erosions, a finalcovering ofPVCcompounis appliedoverarmouringin case ofarmouredcable and over innersheathin caseof unarmoured cable called a"Outer Sheath". Sometimes this outer sheath is required to be special compound to resist from termites, acidfungis,rodentetc.,weprovidethesame.
IS:1554(Pt-I)-88specifiesnominalthickness and minimum thickness ofoutersheath for Unarmoured cableand 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 continuouoperation.
[ii] Outer Sheath with type ST2 PVC Compound as per IS:5831-84 which is suitable for 85 C continuouoperation.
0
ExtrudedInnersheath :
TappedInnersheath :
0
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Instead of above two, we also provide flame Retardent Low Smoke (FRLS) PVC compound
sheathed cable on special requirement.
PVCCables are designedas perthe requirementof relevantIS specification.Following is thescheme of nomenclature.
A - AluminiumConductor when first letter of type designation. When type designation does notbeginwithAthecablehascopperconductor.Y - When at first or secondplacein type designation, it stands for PVCW - RoundSteel Wire Armouring.
WW - Steel DoubleRoundWire Armouring.FF - Steel FlatDouble Strip Armouring.
CodesforCableDesignation:
- Flat Steel Strip Armouring.
PAGODAFLAMERETARDANTLOWSMOKECABLES
&Flame Retardent Halogen Free (FRHF) Compound
F
YWY means CopperConductor, PVC insulated, RoundWire Armouredand PVC SheathedCable.
AYFYmeans Aluminium Conductor, PVCInsulated, SteelStrip ArmouredandPVCOuterSheathed.
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
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InmodernPower, Chemical,Fertilizers, Cements Plantsetc.and Public Places suchas Hospitals, RailwayStation,High Ris
CommercialComplexes, Theatres,Airportsetc.manyPVCcablesarebunchedinacableshaftoronacabletrays.Incaseoffirei
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 cost
equipmentlyingnearby,butalsopenetratestheRCCandcorrodesthesteelreinforcement.Duetothis,thereisextensivedamag
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 thuman life andproperty. Investigations have proved that under fire situations PVC emits large quantitiesof smoke and corrosiv
fumesmakingvirtuallyimpossiblefor firefightingandrescueoperations.
FRLScablesincorporatesthe followingfeatures:
1. No fire propogation.
2. Flame Retardancy.
3. Low Acid Emission- Normalcablessmoke when combineswithair moistureproduces largeamount ofhighlycorrosiv
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 generatioFRLS[Flame Retardent LowSmoke]Cables. ThesecableswithspecialPVC formulationmaterialpreventsthe propagation offlam
along thelengthwhenexposed to fire.In addition,thesecables emit lowsmoke andhalogen emission is also reduced under fir
conditions. These properties help immense fire fighting operation and prevention of further loss to costly equipment to whic
cablesareconnected.
i) Increasedresistancetoignitionrelativeofhigheroxygenindexand temperatureindex.
ii) Volumeof smoke andcorrosive fumesis minimisedbecauseof specialcompositionofprotectiveinsulationmaterial, havin
lowestrateofdecompositionandthus preventsdamagetoproperty.
iii) Dueto emissionof less smoke, lowacidemission andlowtoxicgasemission, damageto propertyand loss of life isminimise
makingfirefightingeasy.
SPECIFICATION TEST AIM TYPICALVALUES
FRLSCABLES
ASTM-D 2863 ygen To determine at room temp,the %
Index ofoxygenneededtoburn Morethan29%
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
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TABLE - 1
COMPOSITION & MAX RESISTANCE OF CONDUCTOR, CLA
& CLASS 2 (STRANDED) FOR SINGLE CORE & MULTICORAS 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
TinAI
3
3
7
7
7
7
7
7
19
19
19
37
37
37
61
61
61
61
91
Circular Compactedor shaped
Copper Conduct
MINIMUM NO. OF WIRES IN THE CONDUCTORMax. D.C. Re
Oh
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APPROXIMATE REACTANCE AT 50 HZ. (Ohm/Km.) 1.1 KV PVC & HR PV
REACTANCE
NOMINAL AREA
OF
CONDUCTOR
(SQ. MM.)
SINGLE 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
ARMOURED
TABLE - 2
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APPROXIMATE CAPACITANCE (MICRO FARADS/KM.) 1.1 KV PVC & HR PV
NOMINAL AREA
OF
CONDUCTOR
(SQ. MM.)
SINGLE CORE TWO 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
0.43
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
0.12
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
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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
WireNominal
Diameter
mm
Galvanised
Flat
Steel
StripNominal
Thickness
mm
Approx. Over
All Diameter
Unarmoured
mm
Unarm
oured
Kg/Km
Armoured
mm
Armou
red
Kg/Km
Approx. Weight
of Cables
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
Number
of
cores
No.
2
3
4
5
6
7
10
12
14
16
19
24
30
37
61
TABLE - 4
16
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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-
ouredcables
mm
Minimum
sheath
Thickness
for
Armoured
mm
cables
Galvanised
Round
Steel
Wire
NominalDiameter
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
Approx. Weight
of Cables
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
17
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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 Cable
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
150.0185.0
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
1.82.0
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
2.02.0
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
23.4025.50
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
16002000
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
0.1240.0991
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
340380
420
465
500
540
590
668
733
22
30
39
49
65
85
110
130
155
190
220
250
280305
345
375
400
425
470
533
585
23
31
42
54
72
92
120
140
165
200
230
255
280305
340
370
405
430
465
527
579
* If required, Cables can be made with stranded conductor also.18
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TABLE - 7
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNERSHEATHED & 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
120.0150.0
185.0
240.0
300.0
400.0
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
NominalThickness
ofInsulation
mm
MinimumThickness
of InnerSheath
mm
NominalThicknessof OuterSheath
mm
Approx.Overall
Diameter
mm
Approx.Weight
ofCables
Kg/Km
Max DCConductorResistance
At 20 C
Ohm/Km
Direct iGround
Amps.
19
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TABLE - 8
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNERSHEATHED & 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
120.0150.0
185.0
240.0
300.0
400.0
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
NominalThickness
ofInsulation
mm
MinimumThickness
of InnerSheath
mm
NominalThicknessof OuterSheath
mm
Approx.Overall
Diameter
mm
Approx.Weight
ofCables
Kg/Km
Max DCConductorResistance
At 20 C
Ohm/Km
Direct iGround
Amps.
20
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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
NominalThickness
MinimumThickness
of InnerSheath
mm
NominalThicknessof OuterSheath
mm
ApproxOverall
Diameter
mm
ApproxWeight
of Cables
Kg/Km
Main
Ohm/km
Neu
Ohm
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
1.15
1.15
0.72
0.52
0.38
0.26
0.26
0.19
0.15
0.12
Max. DC ConducResistance at 20
21
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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
Direc
in gr
Amp
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0
* If required, Cables can be made with stranded conductor also.
4*
6*
10
16
25
35
50
70
95120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.61.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.40.5
0.5
0.6
0.6
0.7
1.8
1.8
1.8
2.0
2.0
2.0
2.2
2.2
2.22.4
2.6
2.8
3.0
3.2
14.8
16.0
17.9
20.3
23.9
26.0
30.1
33.9
38.642.5
47.0
52.2
58.9
65.3
368
488
707
945
1418
1850
2540
3430
44505570
6910
7612
10840
13425
4.61
3.08
1.83
1.15
0.727
0.524
0.387
0.268
0.1930.153
0.124
0.0991
0.0754
0.0470
3
4
6
7
9
12
14
17
2124
27
30
34
38
22
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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
Max.
Condu
Resista
AT 20
Ohm
ARMOUR
* If required, Cables can be made with stranded conductor also.
4*
6*
10
16
25
35
50
70
95120
150
185
240
300
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.61.6
1.8
2.0
2.2
2.4
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.40.4
0.4
0.4
0.5
0.5
1.40
1.40
1.40
1.40
-----
-----
-----
-----
----------
-----
-----
-----
-----
-----
-----
-----
-----
0.80
0.80
0.80
0.80
0.800.80
0.80
0.80
0.80
0.80
1.24
1.24
1.24
1.24
1.40
1.40
1.40
1.40
1.401.56
1.56
1.56
1.72
1.88
14.50
15.60
17.10
16.50
17.80
19.30
22.00
24.00
27.0029.00
32.40
35.60
39.60
43.70
585
655
824
918
1070
1333
1660
2121
27703320
3996
4930
6170
7562
4.6
3.0
1.8
1.
0.7
0.5
0.3
0.2
0.10.1
0.1
0.09
0.0
0.06
23
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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
Max.
Condu
Resista
AT 20
Ohm
ARMOUR
* If required, Cables can be made with stranded conductor also.
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
4.6
3.0
1.8
1.
0.7
0.5
0.3
0.2
0.1
0.1
0.1
0.09
0.0
0.06
24
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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
Ma in Neutral
Sq. mm. Sq. mm
Minimum
Thickness
of Inner
Sheath
mm
Minimum
Thickness
of Outer
Sheath
mm
Approx
Overall
Diameter
mm
ApproxWeight
of Cables
kg/km
Main
Ohm/km
Neutr
Ohm/
NominalThickness
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
Max. DC ConducResistance at 20
ARMO UR
Galv.Flat
Steel StripNominal
Thickness
mm
25
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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
Max.
Condu
Resista
AT 20
Ohm
ARMOUR
* If required, Cables can be made with stranded conductor also.
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
4.6
3.0
1.8
1.
0.7
0.5
0.3
0.2
0.1
0.1
0.1
0.09
0.0
0.04
26
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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 Cable
Amps
D
1.5*2.5*
4.0*
6.0*
10.0*
16.0
25.0
35.0
50.0
70.0
95.0
120.0
150.0185.0
240.0
300.0
400.0
500.0
630.0
800.0
1000.0
0.80.9
1.0
1.0
1.0
1.0
1.2
1.2
1.4
1.4
1.6
1.6
1.82.0
2.2
2.4
2.6
3.0
3.4
3.4
3.4
1.81.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
2.0
2.0
2.02.0
2.0
2.2
2.2
2.4
2.4
2.4
2.8
6.707.40
8.00
8.50
9.30
10.80
12.50
13.70
15.80
17.80
19.70
21.80
23.4025.50
28.60
32.00
36.50
40.20
43.50
50.00
55.00
5565
75
90
105
140
190
225
300
400
500
560
665855
1070
1345
1710
2150
2564
3270
4060
18.1012.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.443
0.320
0.253
0.2060.164
0.125
0.100
0.0778
0.0605
0.0469
0.0367
0.0291
2128
36
44
54
75
97
120
145
170
205
230
265300
335
370
410
435
485
525
570
1724
31
39
51
66
86
100
120
140
175
195
220240
270
295
325
345
390
440
490
1925
33
42
56
71
93
110
130
155
180
200
220240
270
295
335
355
395
420
445
* If required, Cables can be made with stranded conductor also.27
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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
Direc
in gr
Amp
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
28
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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
D
in
A
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
* If required, Cables can be made with stranded conductor also.
29
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TABLE - 18
TYPE - THREE & HALF CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
& OVERALL PVC SHEATHED CABLE CODE - AYY
Nominal Cross
Sectional Area
Main Neutral
Sq. mm. Sq. mm
NominalThickness
NominalThickness
of InnerSheath
mm
NominalThicknessof OuterSheath
mm
ApproxOverall
Diameter
mm
ApproxWeight
of Cables
kg/km
Main
Ohm/km
Neutra
Ohm/k
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
Max. DC ConductResistance at 20 C
0
30
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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
Di
in gr
Am
Max. DC
Conductor
Resistance
AT 20 C
Ohm/Km
0
* 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
1
2
2
3
4
6
7
9
1
13
16
18
2
23
2
30
33
TABLE - 19
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
& OVERALL PVC SHEATHED CABLE CODE - AYY
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
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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
Conduc
Resistan
AT 20 C
Ohm/Km
0
1.5*
2.5*
4.0*
6.0*
10.0*
16.0
25.0
35.0
50.0
70.095.0
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
1.41.6
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
0.30.4
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
0.80.8
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
1.401.40
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
24.0027.00
29.00
32.40
35.60
39.60
43.70
49.00
400
425
535
580
700
720
760
900
1040
12551595
1835
2140
2640
3200
3850
4700
18.10
12.10
7.41
4.61
3.08
1.91
1.20
0.868
0.641
0.4430.320
0.253
0.206
0.164
0.125
0.100
0.077
* If required, Cables can be made with stranded conductor also.
32
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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
Conduc
Resistanc
AT 20 C
Ohm/Km
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
0.077
* If required, Cables can be made with stranded conductor also.
33
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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.
Neu
Ohm
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 Condu
Resistance AT 20
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
1.9
1.9
1.2
.86
0.6
0.4
0.4
0.3
0.2
0.2
0.1
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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
Conduc
Resistanc
AT 20 C
Ohm/Km
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
* If required, Cables can be made with stranded conductor also. 35
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CURRENT RATING in PVC Cable:
Current Rating e.g. Current Carrying Capacity of the cable is determined by the maximum permissible conductortemperature 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 somany 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 currentrating quantitatively to work out current ratingto anyset of conditions:
Thecurrent ratings given in relevant table arebased on thefollowingassumptions:
1. Max. Conductor Temperature - 70 C
2. Ground temperature - 30 C.
3. AmbientTemperature - 40 C.
4. ThermalResistivityofSoil - 150 C.Cm/W.
5. ThermalResistivity of PVC Compound - 650 C. Cm/W.
6. Depth of Laying[To highest point of - 75 C
cable laid directin groundor to top surface of ducts]
Cable Type Type of Installation Method of Installation.
SingleC oreC able I] Laid direct in ground 1. Three cablesin closed
trefoil formation, or
2. Two touchingin
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 installedone above theother fixed
to a vertical wall.
Twin & Multi core Cables Installed Singly.
InnerDiameterofduct 100mm/125mm.
-Whenmorethanonecablecircuitarerunsimutaneously,thereisnoeffecton current ratinguptocablesize of 70.0 Sq.mm.,provided theminimum clearancebetween twocircuitsis 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
numberof circuitsexceedsfour,theyare installedina horizentalplane.
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
tabulatedrating shouldbe multiplied with appropriate 'rating' factors.These ratingfactors are as follows:
0
0
0
0
0
0
6. MethodOfInstallation:
7. SIZEOF DUCT
8.EFFECTOFGROUPINGOFTHECABLESINAIR
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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 1
NUMBER OF CABLES IN GROUP
GROUP
RATING
FACTOR
RATING FACTORS
A) CABLE LAID DIRECT IN GROUND :-
i) DEPTH OF LAYING
ii) FORVARIATIONINGROUNDTEMPERATURE (FOR CABLES LAID DIRECT INGROUND)
iii) FORGROUPRATINGFACTORS.
DEPTH OF 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) GROUPRATINGFACTORSFORTWIN ANDMULTICORECABLESIN
HORIZENTALFORMATION, LAIDDIRECTIN THE GROUND
Numbers SPACING OFCABLES[CENTRETOCENTRE]
OFCABLE 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
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No. of
CABLES
No. of
TIERS
TOUCHING 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) GROUPRATINGFACTORSFORCIRCUITOF THREESINGLECORE
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
GRO
UP
RATING
FACTOR
GROUP
RATING
FACTOR
GROUP
RATING
FACTO
R
NUMBER OF CABLES IN GROUP(OF THREE CABLES)
1 2 3 4 5 6 7 8 9 10 11 12
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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
10.016.0
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
1.151.17
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
1.081.09
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
1.091.09
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
1.001.00
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
1.001.00
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
0.900.90
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
0.890.89
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
0.830.83
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
0.820.81
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
0.770.77
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
0.750.74
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
1.181.19
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 FORVARIATIONIN THERMAL RESISTIVITYOF SOIL
[TWIN&MULTICORECABLESLAIDDIRECTINGROUND]
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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
25.035.0
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
1.071.08
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
1.041.04
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
1.01.0
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
0.950.94
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
0.900.89
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
0.850.84
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
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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
GROUP
RATINGF
ACTOR
b) RATING FACTOR FOR VARIATION INTHERMAL RESISTIVITY OFSOIL
[TWO & THREE SINGLE CORE CABLES LAID DIRECT IN DUCTS]
v) RATINGFACTORSFORMULTIWAY 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 DOESNOT CONTAIN THE FULLNUMBER
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
95.0120.0
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 obtainrating 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
1.101.10
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
1.051.05
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
1.001.00
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
0.930.92
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
0.910.91
0.91
0.91
0.91
0.90
0.90
250
0.91
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