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
*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 Sq.mm. & 2.5 Sq.mm.
conforming to IS: 1554 [PT-I] : 88.
* FRLS PVC / FRHF Compound Sheathed Unarmoured/Armoured Cables
SELECTION OF CABLE
The following points should be taken into consideration before selecting any particular size and
type of cable.
[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.
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:-
TEST ON RAW MATERIALS
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.
1.Conductor: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
:
(For Tinned conductors only)
iv) Wrapping Test
100% for wires up to 0.4mm. Diameter Finer wires by sampling of
10% on lot basis.
:
100% Wrapping is done manually.
(For Aluminium Conductor Only)
v) Tensile Strength
:
100% on Tensile Testing Machine.
(For Aluminium Conductor Only)
2. P.V.C. Compound.
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 2843
[For FRLS PVC / FRHF Compound].
ix)
HCL Gas Generation Test
:
With HCL Gas Emission Test Appartus Specification IEC-754-1.
[For FRLS PVC / FRHF Compound]
TYPE TESTS :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.
3. STEEL STRIP/WIRE:We procure ISI marked G.I. wire & Strips conforming to IS:3975. However, the following Tests are conducted
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
TESTS
a)
CONDUCTOR STRANDING
1.
2.
3.
4.
Dimension of Conductor.
Lay Length & Direction of Lay.
Surface and Shape of Conductor
D.C. Resistance.
b)
INSULATION
[PVC EXTRUSION]
1.
2.
3.
4.
Dimension of Core.
Insulation Thickness.
Eccentricity of Insulation Wall.
Spark Test.
c)
LAYING OF CORES.
1.
2.
3.
4.
5.
6.
Sequence of Cores.
Lay Length & Direction of Lay.
Laid Up Diameter.
Circularity of Cable.
High Voltage Test.
Conductor Resistance Test.
d)
INNER SHEATH
[PVC EXTRUSION]
1.
2.
3.
4.
5.
6.
Surface.
Concentricity.
Thickness.
Diameter Over Inner Sheath.
High Voltage Test.
Conductor Resistance Test.
e)
ARMOURING
f)
OUTER SHEATH
[PVC EXTRUSION]
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5
Number & Size of Wire/Strip.
Lay Length & Direction of Lay.
Dia. Over Armouring.
Uniformity & Circularity of Cable.
High Voltage Test.
Conductor Resistance Test.
Surface.
Concentricity.
Thickness.
Overall Diameter.
Embossing with requisite Information on outer sheath.
6.
All the cables drums leaving "Pagoda" works undergo the following tests at final stage of manufacturer:
ROUTINE TESTS
i)
ii)
iii)
Conductor Resistance Test
High Voltage Test.
Armour Resistance Test (For Mining Cable)
ACCEPTANCE TESTS
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
ix)
x)
xi)
Conductor Resistance Test
Annealing Test [For Copper]
Tensile strength Test [For Aluminium]
Wrapping Test [For Aluminium]
Thickness of Insulation, Inner sheath & Outer Sheath.
Tensile Strength & Elongation Test of Insulation & Outer Sheath.
Insulation Resistance Test.
High Voltage Test at Room Temperature Test.
Oxygen & Temperature Index test [For FRLS PVC / FRHF Compound Insulation & Sheath.]
Smoke Density Test[For FRLS PVC / FRHF Compound Insulation & Sheath.]
HCL Gas Generation Test[For FRLS PVC / FRHF Compound Insulation & Sheath.]
TYPE TESTS
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 / FRHF Compound Insulation & Sheath.]
xiv)
Smoke Density Test[For FRLS PVC / FRHF Compound Insulation & Sheath.]
xv)
HCL Gas Generation Test[For FRLS PVC / FRHF Compound Insulation & Sheath.]
xvi)
Test for Armouring Wires/strips.
xvii)
Insulation Resistance Test.
xviii)
High Voltage Test [Water Immersion & at Room temperature]
xix)
Flammability Test.
OPTIONAL TESTS
i)
ii)
Iii)
Cold Bend Test.
Cold Impact Test.
Armour Resistance Test [for other than Mining Cable]
7.
Cable Design & Construction
IS:1554(Pt-I) : 88
Armoured and Unarmoured Single Core, Twin Core, Three Core and Multicore Copper or
Aluminium conductor PVC Insulated & Sheathed cables for Electric supply and control purposes
for use on AC voltage upto & including 1100 V or DC upto & including 1500 V to earth.
Conductor:
The most acceptable metals for conductors are Copper or Aluminium due to their high conductivity
and ductility. Therefore, Conductor material normally employed in PVC Cables are O, H2, or H4 EC
grade Aluminium or high conductivity annealed copper or annealed tinned copper conforming in
all respect to IS: 8130:84.
As Copper gets higher affinity with Sulphur, it corrodes in the atmostphere where Sulphur fumes are
present. In these conditions, tinned copper shall be used. Power Cables are mostly manufactured
with Aluminium .Use of Copper has been restricted to Control Cables, Signalling Cables and
Mining 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 Stranded
Construction is adopted i.e.made of number of strands, arranged in spiral layers in
1+6+12+18+24......formations.
Shaping of conductor is necessary in making Multicore Cables sizes above 10.0 Sq.mm. In
aluminium & 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 , they
form a complete circle.
Insulation:
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 process
only. It is resistant to moisure, oils, alkalies, good dielectric and having high Insulation Resistance
values, Fire Retarding, Permanent Colours .
Properties of General Purpose PVC Compound:
S.No.
Properties
Values
1.
2.
Specific Gravity
2
Tensile Strength(N/mm )
1.3 - 1.45
16.0to18.5
8.
3.
4.
5.
6.
CompressionStrength
0.75-1.25
Elongation %
220-300
HardnessRockwell(ShoreA)
50-100
ThermalConductivity104
3-4
0
Cal/Sec/Sq.Cm./1( C/Cm.)
7.
SpecificHeat,Cal/0C/gm.
0.3-0.5
0
8.
ThermalResistitvity, C.Cm./W
600-650
9.
DielectricConstant,50-60Cycle
5-6
10.
DielectricStrengthKV/mm.
20-40
12
11.
VolumeResistivity10 Ohm-Cm.
10-1000
12.
DissipationFactor,50-60Cycle
0.10-0.15
___________________________________________________________________________
PVC Compound is made of PVC resin, blended with Plastisizers, Stablizers, fillers, Lubricants, Antioxidant and
certain special purpose additives to improve processability Electrical, Mechanical, Thermal and
Chemical Propertiesandalsootherspecial requirements.
We also provide Heat Resistance (H.R.) PVC Compound Flame Retardent low smoke (FRLS) PVC
Compound & Flame Retardent Halogen Free (FRHF) Compund insulation on special requirement.
IdentificationofCores:
TheInsulatedcoresareidentifiedwithacolourscheme as per IS:1554[Pt-I]-1988as follows:
NoOfCores
1
2
3
4
5
CoreColour
Red,Black,Yellow Blue or natural (non-pigmented)
Red&Black
Red,Yellow&Blue.
Red,Yellow,Blue&Black.
Red,Yellow,Blue,Black&Grey.
In case of cable exceeding five cores, two adjacent [Counting and direction core] in each layer shall be
colored Blue, Yellow and remaining cores grey or Cores can also be identified by numbers printed on
that of same colour.
In case of four cores cables with reduced neutral conductor[Usually termed as 3½ Core Cable] three main
coresarecolouredRed,YellowandBlueandthereducedneutralcoreshallbeblack.
LayingupofCores:
Thecoresarelaidupwithasuitablelay.Thefinallayerhasalwaysarighthandlay.
9.
InnerSheath:
Inner sheath is provided over laid up of cores. It is provided to give Circular Shape of the cable and it provides
beddingfor 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.
ExtrudedInnersheath
: Here the innersheath is provided by extrusion of thermoplastic
a)
overthelaidupofcores
TappedInnersheath : Here theinnersheathis provided by wrapping at hermoplastic tape.
(b)
Armouring:
Armouring material is conforming to IS:3975. In order to protect the cable against Mechanical Damages ,
armouring of steel wire/strip is provided. It provides mechanical protection to inside of cores and it carries earth
ReturnCurrent incaseofshortcircuitofacorewitharmour.AsperIS:1554(Pt-I)-88, RoundWirearmouringisprovided
incablewherecalculateddiameterunderarmourisupto13mm.Abovethisthearmouriseithersteelwireorsteelstrip
of size 4.00X0.80 mm. As strip construction is economical, the manufacture always provides steel strip armouring
unlesswirearmouringisspecified.
In long run of cable and in case of Mines, the round wire armour is must as strip construction provides, higher
resistance to Earthfault Current and some times this current may not be sufficient to operate the circuit breaker in
caseofearthfault.
In case of cables for use in mines, the resistance of armour shall not exceed that of the conductor of main
by more than 33 percent for safety reasons. To achieve this, sometimes tinned hard drawn copper is used along
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 for
armouring as in this case of return current is not passing through the same cable. Hence it will not cancel the
magneticlines producedbycurrent.Thesemagneticlines whichareoscillatingincaseofA.C.systemswillgiveriseto
eddy currents in magnetic armouring and hence armouring will become hot, and this may lead to failure of the
cable. Generally hard drawn aluminium wires/ strips are used for armouring in this case . In D.C. System, Steel
wires/strips armouringisused.
Outer Sheath :
In order to protect the cable from moisure and other chemical erosions, a final covering of PVC compound
is applied over armouring in case of armoured cable and over inner sheath in case of unarmoured cable 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 cables
and minimum thickness ofoutersheath for Armoured Cables.
It permits the following types of PVCcompound for sheathing.
0
[i] Outer Sheath with type ST1 PVC Compound as per IS:5831-84 which is suitable for 70 C continuous
operation.
0
[ii] Outer Sheath with type ST2 PVC Compound as per IS:5831-84 which is suitable for 85 C continuous
operation.
10.
Instead of above two, we also provide flame Retardent Low Smoke (FRLS) PVC compound &
Flame Retardent Halogen Free (FRHF) Compound sheathed cable on special requirement.
CodesforCableDesignation:
PVC Cables are designed as per the requirement of relevant IS specification. Following is the
scheme of nomenclature.
A - Aluminium Conductor when first letter of type designation. When type designation does not
begin with A the cable has copper conductor.
Y
- When at first or second place in type designation, it stands for PVC
W - Round Steel Wire Armouring.
F
- Flat Steel Strip Armouring.
WW - Steel Double Round Wire Armouring.
FF - Steel Flat Double Strip Armouring.
YWY means Copper Conductor, PVC insulated, Round Wire Armoured and PVC Sheathed Cable.
AYFYmeansAluminiumConductor, PVCInsulated,SteelStripArmouredandPVCOuterSheathed.
PAGODAFLAMERETARDANTLOWSMOKECABLES
Power Cable
TYPICAL EXAMPLES OF DESIGN & CONSTRUCTION
AS PER IS:1554
Steel Strip, armoured
Control Cable
Steel Strip, armoured
IS Specification
Conductor :
8130
Conductor :
EC grade
High conductivity
Aluminium
Grade copper
Insulation :
5831
Insulation :
PVC type
PVC type
A or C
A or C
Inner Sheath :
5831
Inner Sheath :
PVC type
PVC type
ST1 nor ST2
ST1 nor ST2
Armour :
3975
Armour :
Galvanised
Galvanised
Steel strip
Steel strip
Outer Sheath :
5831
Outer Sheath :
PVC type
PVC type
ST1 or St2
ST1 or ST2
CLASSIFICATION OF PVC COMPOUND
Type
Application
Max.Conductor
0
A
Insulation
70 C
0
C
Insulation
85 C
0
ST1
Sheath
70 C
0
ST2
Sheath
85 C
11.
In modern Power, Chemical, Fertilizers, Cements Plants etc. and Public Places such as Hospitals, Railway Station, High Rise
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
fumesmakingvirtuallyimpossibleforfirefightingandrescueoperations.
FRLS PVC SHEATHEDCABLES
FRLScablesincorporatesthefollowingfeatures:
1.
No fire propogation.
2.
Flame Retardancy.
3.
Low Acid Emission - Normal cables smoke when combines with air moisture produces large amount of highly corrosive
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[Flame Retardent Low Smoke] Cables. These cables with special PVC formulation material prevents the propagation of flame
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.
Advantagesof"PAGODAFRLS PVC SHEATHED CABLES" CABLES UnderFireConditions:
i)
ii)
iii)
Increasedresistancetoignitionrelativeofhigheroxygenindexandtemperatureindex.
Volume of smoke and corrosive fumes is minimised because of special composition of protective insulation material, having
lowestrateofdecompositionandthuspreventsdamagetoproperty.
Due to emission of less smoke, low acid emission and low toxic gas emission, damage to property and loss of life is minimised
makingfirefightingeasy.
SPECIFICATION
TEST
AIM
TYPICALVALUES
FRLS CABLES
Oxygen
Index
To determine at room temp, the %
Index of oxygen needed to burn
the insulating material
ASTM-D 2863
& BICC
Handbook
Chp. No. 6
Temperature
Index
To determine temp. At which 21%
Oxygen in the air will burn
the insulating material.
ASTM-D 2843
Smoke
Density
To determine the visibility in case
the Insulating Material ever
catches fire. (Transmission of Light)
More than 40%
IEC 754-1
Acid Gas
Generation
To determine the amount of
Hydro Chloric, Hydro-Flouric and
Halogen Acid Gases produced from
burning of Insulating Material.
Less than 20%
ASTM-D 2863
12.
More than 29 %
0
More than 250 C
TABLE - 1
COMPOSITION & MAX RESISTANCE OF CONDUCTOR, CLASS I (SOLID)
& CLASS 2 (STRANDED) FOR SINGLE CORE & MULTICORE CABLES.
AS PER IS - 8130/1984
MINIMUM NO. OF WIRES IN THE CONDUCTOR
0
Max. D.C. Resistance at 20 C
Ohms/Km.
Class 2 (Stranded)
Circular Conductor
Non-Compacted
Circular Compacted
or shaped
Copper Conductor
Aluminium
Conductor
Sq. mm.
Cu/AI
Cu
AI
Cu
AI
Plain wires
Tinned wires
1.5
1
3
3
---
---
12.1
12.2
18.1
2.5
1
3
3
---
---
7.41
7.56
12.1
4
1
7
7
---
---
4.61
4.70
7.41
6
1
7
7
---
---
3.08
3.11
4.61
10
---
7
7
6
6
1.83
1.84
3.08
16
---
7
7
6
6
1.15
1.16
1.91
25
---
7
7
6
6
0.727
0.734
1.20
35
---
7
7
6
6
0.524
0.529
0.868
50
---
19
19
6
6
0.387
0.391
0.641
70
---
19
19
12
12
0.268
0.270
0.443
95
---
19
19
15
15
0.193
0.195
0.320
120
---
37
37
18
18
0.153
0.154
0.253
150
---
37
37
18
18
0.124
0.126
0.206
185
---
37
37
30
30
0.0991
0.100
0.164
240
---
61
61
34
34
0.0754
0.0762
0.125
300
---
61
61
34
34
0.0601
0.0607
0.100
400
---
61
61
53
53
0.0470
0.0475
0.0778
500
---
61
61
53
53
0.0366
0.0369
0.0605
630
---
91
91
53
53
0.0283
0.0286
0.0469
13
TABLE - 2
REACTANCE
APPROXIMATE REACTANCE AT 50 HZ. (Ohm/Km.) 1.1 KV PVC & HR PVC CABLES
NOMINAL AREA
OF
CONDUCTOR
(SQ. MM.)
SINGLE CORE
UNARMOURED
MULTI CORE
ARMOURED
1.5
0.167
----------
0.109
2.5
0.156
----------
0.105
4.0
0.147
0.163
0.101
6.0
0.137
0.152
0.0949
10.0
0.126
0.139
0.0890
16.0
0.116
0.130
0.0859
25.0
0.111
0.122
0.0842
35.0
0.105
0.116
0.0824
50.0
0.0984
0.108
0.0794
70.0
0.0934
0.105
0.0764
95.0
0.0914
0.100
0.0761
120.0
0.0878
0.0962
0.0738
150.0
0.0866
0.0945
0.0738
185.0
0.0852
0.0924
0.0737
240.0
0.0834
0.0908
0.0732
300.0
0.0830
0.0902
0.0729
400.0
0.0815
0.0879
0.0725
14
TABLE - 3
CAPACITANCE
APPROXIMATE CAPACITANCE (MICRO FARADS/KM.) 1.1 KV PVC & HR PVC CABLES.
NOMINAL AREA
OF
CONDUCTOR
(SQ. MM.)
SINGLE CORE
UNARMOURED
TWO CORE
THREE & HALF
& FOUR CORE
ARMOURED
1.5
0.43
----------
0.12
0.35
2.5
0.52
----------
0.13
0.41
4.0
0.57
----------
0.14
0.46
6.0
0.67
----------
0.16
0.52
10.0
0.83
----------
0.18
0.63
16.0
0.97
----------
0.19
0.82
25.0
1.00
0.83
0.22
0.86
35.0
1.15
0.95.
0.24
0.98
50.0
1.26
0.95
0.24
1.00
70.0
1.32
1.12
0.26
1.16
95.0
1.36
1.17
0.26
1.18
120.0
1.49
1.28
0.28
1.31
150.0
1.52
1.32
0.28
1.28
185.0
1.53
1.30
0.28
1.30
240.0
1.54
1.37
0.28
1.34
300.0
1.60
1.40
0.29
1.37
400.0
1.70
1.50
0.29
1.43
15
TABLE - 4
IS: 1554
TYPE - 1.5 SQ.MM. MULTI CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, ARMOURED/UNARMOURED & OVERALL PVC SHEATHED
PART - I
CABLE CODE - YY/YWY/YFY
ARMOUR
Nominal
Galvanised Galvanised Sheath
Flat
Round
Thickness
Steel
Steel
for
Strip
Wire
UnarmNominal
Nominal
oured
Thickness
Diameter
Minimum
Sheath
Thickness
for
Armoured
Number
of
cores
Nominal
Thickness
of
Insulation
Min.
Thickness
of
Inner
Sheath
No.
mm
mm
mm
mm
mm
mm
2
3
4
5
6
7
10
12
14
16
19
24
30
37
61
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
Approx. Over
All Diameter
Unarmoured Armoured
mm
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
16
Approx. Weight
of Cables
Unarm
Armou
oured
red
Max.
DC
Conductor
Resistance
at
0
20 C
Current Ratings
Direct
in
ground
In
Ducts
In
Air
mm
Kg/Km
Kg/Km
Ohm/Km
Amps.
Amps.
Amps.
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
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 - 5
IS: 1554
TYPE - 2.5 sq.mm. MULTI CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, ARMOURED/UNARMOURED & OVERALL PVC SHEATHED
PART - I
CABLE CODE - YY/YWY/YFY
Number
oif
cores
No.
2
3
4
5
6
7
10
12
14
16
19
24
30
37
61
Nominal
Thickness
of
Insulation
mm
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
Min.
Thickness
of
Inner
Sheath
mm
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
ARMOUR
Nominal
Galvanised Galvanised Sheath
Thickness
Round
Flat
for
Steel
Steel
UnarmWire
Strip
oured
Nominal
Nominal
cables
thickness
Diameter
mm
1.4
1.4
1.4
1.4
1.4
1.4
1.4
---------
mm
-------0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
mm
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
Minimum
sheath
Thickness
for
Armoured
cables
mm
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
Approx. Over
All Diameter
Unarm
oured
Armou
red
Approx. Weight
of Cables
Unarm
oured
Armou
red
Max.
DC
Conductor
Resistance
Current Ratings
Direct
in
ground
In
Ducts
In
Air
Amps.
Amps.
at 20° C
mm
mm
Kg/Km
Kg/Km
Ohm/Km
Amps.
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
17
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
TABLE - 6
IS: 1554
TYPE - SINGLE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION & OVERALL PVC SHEATHED
CABLE CODE - YY
PART - I
Nominal
Cross
Sectional
Area
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
500.0
630.0
800.0
1000.0
Nominal
Thickness
of
Insulation
mm
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
Nominal
Thickness
of Outer
Sheath
mm
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
Approx.
Overall
Diameter
mm
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
Approx.
Weight
of
Cables
Kg/Km
55
80
100
130
170
240
260
440
610
840
1090
1300
1600
2000
2550
3200
4200
5250
6400
8200
10200
* If required, Cables can be made with stranded conductor also.
Max. DC
Conductor
Resistance
Current Ratings
Direct in ground
In Duct
In Air
AT 20° C
Ohm/Km
2 Cables
3 Cables
2 Cables
3 Cables
Amps.
Amps.
Amps.
Amps.
22
35
46
57
75
94
125
150
180
220
265
300
340
380
420
465
500
540
590
668
733
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
18
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
2 Cables
Amps.
3 Cables
Amps.
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
TABLE - 7
IS: 1554
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED & OVERALL PVC SHEATHED
CABLE CODE - YY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Sq. mm
mm
mm
mm
4*
1.0
0.3
1.0
1.0
1.0
1.5
6*
2.5
10
4.0
16
6.0
10.0
25
16.0
35
25.0
50
35.0
70
50.0
95
70.0
120
95.0
120.0
150
150.0
185
185.0
240
240.0
300.0
300
400.0
PART - I
Approx.
Weight
of
Cables
Max DC
Conductor
Resistance
mm
Kg/Km
Ohm/Km
1.8
13.0
297
0.3
0.3
0.3
1.8
1.8
1.8
14.5
15.6
16.5
1.2
1.2
1.4
0.3
0.3
0.3
2.0
2.0
2.0
1.4
1.6
1.6
0.3
0.4
0.4
1.8
2.0
2.2
2.4
At 20° C
Current Ratings
Direct in
Ground
In Duct
In Air
Amps.
Amps.
Amps.
4.61
41
35
35
375
475
562
3.08
1.83
1.15
50
70
90
45
58
75
45
60
78
19.4
21.0
23.7
790
1033
1370
0.727
0.524
0.387
115
140
165
97
120
145
105
125
155
2.0
2.2
2.2
26.3
30.4
32.8
1766
2375
2985
0.268
0.193
0.153
205
245
285
180
215
235
195
230
265
0.4
0.4
0.5
2.2
2.2
2.4
35.8
39.3
44.5
3470
4328
5465
0.124
0.0991
0.0754
320
360
425
270
300
345
305
350
410
0.5
2.6
49.1
6786
0.0601
480
385
465
* If required, Cables can be made with stranded conductor also.
19
TABLE - 8
IS: 1554
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED & OVERALL PVC SHEATHED
CABLE CODE - YY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Sq. mm
mm
mm
mm
4*
1.0
0.3
1.0
1.0
1.0
1.5
6*
2.5
10
4.0
16
6.0
10.0
25
16.0
35
25.0
50
35.0
50.0
70
95
70.0
120
95.0
120.0
150
150.0
185
185.0
240
240.0
300.0
300
400.0
PART - I
Approx.
Weight
of
Cables
Max DC
Conductor
Resistance
At 20° C
Direct in
Ground
In Duct
In Air
mm
Kg/Km
Ohm/Km
Amps.
Amps.
Amps.
1.8
13.7
393
4.61
36
30
30
0.3
0.3
0.3
1.8
1.8
1.8
14.8
16.5
17.8
510
620
735
3.08
1.83
1.15
45
60
77
38
50
64
39
52
60
1.2
1.2
1.4
0.3
0.3
0.3
2.0
2.0
2.0
21.2
21.3
26.1
1095
1355
1850
0.727
0.524
0.384
99
120
145
81
99
125
90
110
135
1.4
1.6
1.6
0.3
0.4
0.4
2.2
2.2
2.2
29.7
33.7
36.7
2500
3400
4200
0.268
0.193
0.153
175
210
240
150
175
195
165
200
230
1.8
2.0
2.2
0.4
0.4
0.5
2.4
2.4
2.8
40.6
44.9
51.0
5200
6200
8000
0.124
0.0991
0.0754
270
300
345
225
255
295
265
305
355
2.4
0.6
3.0
56.5
9900
0.0601
385
335
400
* If required, Cables can be made with stranded conductor also.
20
Current Ratings
TABLE - 9
IS: 1554
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
Nominal
Thickness
of Insulation
Main
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx
Overall
Diameter
Approx
Weight
of Cables
PART - I
Max. DC Conductor
0
Resistance at 20 C
Current Ratings
Main
Neutral
Direct in
Ground
In
Ducts
In
Air
Amps
Amps
Amps
Neurtral
mm
mm
mm
mm
mm
Kg/Km
Ohm/km
Ohm/km
16
1.2
1.0
0.3
2.00
23.90
1313
0.727
1.150
99
81
90
35
16
1.2
1.0
0.3
2.00
26.20
1600
0.524
1.150
120
99
110
50
25
1.4
1.2
0.3
2.20
29.50
2230
0.387
0.727
145
125
135
70
35
1.4
1.2
0.4
2.20
33.50
3020
0.268
0.524
175
150
165
95
50
1.6
1.4
0.4
2.20
37.50
3975
0.193
0.387
210
175
200
120
70
1.6
1.4
0.5
2.40
41.20
4960
0.153
0.268
240
195
230
150
70
1.8
1.4
0.5
2.40
43.80
6020
0.124
0.268
270
225
265
185
95
2.0
1.6
0.5
2.60
47.70
7420
0.0991
0.193
300
255
305
240
120
2.2
1.6
0.6
3.00
56.60
9440
0.0754
0.153
345
295
355
300
150
2.4
1.8
0.6
3.20
62.50
11670
0.0601
0.124
385
335
400
Sq. mm.
Sq. mm
25
21
TABLE - 10
IS: 1554
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED OVERALL PVC SHEATHED
PART - I
CABLE CODE - YY
Current Ratings
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Approx.
Weight
of Cables
Max. DC
Conductor
Resistance
0
AT 20 C
Direct
in ground
In
Duct
In
Air
Sq. mm
mm
mm
mm
mm
Kg./Km
Ohm/Km
Amps.
Amps.
Amps.
4*
1.0
0.3
1.8
14.8
368
4.61
36
30
30
6*
10
16
1.0
1.0
1.0
0.3
0.3
0.3
1.8
1.8
2.0
16.0
17.9
20.3
488
707
945
3.08
1.83
1.15
45
60
77
38
50
64
39
52
66
25
35
50
1.2
1.2
1.4
0.3
0.3
0.3
2.0
2.0
2.2
23.9
26.0
30.1
1418
1850
2540
0.727
0.524
0.387
99
120
145
81
99
125
90
110
135
70
95
120
1.4
1.6
1.6
0.3
0.4
0.5
2.2
2.2
2.4
33.9
38.6
42.5
3430
4450
5570
0.268
0.193
0.153
175
210
240
150
175
195
165
200
230
150
185
240
1.8
2.0
2.2
0.5
0.6
0.6
2.6
2.8
3.0
47.0
52.2
58.9
6910
7612
10840
0.124
0.0991
0.0754
270
300
345
225
255
295
265
305
355
300
2.4
0.7
3.2
65.3
13425
0.0470
385
335
400
* If required, Cables can be made with stranded conductor also.
22
TABLE - 11
IS: 1554
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED
GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED.
PART - I
CABLE CODE - YWY/YFY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Sq. mm
mm
4*
ARMOUR
Minimum
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Approx.
Weight
of Cables
Max. DC
Conductor
Resistance
0
AT 20 C
Direct
in ground
In
Duct
In
Air
Current Ratings
Galvanised
Round
Steel Wire
Nominal
Diameter
Galvanised
at
Steel Strip
Nominal
Thickness
mm
mm
mm
mm
mm
Kg./Km
Ohm/Km
Amps.
Amps.
Amps.
1.0
0.3
1.40
-----
1.24
14.50
585
4.61
41
35
35
6*
10
16
1.0
1.0
1.0
0.3
0.3
0.3
1.40
1.40
1.40
-------------
1.24
1.24
1.24
15.60
17.10
16.50
655
824
918
3.08
1.83
1.15
50
70
90
44
58
75
45
60
78
25
35
50
1.2
1.2
1.4
0.3
0.3
0.3
-------------
0.80
0.80
0.80
1.40
1.40
1.40
17.80
19.30
22.00
1070
1333
1660
0.727
0.524
0.387
115
140
165
97
120
145
105
125
155
70
95
120
1.4
1.6
1.6
0.3
0.4
0.4
-------------
0.80
0.80
0.80
1.40
1.40
1.56
24.00
27.00
29.00
2121
2770
3320
0.268
0.193
0.153
205
240
275
180
215
235
195
230
265
150
185
240
1.8
2.0
2.2
0.4
0.4
0.5
-------------
0.80
0.80
0.80
1.56
1.56
1.72
32.40
35.60
39.60
3996
4930
6170
0.124
0.0991
0.0754
310
350
405
270
300
345
305
350
410
300
2.4
0.5
-----
0.80
1.88
43.70
7562
0.0601
450
385
465
* If required, Cables can be made with stranded conductor also.
23
TABLE - 12
IS: 1554
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED
GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED.
PART - I
CABLE CODE - YWY/YFY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Sq. mm
mm
4*
ARMOUR
Minimum
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Approx.
Weight
of Cables
Max. DC
Conductor
Resistance
0
AT 20 C
Direct
in ground
In
Duct
In
Air
Current Ratings
Galvanised
Round
Steel Wire
Nominal
Diameter
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
mm
mm
mm
mm
Kg./Km
Ohm/Km
Amps.
Amps.
Amps.
1.0
0.3
1.40
-----
1.24
15.2
660
4.61
36
30
30
6*
10
16
1.0
1.0
1.0
0.3
0.3
0.3
1.40
1.40
-----
--------0.80
1.24
1.40
1.40
16.4
18.2
17.8
740
970
1080
3.08
1.83
1.15
45
60
77
38
50
64
39
52
66
25
35
50
1.2
1.2
1.4
0.3
0.3
0.3
-------------
0.80
0.80
0.80
1.40
1.40
1.40
20.8
22.8
26.0
1390
1700
2250
0.727
0.524
0.387
99
120
145
81
99
125
90
110
135
70
95
120
1.4
1.6
1.6
0.3
0.4
0.5
-------------
0.80
0.80
0.80
1.56
1.56
1.56
29.2
33.2
35.7
3000
3900
4700
0.268
0.193
0.153
175
210
240
150
175
195
165
200
230
150
185
240
1.8
2.0
2.2
0.5
0.6
0.6
-------------
0.80
0.80
0.80
1.72
1.72
1.88
39.6
43.5
48.7
5700
6900
8700
0.124
0.0991
0.0754
270
300
345
225
255
295
265
305
355
300
2.4
0.6
-----
0.80
2.04
54.0
10700
0.0601
385
335
400
* If required, Cables can be made with stranded conductor also.
24
TABLE - 13
IS: 1554
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
Nominal
Thickness
of Insulation
Minimum
Thickness
of Inner
Sheath
ARMOUR
Galv.
Flat
Steel Strip
Nominal
Thickness
Minimum
Thickness
of Outer
Sheath
Approx
Overall
Diameter
PART - I
Approx
Weight
of Cables
Main
Neutral
mm
mm
mm
mm
mm
mm
kg/km
Max. DC Conductor
0
Resistance at 20 C
Current Ratings
Main
Neutral
Direct in
Ground
In
Ducts
In
Air
Ohm/km
Ohm/km
Amps
Amps
Amps
25
16
1.2
1.0
0.3
0.8
1.4
23.0
1610
0.727
1.150
99
81
90
35
16
1.2
1.0
0.3
0.8
1.4
25.3
1970
0.524
1.150
120
99
110
50
25
1.4
1.2
0.3
0.8
1.56
29.5
2680
0.387
0.727
145
125
135
70
35
1.4
1.2
0.4
0.8
1.56
32.8
3520
0.268
0.524
175
150
165
95
50
1.6
1.4
0.4
0.8
1.56
37.2
4425
0.193
0.387
210
175
200
120
70
1.6
1.4
0.5
0.8
1.72
40.5
5540
0.153
0.268
240
195
230
150
70
1.8
1.4
0.5
0.8
1.88
45.0
6570
0.124
0.268
270
225
265
185
95
2.0
1.6
0.5
0.8
2.04
49.5
8020
0.0991
0.193
300
255
305
240
120
2.2
1.6
0.6
0.8
2.20
55.6
10200
0.0754
0.153
345
295
355
300
150
2.4
1.8
0.6
0.8
2.36
61.5
12500
0.0601
0.124
385
335
400
25
TABLE - 14
IS: 1554
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: COPPER CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED
GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED.
PART - I
CABLE CODE - YWY/YFY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Sq. mm
mm
4*
ARMOUR
Minimum
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Approx.
Weight
of Cables
Max. DC
Conductor
Resistance
0
AT 20 C
Direct
in ground
In
Duct
In
Air
Current Ratings
Galvanised
Round
Steel Wire
Nominal
Diameter
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
mm
mm
mm
mm
Kg./Km
Ohm/Km
Amps.
Amps.
Amps.
1.0
0.3
1.40
-----
1.24
16.3
749
4.61
36
30
30
6*
10
16
1.0
1.0
1.0
0.3
0.3
0.3
1.40
---------
----0.80
0.80
1.24
1.40
1.40
17.6
18.4
20.8
878
1050
1275
3.08
1.83
1.15
45
60
77
38
50
64
39
52
60
25
35
50
1.2
1.2
1.4
0.3
0.3
0.3
-------------
0.80
0.80
0.80
1.40
1.40
1.56
24.5
27.0
31.8
1748
2350
3040
0.727
0.524
0.387
99
120
145
81
99
125
90
110
135
70
95
120
1.4
1.6
1.6
0.3
0.4
0.5
-------------
0.80
0.80
0.80
1.56
1.72
1.88
35.4
40.0
44.0
3930
5050
6240
0.268
0.193
0.153
175
210
240
150
175
195
165
200
230
150
185
240
1.8
2.0
2.2
0.5
0.6
0.6
-------------
0.80
0.80
0.80
1.88
2.04
2.36
48.5
53.9
60.6
7363
8122
11424
0.124
0.0991
0.0754
270
300
345
225
255
295
265
305
355
300
2.4
0.7
-----
0.80
2.52
2.52
16680
0.0470
385
335
400
* If required, Cables can be made with stranded conductor also.
26
TABLE - 15
IS: 1554
TYPE - SINGLE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION & OVERALL PVC SHEATHED
CABLE CODE - AYY
PART - I
Nominal
Cross
Sectional
Area
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
500.0
630.0
800.0
1000.0
Nominal
Thickness
of
Insulation
mm
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
Nominal
Thickness
of Outer
Sheath
mm
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
Approx.
Overall
Diameter
mm
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
Approx.
Weight
of
Cables
mm
Current Ratings
Max. DC
Conductor
Resistance
AT 20 C
Direct in ground
Direct in Duct
2 Cables
Amps.
Cables
Amps.
2 Cables
Amps.
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
3 Cables
Amps.
Direct in Air
2 Cables
Amps.
3 Cables
Amps.
Ohm/Km
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
* If required, Cables can be made with stranded conductor also.
27
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
TABLE - 16
IS: 1554
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, OVERALL PVC SHEATHED
PART - I
CABLE CODE - AYY
Current Ratings
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Approx.
Weight
of Cables
Max. DC
Conductor
Resistance
AT 20 C
Direct
in ground
In
Duct
In
Air
Sq. mm
mm
mm
mm
mm
Kg./Km
Ohm/Km
Amps.
Amps.
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
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
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
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
* If required, Cables can be made with stranded conductor also.
28
TABLE - 17
IS: 1554
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, OVERALL PVC SHEATHED
PART - I
CABLE CODE - AYY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Sq. mm
mm
mm
mm
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
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
Approx.
Weight
of Cables
Kg./Km
160
221
320
400
420
440
630
710
900
1200
1650
1950
2400
2750
3500
4350
5500
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
* If required, Cables can be made with stranded conductor also.
29
Current Ratings
Max. DC
Conductor
Resistance
AT 20 C
Direct
in ground
Ohm/Km
Amps.
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
In
In
Duct
Air
Amps.
Amps.
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 - 18
IS: 1554
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
Nominal
Thickness
of Insulation
Main
Nominal
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx
Overall
Diameter
Approx
Weight
of Cables
PART - I
Max. DC Conductor
0
Resistance at 20 C
Current Ratings
Main
Neutral
Direct in
Ground
In
Ducts
In
Air
Amps
Amps
Amps
Neutral
mm
mm
mm
mm
mm
kg/km
Ohm/km
Ohm/km
16
1.2
1.0
0.3
2.00
23.90
750
1.200
1.91
76
63
70
35
16
1.2
1.0
0.3
2.00
26.20
850
0.868
1.91
92
77
86
50
25
1.4
1.2
0.3
2.20
29.50
1150
0.641
1.20
110
95
105
70
35
1.4
1.2
0.4
2.20
33.50
1500
0.443
0.868
135
115
130
95
50
1.6
1.4
0.4
2.20
37.20
1900
0.320
0.641
165
140
155
120
70
1.6
1.4
0.5
2.40
41.20
2300
0.253
0.443
185
155
180
150
70
1.8
1.4
0.5
2.40
43.80
2800
0.206
0.443
210
175
205
185
95
2.0
1.6
0.5
2.60
47.70
3400
0.164
0.320
235
200
240
240
120
2.2
1.6
0.6
3.00
56.60
4244
0.125
0.253
275
235
280
300
150
2.4
1.8
0.6
3.20
62.50
5176
0.100
0.206
305
260
315
400
185
2.6
2.0
0.7
3.40
69.80
6700
0.0778
0.164
335
290
375
Sq. mm.
Sq. mm
25
30
TABLE - 19
IS: 1554
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER SHEATHED,
& OVERALL PVC SHEATHED CABLE CODE - AYY
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Nominal
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Approx.
Weight
of Cables
Sq. mm
mm
mm
mm
mm
Kg./Km
1.5*
2.5*
4*
0.8
0.9
1.0
0.3
0.3
0.3
1.8
1.8
1.8
11.7
13.1
14.8
6*
10*
16
1.0
1.0
1.0
0.3
0.3
0.3
1.8
1.8
2.0
25
35
50
1.2
1.2
1.4
0.3
0.3
0.3
70
95
120
1.4
1.6
1.6
150
185
240
300
400
PART - I
Max. DC
Conductor
Resistance
0
AT 20 C
Current Ratings
Direct
in ground
In
Duct
In
Air
Ohm/Km
Amps.
Amps.
Amps.
180
225
269
18.10
12.10
7.41
16
21
28
14
18
23
13
18
23
16.0
17.9
20.3
340
460
550
4.61
3.08
1.91
35
46
60
30
39
50
30
40
51
2.0
2.0
2.2
23.9
26.0
30.1
800
980
1300
1.20
0.868
0.641
76
92
110
63
77
95
70
86
105
0.4
0.4
0.5
2.2
2.2
2.4
33.9
38.6
42.5
1700
2100
2600
0.443
0.320
0.253
135
165
185
115
140
155
130
155
180
1.8
2.0
2.2
0.5
0.6
0.6
2.6
2.8
3.0
47.0
52.2
58.9
3200
3900
4900
0.206
0.164
0.125
210
235
275
175
200
235
205
240
280
2.4
2.6
0.7
0.7
3.2
3.6
65.3
72.9
6000
8000
0.100
0.0778
305
335
260
290
315
375
* If required, Cables can be made with stranded conductor also.
31
TABLE - 20
IS: 1554
TYPE - TWO CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED
PART - I
CABLE CODE - AYWY/AYFY.
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
ARMOUR
Galvanised
Galvanised
Rond
Flat
Steel Wire
Steel Strip
Nominal
Nominal
Diameter
Thickness
Minimum
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
Sq. mm
mm
mm
mm
mm
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
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
mm
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
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
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
* If required, Cables can be made with stranded conductor also.
32
Approx.
Weight
of Cables
Kg/Km
400
425
535
580
700
720
760
900
1040
1255
1595
1835
2140
2640
3200
3850
4700
Current Ratings
Max. DC
Conductor
Resistance
0
AT 20 C
Direct
in ground
Ohm/Km
Amps.
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
In
In
Duct
Air
Amps.
Amps.
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
TABLE - 21
IS: 1554
TYPE - THREE CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED
PART - I
CABLE CODE - AYWY/AYFY.
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
ARMOUR
Galvanised
Galvanised
Flat
Rond
Steel Strip
Steel Wire
Nominal
Nominal
Thickness
Diameter
Sq. mm
mm
mm
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
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
------------
mm
-----0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
Minimum
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
mm
mm
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
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
* If required, Cables can be made with stranded conductor also.
33
Approx.
Weight
of Cables
Kg./Km
440
500
580
620
750
780
920
1050
1300
1700
2100
2500
2900
3450
4250
5150
6600
Current Ratings
Max. DC
Conductor
Resistance
AT 20 C
Direct
in ground
Ohm/Km
Amps.
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
In
In
Duct
Air
Amps.
Amps.
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
TABLE - 22
IS: 1554
TYPE - THREE & HALF CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI STRIP ARMOURED & OVERALL PVC SHEATHED
PART - I
CABLE CODE - AYFY.
Nominal Cross
Sectional Area
Nominal Thickness
of Insulation
Main
Neutral
Main
Neutral
Sq. mm.
Sq. mm.
Sq. mm.
Sq. mm.
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
Minimum
Thickness
of Inner
Sheath
mm
0.3
0.3
0.3
0.4
0.4
0.4
0.5
0.5
0.6
0.6
0.7
ARMOUR
Galvanised
Flat
Steel Strip
Nominal
Thickness
Minimum
Thickness
of Outer
Sheath
mm
mm
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
Approx.
Overall
Diameter
mm
23.0
25.3
29.5
32.8
37.2
40.5
45.0
49.5
55.6
61.5
69.5
34
Approx.
Weight
of Cables
Current Ratings
Max. DC Conductor
Resistance AT 20° C
Main
Neutral
Kg./Km
Ohm/Km
Ohm./Km
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
Direct
in ground
In
In
Duct
Air
Amps.
Amps.
Amps.
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
TABLE - 23
IS: 1554
TYPE - FOUR CORE, VOLTAGE - 1100 VOLTS
CONSTRUCTION: ALUMINIUM CONDUCTOR, PVC INSULATION, PVC INNER
SHEATHED, GI WIRE/STRIP ARMOURED & OVERALL PVC SHEATHED
PART - I
CABLE CODE - AYWY/AYFY.
Nominal
Cross
Sectional
Area
Nominal
Thickness
of
Insulation
Minimum
Thickness
of Inner
Sheath
Sq. mm
mm
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
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
ARMOUR
Galvanised
Rond
Steel Wire
Nominal
Diameter
Galvanised
Flat
Steel Strip
Nominal
Thickness
mm
mm
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
* If required, Cables can be made with stranded conductor also.
Minimum
Thickness
of Outer
Sheath
Approx.
Overall
Diameter
mm
mm
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
Approx.
Weight
of Cables
Max. DC
Conductor
Resistance
Current Ratings
Direct
in ground
In Duct
In Air
Amps.
Amps.
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
AT 20° C
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
35
Kg./Km
Ohm/Km
Amps.
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
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.
2.
3.
4.
5.
6.
Max. Conductor Temperature
Ground temperature
AmbientTemperature
ThermalResistivityofSoil
ThermalResistivityofPVCCompound
Depth ofLaying[To highest point of
cable laid direct in ground or to top surface of ducts]
0
70 C
0
30 C.
0
40 C.
1500C.Cm/W.
6500C.Cm/W.
750C
6. MethodOfInstallation:
Cable Type
Type of Installation
Method of Installation.
Single Core Cable
I]
1. Three cables in closed
trefoil formation, or
2. Two touching in
horizontal formation
Laid direct in ground
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 a vertical wall.
Twin & Multi core Cables
7. SIZEOFDUCT
Installed Singly.
InnerDiameterofduct
100mm/125mm.
8. EFFECT OF GROUPING OF THE CABLES IN AIR - When more than one cable circuit are run simutaneously, there is no
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:
36.
RATING FACTORS
A) CABLE LAID DIRECT IN GROUND :DEPTH OF LAYING
DEPTH OF LAYING
CMS.
SQ.MM.
75
90
105
120
150
180 OR MORE
ii)
iii)
SIZE
ABOVE 25
SQ.MM.
UPTO 300 SQ. MM.
UPTO 25.0
SQ.MM.
1.00
0.99
0.98
0.97
0.96
0.95
ABOVE 300
SQ.MM.
1.00
0.98
0.97
0.96
0.94
0.94
1.00
0.97
0.96
0.95
0.92
0.91
FORVARIATIONINGROUNDTEMPERATURE (FOR CABLES LAID DIRECT IN GROUND)
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
FORGROUPRATINGFACTORS.
a) GROUPRATINGFACTORSFORTWINANDMULTICORECABLESIN
HORIZENTALFORMATION,LAIDDIRECTIN THE GROUND
Numbers
1.0
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.
0.9
GROUP RATING FACTOR
i)
0.8
0.7
0.6
0.5
0.4
1
2
3 4 5 6 7 8 9 10 11 12
NUMBER OF CABLES IN GROUP
GROUPRATINGFACTORSFORTWINANDMULTICORECABLESIN
TIERFORMATION,LAIDDIRECTIN THE GROUND
2
3
4
5
6
7
8
9
10
11
12
TOUCHING
15 CM.
30 CMS.
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
1
1
2
2
2
3
3
3
4
4
4
45 CMS. 60 CMS.
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
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
0.92
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
2
3
4
5
6
7
8
9
10
11
12
15 CM.
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
30 CMS. 45 CMS.
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
0.5
NUMBER OF CIRCUITS IN GROUP
0.9
0.8
0.7
0.6
0.5
1 2 3 4 5 6 7 8 9 10 11 12
NUMBER OF CIRCUITS (OF THO CABLES) IN GROUP
1.0
SPACING OF GROUPS OF CABLES (CENTRE TO CENTRE)
TOUCHING
0.6
0.4
GROUPRATINGFACTORSFORCIRCUITOFTHREESINGLECORE
CABLESINTREFOILANDTOUCHING,HORIZENTALFORMATION,
LAIDDIRECTINGROUND
No. of
CABLES
0.7
1.0
30 CMS. 45 CMS. 60 CMS.
0.90
0.85
0.81
0.79
0.77
0.76
0.75
0.74
0.74
0.73
0.73
0.8
1 2 3 4 5 6 7 8 9 10 11 12
SPACING OF GROUPS OF CABLES (CENTRE TO CENTRE)
TOUCHING 15 CM.
0.9
0.4
GROUPRATINGFACTORSFOR CIRCUIT OF TWOSINGLECORECABLES
SIDEBYSIDE TOUCHING,HORIZENTALFORMATION,LAIDDIRECTIN THE GROUND
No. of
CABLES
D)
1.0
SPACING OF CABLES (CENTE TO CENTRE)
GROUP RATING FACTOR
c)
No. of
TIERS
GROUP RATING FACTOR
No. of
CABLES
60 CMS.
0.89
0.83
0.80
0.77
0.75
0.74
0.73
0.73
0.72
0.72
0.71
GROUP RATING FACTOR
B)
0.9
0.8
0.7
0.6
0.5
0.4
1 2 3 4 5 6 7 8 9 10 11 12
NUMBER OF CABLES IN GROUP
(OF THREE CABLES)
38.
iv)
FORVARIATIONINTHERMALRESISTIVITYOFSOIL
a) RATING FACTOR FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
[TWIN&MULTICORECABLESLAIDDIRECTINGROUND]
0
Nominal
Area
of
Conductor
in Sq. mm.
FOR VALUE OF THERMAL RESISTIVITY OF SOIL IN C m/W
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
120
150
200
250
300
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
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.
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
Two Cables Touching, For Value of
0
Thermal Resistivity of Soil C cm/W
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
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
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
Three Cables in Trefoil Touching, for
0
Value of Thermal Resistivity of Soil Soil C cm/W
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
39.
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
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
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
0.82
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
0.76
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
B) CABLE INSTALLED IN DUCT :i) RATING FACTOR FOR DEPTH OF LAYING
(TWIN & MULTICORE CABLES IN SINGLE WAY DUCTS)
DEPTH OF LAYING
[CM.]
RATING FACTOR
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
ii) FOR VARIATION IN GROUND TEMPERATURE
[FOR CABLES IN DUCTS]
GROUND TEMPERATURE
IN DEGREE C
RATING FACTOR
15
20
25
30
35
40
45
1.17
1.12
1.06
1.00
0.94
0.87
0.79
iii) FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
a) RATING FACTOR FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
(TWIN & MULTICORE CABLES SINGLE WAY DUCT)
0
FOR VALUE OF THERMAL RESISTIVITY OF SOIL IN C cm/W
Nominal
Area
of
Conductor
in Sq. mm.
100
150
250
200
250
300
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
40.
RATING FACTOR FOR VARIATION IN THERMAL RESISTIVITY OF SOIL
[TWO & THREE SINGLE CORE CABLES LAID DIRECT IN DUCTS]
Nominal
Area of
In Sq.mm.
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
iv)
Two Cables in two way ducts, For Value of
O
Thermal Resistivity of Soil C cm/W
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
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
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
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
Three Cables in Trefoil Ducts, For
O
Value of Thermal Resistivity of Soil C cm/W
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
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
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
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
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
0.94
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
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
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
RATING FACTORS FOR MULTIWAY DUCTS
(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
LOADED CABLES
1
2
4
5
7
8
RATING FACTOR
1.15
1.07
1.10
1.04
1.10
1.05
(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)
0.85
GROUP RATING FACTOR
b)
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0
41.
100
200
300
400
500
SIZE OF CONDUCTOR IN SQ mm.
600
RATING FACTOR FOR DUCTS IN TIER FORMATION
a)
GROUP RATING FACTORS FOR TWIN & MULTICORE CABLES IN
SINGLEWAY STONEWARE DUCTS AND IRON PIPES IN TIER
FORMATION [Formation of Ducts (Pipes)]
Spacing of
Ducts (Pipes)
SPACING
SPACING
Ducts (Pipes)
approximately
touching
30 cm
45 cm
b)
0.76
0.67
0.58
0.54
0.79
0.81
0.71
0.74
0.61
0.63
0.57
0.60
GROUP RATING FACTORS FOR SINGLE CORE CABLES IN TREFOIL
STONEWARE DUCTS IN TIER FORMATION
[Formation of Ducts]
Spacing
of
Ducts
SPACING
v)
SPACING
Ducts (Pipes)
approximately
touching
45 cm
0.76
0.70
0.64
0.61
0.78
0.75
0.67
0.64
C) CABLES INSTALLED IN AIR
i)
RATING FACTOR FOR VARIATION IN AMBIENT AIR TEMPERATURE :
AIR TEMPERATURE
IN DEGREE C
RATING FACTOR
ii)
25
30
35
1.25 1.16
40
1.09
45
1.00
0.90
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
UPTO & INCLUDING 185
240
300
400
500
2
RATING FACTOR
1.07
1.10
1.08
1.04
1.00
iii)
a)
RATING FACTOR FOR MULTICORE LAID ON RACK IN AIR
WITH SPACING BETWEEN CABLES EQUAL TO DIAMETER OF CABLE.
ARRANGEMENT
NO. OF
RACKS
NO. OF CABLES PER RACK
2
3
6
9
1.00
0.98
0.96
0.93
0.92
1.00
0.95
0.93
0.90
0.89
3
1.00
0.94
0.92
0.89
0.88
6
1.00
0.93
0.90
0.87
0.86
1
1
2
25 mm
b)
d
d
WITH CABLE TOUCHING
ARRANGEMENT
NO. OF
RACKS
NO. OF CABLES PER RACK
1
2
3
6
9
30 cm.
25 mm
43.
1
1.00
0.84
0.80
0.75
0.73
2
1.00
0.80
0.76
0.71
0.69
3
1.00
0.78
0.74
0.70
0.68
6
1.00
0.76
0.72
0.68
0.66
"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.
Short Circuit Rating
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
0
0
circuit current of high magnitude. Normally rated at 70 C,Ourinsulationmaterial permitashort circuittemperature 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 : DurationofShortCircuitinseconds.
A ; AreaofConductorinSq.mm.
K ; aConstant
ForAluminiumwithgeneralpurposePVCInsulationForCopperwithgeneralpurposePVCInsulationForAluminiumwithHeatResistingPVCInsulationForCopperwithHeatResistingPVCInsulation-
44.
0.0760
0.115
0.0686
0.104
SHORT CIRCUIT RATING
SHORT CIRCUIT RATING FOR ONE SECOND.
ALUMINIUM CONDUCTOR
CONDUCTOR
SIZE
WITH
GENERAL
PURPOSE
INSULATION
WITH
HEAT
RESISTING
INSULATION
COPPER CONDUCTOR
WITH
GENERAL
PURPOSE
INSULATION
WITH
HEAT
RESISTING
INSULATION
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 PHASE AC DISTRIBUTION SYSTEM:VoltageDrop[rms]PerKm.PerPhase[volts]
= 3 x K T x K AC
X [Max. Continuous Current Rating]
X [D.C. Resistance Per phase Per Km.(Ohm/Km.)]
Where
KT =
1+a[TC- To]
a =
a =
TC =
To =
0.00393 for Copper
0.004
for Aluminium
Max. Conductor Resistance [Degree C]
20 Degree C Standard Temperature.
KAC= Factor For Converting DC Resistance to AC Resistance.
APPROXIMATE VALUES OF KAC FOR 1100 VOLTS CABLES ARE GIVEN BELOW:NOMINAL
CONDUCTOR AREA
IN SQ.MM.
COPPER
CONDUCTOR
ALUMINIUM
CONDUCTOR
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
46.
Recommendations For Storage & Installation Of Cables
For easy and convenient installation conditions and desired performance, following
recommendation are made:
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 damaged.
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)
0
Avoid excessively high temperature when sealing of the cable joint of cable. Cool the sealing to avoid 100 C
beforepuring.
xii)
The cable should be paid off from the top of the cable drum, held in the normal position. Sufficient care should
betakentoprevent twists,accutebendsetc.whilelaying.
xiii)
Thedispositionofcablesupportitsspacingshouldbesuch,astopreventunduestrainordamagetothecable.
xiv)
TheminimumBendingRadiusforCablesshouldnotbelessthanthevaluesshown.
Wherererpossible25%highervalueshouldbeadopted.
i) 8XDiamerterforSingleCoreCable. ii) 12XDiameterformultiCoreCable
xv)
MaximumPullingTensionduringInstallation:
-
CablehavingAluminiumConductor
-30N.Sq.mm.Max.
CablehavingCopperConductor
-50N.Sq.mm.Max.
47.
RECOMMENDED "PAGODA" CABLE SIZES
FOR MOTORS WITH START-DELTA STARTER
RECOMMENDED "PAGODA" CABLE SIZES
FOR MOTORS WITH DOL STARTERS
Typical Cable Size Aluminium
Typical Cable Size Copper
3 Phase
415 V
HP
415 V
50Hz
KW
Approx.
full load
current in
Amps
Phase
Current
in Amps
Supply
Side
Motor
Side
Supply
Side
Motor
Side
3
5
7.5
10
2.2
3.75
5.50
7.50
5
7.5
11
14
2.88
4.32
6.34
8.10
1.5/2.5
1.5/2.5
2.5/4
4
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
1.5/1.5
1.5/1.5
1.5/1.5
2.5
12.5
15
20
25
9.30
11.0
15.0
18.50
18
21
28
35
10.02
12.10
16.0
20.20
4
6
10
16
2.5
2.5
4
6
30
35
40
45
22.0
26.0
30.0
33.5
40
47
55
60
23.0
27.0
30.30
34.6
16
25
25
35
50
60
65
70
37.0
44.0
48.5
52
66
80
87
94
35.0
45.0
50
54
75
90
100
125
55
67.5
75.0
90
100
120
135
165
150
175
200
240
110
132
150
175
250
275
300
400
187.5
204
225
300
3 Phase
415 v
50Hz
HP
415 V,
50Hz
KW
Approx
full load
current in
Amps
1.5/1.5
1.5/1.5
1.5/1.5
1.5/1.5
0.50
0.75
1.0
1.5
0.40
0.55
0.75
1.1
2.5
4
6
10
1.5
1.5
2.5
4
2.0
3.0
4.0
5.0
6
10
16
16
10
16
16
25
4
6
10
10
35
50
70
70
16
25
35
35
25
35
50
50
57.5
69
78
95
70
95
95
120
35
50
50
70
200
230
275
320
115
133
159
184.50
185
240
300/400
300/400
323
360
385
500
185
206
222
300
400
500
500
630
Typical Cable Size
Aluminium
(sq. mm.)
Copper
(sq. mm.)
1.2
1.6
1.8
2.6
1.5/2.5
1.5/2.5
1.5/2.5
1.5/2.5
1.5
1.5
1.5
1.5
1.5
2.2
3.0
3.75
3.5
5
6.2
7.5
1.5/2.5
1.5/2.5
1.5/2.5
2.5
1.5
1.5
1.5
1.5
6.0
7.5
10
12.5
4.5
5.5
7.5
9.3
9
11
14
18
2.5
4
4
6
1.5
2.5
2.5
4
10
16
25
25
15
17.5
20
25
11
13
15
18.5
21
24
28
35
6
10
10
16
4
6
6
10
50
70
70
95
25
35
35
50
30
35
40
45
22
26
30
33.50
40
47
55
60
25
25
25
35
16
16
16
25
70
120
150
185
120
185
240/300
240/300
50
95
120
150
50
60
75
90
37
44
55
67.5
66
80
100
120
35
50
70
95
25
35
50
70
185
185
240
300/400
240/300
300/400
300/400
400/500
150
150
185
240/300
100
150
200
225
75
110
150
168
135
150
175
200
95
185
300/400
300/400
70
150
240/300
240/300
CURRENT FOR A/C MOTORS
Approx. Amps per phase taken by modern induction motors, allowing reasonable efficiencies and power factors
B.H.P.
of
Motor
230 Volts
400 Volts
1/8
1/4
1/2
3/4
1.0
1.8
3.5
4.8
0.6
1.1
2.0
3.0
0.6
1.3
2.5
3.3
1
1
1
1
6.2
7.4
8.7
10.0
4.0
4.8
5.7
6.3
2
2
3
4
5
7
10
12
15
20
30
40
50
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.
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
Single Phase
Two Phase
230 Volts
Three Phase
400 Volts
346 Volts
400 Volts
440 Volts
500 Volts
0.3
0.7
1.2
1.5
0.4
0.8
1.5
1.9
0.3
0.7
1.2
1.7
0
0.6
1.0
0.3
0.6
1.0
1.3
4.0
4.8
5.5
6.8
2.0
2.5
3.0
3.2
2.2
2.7
3.0
3.5
2.0
2.5
2.8
3.2
1.7
2.2
2.5
2.8
1.5
1.9
2.2
2.5
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
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
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
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
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
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
49.
CONVERSION TABLE
Multiplier
Constant
Reciprocal
of 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
0.0254
2.54
0.9144
1.6093
645.16
5.06.7 x 10-6
0.7854 x 10-6
0.08361
39.37
0.3937
1.0936
0.6214
0.00155
1937.5
1.273 x 106
1.196
Pounds to Kilogrammes
Tons (2240 lbs.) to Kilogrammes
Cwt. to Kilogrammes
0.4536
1016.02
50.8
2.2910
0.00098
0.01968
Ounces (Avolr) to Grammes
Gallons (Imp.) to Litres
Gallons (Imp.) to Cubic Inches
28.35
4.546
277.42
0.0353
0.22
0.003604
lbs./1000 Yards to lbs./Mile
lbs./1000 Yards to-gm./Km.
2
lbs./Sq. Inch to-gm./mm
1.76
0.4961
-6
703 x 10
0.568
2.016
1422.33
Ohms/1000 Yards to Ohms/Mile
OHms/1000 Yards to Ohms/Km
1.76
1.0936
0.568
0.9144
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.
33000
0.746
76.0
44.24
0.1
30.10
1.34
0.01316
0.022
10.0
Miles/Hour to Ft./Min.
Meters/Sec. to Ft./Min.
Land Miles to Nautical Miles
88.0
197.0
0.868
0.01134
0.00508
1.151
Temperature : 0F to 0C : Subtract 32 and Multiply by 5/9;
50.
0
-6
C to 0F : Multiply by 9/5 and add 32.
GLOSSARY OF TERMS
A
:
Ampere
AC
:
Alternating Current
ABRASION :
RESISTANCE
Ability of a Wire or Cable to resist surface wear.
ALLOY
:
A Combination of two or more different polymers or metal. Usually combined to
make use of different properties of each polymer or metal.
ACCELERATED
AGEING
:
A test that simulates long time environmental condition in a relatively short time.
AMBIENT
:
Condition existing at a test or operating location prior to to energizing
equipments.
ALTERNATING
CURRENT[A.C.]
:
Electric Current that alternates or reverses polarity continuously. The numbers
of alternations per seconds are called as "Cycles" [Hertz or Hz.]
AMPERE
:
A standard unit of current and is defined as the amount of current that flows when
One 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.
ANNEAL
:
To soften and relieve strains in any solid material such as metal by heating to
just below its melting point and then slowly cooling it . Annealing generally
lowers the tensile strength of the material, while improving its elongation and
flexibility.
BENDING RADIUS
:
Radius of curvature that a cable can bend without any adverse effect.
BREAKDOWN
VOLTAGE
:
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 to
another.
BUNCH STRAND
:
Conductors twisted together with same lay and direction.
CAPACITIVE
REACTANCE
:
The opposition of alternating current due to capacitance of a capacitor or cable. It
is measured in Ohms.
CAPACITANCE
:
The ability of dielectric or insulation material between the conductors to store
energy when a difference of potential exists between conductors. The unit of
Capacitance is Farads. Cable Capacitance is usually measured in Picofarads [pF]
Per Mtr.
COLOR CODE
:
A system of different colours used to identify the components of cables such as
Conductor or group of conductors.
CONCENTRIC
STRANDING
:
A group of uninsulated wired twisted together and containing a center core with
the subsequent layers spirally wrapped around the core with alternating lay
direction to form a single conductor.
CONDUCTIVITY
:
The ability of a material to allow electrons to flow, measured by current per unit
of voltage applied. It is the reciprocal of resistivity.
CONDUIT
:
A tube of metal or Plastic through which wire or cable can be run, used to protect
51.
the wire or cable from surroundings.
CONDUCTOR
:
A Substance, usually metal Copper or Aluminium, used to transfer electrical
energy from point to point.
CORD
:
A very flexible insulated Cable.
CURRENT LOOP
:
A two wire transmit/receive interface.
DC
:
Direct Current.
DIRECT CURRENT
:
Electric Current that flows in one direction only.
DIELECTRIC
:
An Insulating [ non conducting] medium when used in signal carrying design.
DIELECTRIC LOSS
:
The Power dissipation in a dielectric as the result of friction produced by
molecular motion when an alternating field is applied.
DIELECTRIC
STRENGTH
:
The voltage which an insulation can withstand before it break down.
DIELECTRIC
:
A number which indicates the quality of a material to resist holding an electrical
charge when placed between two conductors. It is based on a vacuum, which has
dielectric constant of 1.
CONSTANT
:
motion when an alternating field is applied.
ELECTROSTATIC
:
Pertaining to static electricity, or electricity at rest.
EMF
:
Electromotive Force [Voltage]
ENERGY
:
The Capacity of doing work.
ENERGY
DISSIPATION
:
Loss of energy from a system due to conversion of work energy into undesirable
form usually heat. Dissipation of Electric Energy occurs when current flows
through a resistance.
ELONGATION
:
The increase in length of a wire or cable caused by longitudinal tension.
FARADS
:
A unit of capacity that will store one coulomb of electrical charge when one volt
of electrical pressure is applied.
FERROUS
:
Composed of and/or containg iron. A ferrous metal exhibits magnetic
characterstics.
FLAME RESISTANCE
:
The ability of a material not to fuel a flame once the source of heat is removed.
FLEXIBILITY :
The ability of a cable to bend in a short radius.
FRLS
:
Flame Retardent Low Smoke.
FREQUENCY
:
The number of times a periodic actions occurs in one second.
GROUND
:
An electrical connection between the circuit and earth.
I
:
Symbol used to designate current.
52.
IMPEDANCE
:
The total opposition that a circuit offers to flow the alternating current or any
other varying current at a particular frequency.
INDUCTANCE
:
The property of a wire which store electrical current in a magnetic field around
the wire. It is measured in Henrys.
INSULATION
:
A material having good dielectric properties which is used to separate the
conductor from surroundings.
IR DROP
:
The designation of voltage drop in term of current and resistance.
LAY
:
The length measured along the axis of wire required for a single strand to make
one 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 around
each other.
LAY DIRECTION
:
The direction of progreesive spiral twist in a cable while looking along the axis of
the cable away from the observer. The lay direction can be left or right.
LEAKAGE
:
The undesirable passage of current over the surface of or through an insulator.
KILO
:
One Thousand [ 10 ]
KV
:
Kilo Volts [ 1000 Volts.]
KVA
:
Kilo Volt Ampere.
KW
:
Kilo Watt.
mA
:
Milli Ampere.
MEGA
:
Prefix Meaning Million.
MHO
:
Unit of Conductance equal to reciprocal of unit of resistance [Ohm].
MICRO
:
Prefix meaning of One - millionth [ 10 ]
MICRON
:
Millionth of a Meter.
MIL
:
A unit of length equal to one thousand of an Inch.
MILLI
:
Prefix meaning One-thousandth [ 10 ].
mV
:
Milli Volt.
mW
:
Milli Watt.
NANO
:
One Billionth.
NOISE
:
In a Cable or circuit, any extraneous signal which tends to interfere with the
signal normally present in or passing through the system.
PEAK
:
The maximum instantaneous value of a vaying current or voltage.
3
-6
-3
53.
POWER
:
The amount of work per unit of time. It is expressed in Watts.
POWER LOSS
:
RATED
TEMPERATURE
:
The difference between the total power delivered to a circuit or cable and power
delivered by the circuit or cable.
The maximum temperature at which an electric component can operate for
extended period without loss of its basic properties.
RATED VOLTAGE
:
The maximum voltage at which an electric component can operate for extended
period without undue degration or safety hazards.
REACTANCE
:
A measure of combined effect of capacitance and inductance on an alternating
current. The amount of such opposition varies with the frequency of current.
RESISTANCE [DC]
:
The opposition offered by a material to flow of current. It is expressed in Ohms.
RESISTANCE [AC]
:
The total opposition that a circuit offers to the flow of alternating current. It is the
total effect of resistance, Inductance & Capacitance. It is expressed in Ohms.
RMS
:
Root Mean Square.
PVC
:
Poly Vinyl Chloride.
STRAND
:
A Single Uninsulated Wire.
STRANDED
CONDUCTOR
:
A Conductor composed of groups of uninsulated wires.
SHEATH
:
Pertaining to Twisted Insulated Conductors , the outer protection covering.
THERMAL RATING
:
The Temperature in which a material will perform its function without undue
Degration.
TENSILE STENGTH
:
The pull stress required to break a bare wire or insulation.
TRANSMISSION LINE
:
An arrangement of two or more conductors used to transfer signal energy from
one location to another.
V
:
Volts.
VOLTAGE
:
Electrical Potential or electromotive force expressed in volts.
VOLTAGE DROP
:
A Voltage loss occurring between any two points in a power transmission line.
Such drop, Resistance, Reactance & leakage of the line.
VOLTAGE RATING
:
The highest rating that may be continuously applied to a cable construction in
conformance with the standard or specification.
VSWR
:
Abbreviation for voltage standing wave ratio. It is the ratio of transferred signal
voltage as compared to reflected signal voltage measured along with the length of
transmission line.
WALL THICKNESS
:
The Thickness of Insulation or Sheath.
WATT
:
The unit of electrical Power.
54.