Company Introduction

ZMS Cable is the earliest private enterprise in Henan (China) cable business. Our cables are manufactured using the
most up-to-date technology. Modern production facilities are backed by a highly qualified work force and experienced
engineers, who ensure that only cable of the highest quality leaves our factories.

Cables are manufactured strictly in accordance with the appropriate GB (China) Standard Specifications and to IEC,
CE and UL standards and are approved by the relevant Classifications Institutions. Full traceability is maintained by
strict adherence to quality policies compliant with ISO9001/2, whilst environmental policies will be maintained by
compliance with ISO14001 in no time.

Nowadays we start to develop the overseas market, bases on an annual turnover in excess of 200m, and one of the
major suppliers to both the electrical wholesale trade power utility sector and civilian markets. Our product range
includes general building wires, data and telecommunications cables, industrial rubber cables, overhead conductors
together with power cables up to, and including, 40KV.

Our production back up guarantees a complete range of quality cables, supplied via our warehouse. We are also able
to arrange shipments directly from our factories where substantial back-up stocks are also held.

We offer an extensive product range, proven quality, our prices are competitive and our lead-time won't disappoint you.

ZMS sets high standards

ZMS Cables and Systems B.V. is certified in accordance with ISO9001Quality and ISO 14001 Environmental
Management System standards for its activities.

ZMS products are designed to comply with all major national and international standards(e.g. NEN, IEC,
CENELEC, BS, CEI, DIN VDE, ICEA,IRAM, NBR, NF, SABS, SFS, TSE, UNE, UTE, NBN,AEIC, ANSI, AS/NZS
etc.) and with customers specific requirements..

Innovation and quality

The objectives of ZMSs Research & Development function are identifying innovative products and technologies,
introducing new products onto the market services designed to expand the range on offer, and cutting production
costs.

The quality of ZMS products is assured by means of strict monitoring of all phases of the production process,
from raw material procurement to the delivered product, through a highly-developed control system for each
specific phase of the cycle.

The controls during the raw material procurement stage concern supplier selection and quality checks of the
individual supplies, which have to that they conform to the standards specified during the contractual phase.

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Cable Finishing

ZMS Cables and Systems B.V. offers a wide variety of cable based on customers requirements, which includes the
following:

Single core medium voltage utility cables

- Copper wires screen;
- Copper wires screen and laminated aluminum foil;
- Copper wires screen and laminated copper foil.
Three core medium voltage utility cable:
- Copper wires screen.

Single core industrial medium voltage cables

- Steel wire armoring;
- Steel tape armoring;
- Welded aluminum sheath;
- Aluminum wire armoring.

Three core industrial medium voltage cables

- Steel wire armoring;
- Steel tape armoring.

Apart from the standard PE outer sheath the

following optional finishing can be produced
by ZMS Cables and Systems B.V. as well:
- LSOH outer sheath;
- PVC outer sheath.

If you have more other specifications wishes concerning cable constructions and/or test regimes, please do not
hesitate to contact us, we will design for you.

Conductor Types and Range

The conductor sizes mentioned in the tables are commonly used types.
The maximum conductor size per material and type is as follows:
Copper: 1200 sqr.mm

The minimum conductor size per type and voltage class is as follows:
10kV and 30kV
Aluminum and copper conductor: 25 sqr.mm

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Test Regimes

As part of our quality system extensive tests are performed to guarantee our products fulfill the highest demands. Type
tests reveal our cable designs to be outstanding and routine and sample tests prove that our cables conform to the
highest stand.

Type Tests
ZMS Cables and Systems B.V. continuously perform type tests on MV cables according to the following
standard: IEC 60502-2.

Routine tests
Accordance with customer requirements, each cable length is subjected to a final routine testing procedure
based on IEC 60502 before release, consisting of:
- Measurement of the electrical resistance of the conductor.
- High voltage test.
- Partial discharge test.

Insulation quality and life expectancy of a cable are related to the magnitude of partial discharges that might occur in a
cable. The reliability of measuring results for these partial discharges greatly depends on the noise level caused by the
surrounding environment. The discharge detection limit is improved by using an electromagnetically shielded room
(Faradays-cage) for the execution of the partial discharge test.

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Manufacture Process

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Construction of Cables

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Single Core Medium Voltage Cables

10kV
Single Core Medium Voltage Cables
Constructional data:
Rated voltages: Uo/U /Um: 6/10/12 kV Nominal insulation thickness: 3.4 mm

Nominal cross section of the

conductor:
Alrm mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 1200

Alrs mm2 95 120 150 185 240 300 400 500 630 800 1000 1200

Curs mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 1200
Outer diameter stranded conductor
mm 25 27 29 30 32 34 36 38 42 45 49 53 57 61
(Aluminum or copper)
Outer diameter solid conductor
mm 25 26 28 29 31 32 35 37 40 43 47 50 53 56
(Aluminum only)
Net weight, aluminum conductor
kg/m 0.7 0.8 0.9 1 1.2 1.4 1.6 1.8 2.2 2.6 3.1 3.3 3.9 4.6
(stranded and solid)
Net weight, copper conductor
kg/m 1.1 1.3 1.6 1.9 2.2 2.6 3.2 3.8 4.8 5.9 7.2 10 12.3
(stranded only)
Minimum bending radius: during
m 0.5 0.55 0.61 0.65 0.7 0.75 0.82 0.88 0.98 1.07 1.19 1.32 1.45 1.56
laying (stranded conductors)
Minimum bending radius: installed
m 0.4 0.44 0.49 0.52 0.56 0.6 0.65 0.71 0.79 0.86 0.95 1.06 1.16 1.25
(stranded conductors)
Minimum bending radius: during
m 0.49 0.53 0.58 0.62 0.67 0.7 0.78 0.84 0.97 1.01 1.12 1.22 1.32 1.42
laying (solid aluminum conductors)
Minimum bending radius: installed
m 0.39 0.42 0.46 0.49 0.53 0.56 0.63 0.67 0.78 0.81 0.9 0.98 1.06 1.14
(solid aluminum conductors)
Electrical properties:

Approximate reactance per phase@50Hz

Trefoil touching /km 0.128 0.121 0.115 0.111 0.108 0.104 0.1 0.128 0.121 0.115 0.111 0.108 0.104 0.1

Trefoil ducts touching /km 0.231 0.22 0.209 0.202 0.194 0.187 0.179 0.231 0.22 0.209 0.202 0.194 0.187 0.179
Flat Touching /km 0.143 0.135 0.129 0.125 0.123 0.119 0.115 0.143 0.135 0.129 0.125 0.123 0.119 0.115
Flat Cables spaced /km 0.186 0.178 0.172 0.168 0.165 0.161 0.157 0.186 0.178 0.172 0.168 0.165 0.161 0.157
Flat Ducts touching /km 0.171 0.165 0.16 0.154 0.151 0.147 0.143 0.171 0.165 0.16 0.154 0.151 0.147 0.143
Operating capacitance@10kV and
F/km 0.26 0.29 0.32 0.35 0.38 0.41 0.46 0.26 0.29 0.32 0.35 0.38 0.41 0.46
50Hz

Charging current@10kV and 50Hz A/km 0.47 0.53 0.58 0.63 0.69 0.74 0.83 0.47 0.53 0.58 0.63 0.69 0.74 0.83

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15kV
Single Core Medium Voltage Cables
Constructional data:
Rated voltages: Uo/U
Nominal insulation thickness: 4.5 mm
/Um: 8.7/15/18kV
Nominal cross section of
the conductor:
Alrm mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 1200

Alrs mm2 95 120 150 185 240 300 400 500 630 800 1000 1200
Curs mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 -
Outer diameter stranded
conductor (Aluminum or mm 27 29 31 32 34 36 38 40 44 47 51 55 60 63
copper)
Outer diameter solid
conductor (Aluminum mm 27 28 30 31 33 34 37 39 42 45 49 52 55 59
only)
Net weight, aluminum
conductor (stranded kg/m 0.8 0.9 1 1.1 1.3 1.5 1.7 1.9 2.3 2.8 3.3 3.4 4.1 4.8
and solid)
Net weight, copper
conductor kg/m 1.2 1.4 1.7 2.0 2.3 2.7 3.3 3.9 4.9 6.1 7.4 10 13 -
(stranded only)
Minimum bending radius:
during laying (stranded m 0.53 0.58 0.64 0.68 0.73 0.78 0.85 0.91 1.01 1.1 1.22 1.36 1.48 1.59
conductors)
Minimum bending radius:
installed (stranded m 0.42 0.47 0.51 0.54 0.58 0.63 0.68 0.73 0.81 0.88 0.97 1.08 1.19 1.27
conductors)
Minimum bending radius:
during laying (solid m 0.52 0.56 0.61 0.65 0.7 0.73 0.81 0.87 0.96 1.04 1.15 1.24 1.35 1.45
aluminum conductors)
Minimum bending radius:
installed (solid m 0.42 0.45 0.49 0.52 0.56 0.59 0.65 0.7 0.76 0.84 0.92 0.99 1.08 1.16
aluminum conductors)
Electrical properties:

Approximate reactance per phase@50Hz

Trefoil touching /km 0.134 0.126 0.119 0.115 0.113 0.109 0.104 0.101 0.098 0.095 0.092 0.089 0.086 0.084

Trefoil ducts touching /km 0.231 0.220 0.210 0.203 0.094 0.187 0.179 0.172 0.163 0.156 0.148 0.140 0.132 0.125

Flat Touching /km 0.148 0.141 0.134 0.130 0.127 0.123 0.119 0.115 0.112 0.109 0.106 0.103 0.100 0.098

Flat Cables spaced /km 0.191 0.184 0.177 0.173 0.169 0.165 0.161 0.157 0.153 0.150 0.147 0.144 0.141 0.139

Flat Ducts touching /km 0.176 0.171 0.165 0.159 0.155 0.151 0.147 0.142 0.139 0.136 0.133 0.130 0.126 0.124
Operating capacitance
F/km 0.21 0.23 0.26 0.28 0.3 0.33 0.37 0.4 0.44 0.49 0.54 0.61 0.67 0.73
@15kV and 50Hz
Charging current
A/km 0.57 063 0.71 0.76 0.82 0.90 1.01 1.09 1.20 1.33 1.47 0.65 0.82 1.97
@15kV and 50Hz

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20kV
Single Core Medium Voltage Cables
Constructional data:
Rated voltages: Uo/U /Um:
12/20/24KV Nominal insulation thickness: 5..5 mm
Nominal cross section of the
conductor:

Alrm mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 1200
Alrs mm2 95 120 150 185 240 300 400 500 630 800 1000 1200
Curs mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 -

Outer diameter stranded conductor

(Aluminum or copper) mm 29 31 33 34 36 38 40 42 46 49 53 57 62 65
Outer diameter solid conductor
(Aluminum only) mm - - 32 33 35 36 39 41 43 47 51 54 57 61
Net weight, aluminum conductor
(stranded and solid) kg/m - - 1.1 1.2 1.4 1.6 1.8 2.1 2.5 3 3.5 3.6 4.3 5.0
Net weight, copper conductor
(stranded only) kg/m 1.3 1.5 1.8 2.1 2.4 2.8 3.4 4.0 5.0 6.2 7.6 10 13 -
Minimum bending radius: during
laying (stranded conductors) m 0.56 0.61 0.67 0.71 0.76 0.81 0.88 0.94 1.04 1.13 1.25 1.39 1.51 1.62
Minimum bending radius: installed
(stranded conductors) m 0.45 0.49 0.54 0.56 0.6 0.65 0.7 0.75 0.83 0.91 1.00 1.11 1.21 1.30
Minimum bending radius: during
laying (solid aluminum conductors) m - - 0.64 0.68 0.73 0.76 0.84 0.9 0.97 1.07 1.18 1.27 1.38 1.48
Minimum bending radius: installed
(solid aluminum conductors) m - - 0.51 0.54 0.58 0.51 0.67 0.72 0.78 0.86 0.95 1.02 1.11 1.19
Electrical properties:

Approximate reactance per phase@50Hz

Trefoil touching /km 0.138 0.13 0.124 0.119 0.117 0.112 0.108 0.104 0.101 0.097 0.094 0.091 0.088 0.086

Trefoil ducts touching /km 0.231 0.22 0.21 0.203 0.195 0.187 0.179 0.172 0.163 0.156 0.148 0.140 0.132 0.125

Flat Touching /km 0.153 0.145 0.138 0.134 0.131 0.127 0.122 0.118 0.115 0.112 0.109 0.106 0.103 0.101

Flat Cables spaced /km 0.196 0.188 0.181 0.177 0.173 0.169 0.164 0.161 0.156 0.153 0.15 0.147 0.144 0.142

Flat Ducts touching /km 0.181 0.175 0.169 0.163 0.159 0.155 0.150 0.146 0.142 0.139 0.136 0.133 0.129 0.127
Operating capacitance
F/km 0.138 0.13 0.124 0.119 0.117 0.112 0.108 0.104 0.101 0.097 0.094 0.091 0.088 0.086
@20kV and 50Hz
Charging current@20kV and 50Hz A/km 0.653 0.726 0.834 0.871 0.94 1.02 1.12 1.23 1.34 1.49 1.67 1.85 2.03 2.19

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30kV
Single Core Medium Voltage Cables
Constructional data:
Rated voltages: Uo/U /Um: 12/20/24KV Nominal insulation thickness: 5..5 mm

Nominal cross section of the conductor:

Alrm mm2 - - 150 185 240 300 400 500 630 800 1000 1200

Alrs mm2 95 120 150 185 240 300 400 500 630 800 1000 1200

Curs mm2 95 120 150 185 240 300 400 500 630 800 1000 -

Outer diameter stranded conductor (Aluminum or copper) mm 39 39 42 44 46 48 52 55 59 62 67 70

Outer diameter solid conductor (Aluminum only) mm - - 41 43 46 47 51 53 57 59 62 66

Net weight, aluminum conductor (stranded and solid) kg/m 1.2 1.3 1.8 2.0 2.2 2.6 3 3.4 3.9 4.0 4.7 5.4

Net weight, copper conductor (stranded only) kg/m 1.9 2.4 2.8 3.2 3.8 4.5 5.5 6.6 8.0 11 13 -
Minimum bending radius: during laying (stranded
m 0.76 0.78 0.85 0.9 0.97 1.03 1.13 1.22 1.34 1.46 1.59 1.70
conductors)

Minimum bending radius: installed (stranded conductors) m 0.60 0.62 0.68 0.72 0.77 0.83 0.91 0.98 1.07 1.17 1.27 1.36

Minimum bending radius: during laying

m - - 0.82 0.87 0.95 0.99 1.09 1.16 1.27 1.35 1.46 1.56
(solid aluminum conductors)
Minimum bending radius: installed
m - - 0.65 0.69 0.76 0.79 0.87 0.93 1.02 1.08 1.17 1.25
(solid aluminum conductors)

Electrical properties:

Approximate reactance per phase@50Hz

Trefoil touching /km 0.133 0.129 0.125 0.121 0.155 0.111 0.108 0.104 0.100 0.096 0.092 0.089

Trefoil ducts touching /km 0.211 0.203 0.195 0.188 0.18 0.173 0.164 0.156 0.149 0.142 0.135 0.129

Flat Touching /km 0.148 0.143 0.140 0.135 0.13 0.126 0.122 0.118 0.115 0.112 0.109 0.107

Flat Cables spaced /km 0.190 0.186 0.182 0.177 0.172 0.168 0.163 0.159 0.156 0.153 0.150 0.148

Flat Ducts touching /km 0.176 0.172 0.168 0.163 0.158 0.153 0.149 0.145 0.142 0.139 0.135 0.133

Operating capacitance@30kV and 50Hz F/km 0.18 0.19 0.20 0.21 0.23 0.25 0.28 0.30 0.34 0.37 0.40 0.43

Charging current@30kV and 50Hz A/km 0.98 1.03 1.09 1.14 1.25 1.36 1.52 1.63 1.85 2..01 2.20 2.37

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Three Core Unarmored Medium Voltage Cables

10kV
Three Core Unarmored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 6/10/12 kV Nominal insulation thickness: 8 mm

Nominal cross section of the conductor
Alrm mm 50 70 95 120 150 185 240
Alrs mm - - 95 120 150 185 240
Curs mm 50 70 95 120 150 185 240
Outer diameter stranded conductor (Aluminum or copper) mm 48 52 56 59 62 66 71
Outer diameter solid conductor (Aluminum only) mm 47 51 54 57 60 63 68
Net weight, aluminum conductor (stranded and solid) kg/m 2.4 2.5 2.6 3.0 3.4 3.9 4.6
Net weight, copper conductor (stranded only) kg/m 3.5 4.0 4.7 5.7 6.7 8.2 10
Minimum bending radius: during laying (stranded conductors) m 0.68 0.74 0.81 0.86 0.92 0.99 1.08
Minimum bending radius: installed (stranded conductors m 0.57 0.62 0.68 0.72 0.77 0.82 0.90
Minimum bending radius: during laying (solid aluminum conductors) m 0.66 0.72 0.78 0.83 0.88 0.94 1.02
Minimum bending radius: installed (solid aluminum conductors) m 0.55 0.60 0.65 0.69 0.73 0.78 0.85
Electrical properties:
Approximate reactance per phase@50Hz /km 0.114 0.107 0.102 0.099 0.096 0.093 0.089
Operating capacitance per phase @10kV and 50Hz /km 0.24 0.28 0.31 0.34 0.36 0.4 0.44
Charging current @10kV and 50Hz /km 0.44 0.51 0.56 0.62 0.65 0.73 0.80

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15kV
Three Core Unarmored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 8.7/15/18 kV Nominal insulation thickness: 4.5 mm

Nominal cross section of the conductor
Alrm mm 50 70 95 120 150 185 240
Alrs mm - - 95 120 150 185 240
Curs mm 50 70 95 120 150 185 240

Outer diameter stranded conductor (Aluminum or copper) mm 53 57 61 64 67 71 76

Outer diameter solid conductor (Aluminum only) mm 52 56 59 62 65 68 73
Net weight, aluminum conductor (stranded and solid) kg/m 2.6 2.7 2.8 3.2 3.7 4.2 4.9
Net weight, copper conductor (stranded only) kg/m 3.7 4.3 5.0 5.9 7.0 8.5 10.4
Minimum bending radius: during laying (stranded conductors) m 0.74 0.80 0.87 0.92 0.98 1.05 1.13
Minimum bending radius: installed (stranded conductors m 0.62 0.67 0.72 0.77 0.81 0.87 0.94
Minimum bending radius: during laying (solid aluminum m 0.715
0.777 0.834 0.888 0.938 0.966 1.08
conductors)
Minimum bending radius: installed (solid aluminum conductors) m 0.596 0.647 0.695 0.74 0.782 0.83 0.9
Electrical properties:
Approximate reactance per phase@50Hz /km 0.12 0.114 0.108 0.104 0.101 0.097 0.094
Operating capacitance per phase @15kV and 50Hz /km 0.20 0.22 0.25 0.27 0.29 0.32 0.35
Charging current @15kV and 50Hz /km 0.54 0.60 0.68 0.73 0.79 0.87 0.95

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20kV
Three Core Unarmored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 8.7/15/18 kV Nominal insulation thickness: 4.5 mm

Nominal cross section of the conductor
Alrm mm 50 70 95 120 150 185 240
Alrs mm - - 95 120 150 185 240
Curs mm 50 70 95 120 150 185 240

Outer diameter stranded conductor (Aluminum or copper) mm 58 62 66 69 72 76 81

Outer diameter solid conductor (Aluminum only) mm 57 60 64 67 70 73 78
Net weight, aluminum conductor (stranded and solid) kg/m 3.0 3.2 3.3 3.7 4.2 4.8 5.5
Net weight, copper conductor (stranded only) kg/m 4.1 4.7 5.5 6.4 7.5 9.0 11.0
Minimum bending radius: during laying (stranded conductors) m 0.80 0.86 0.93 0.98 1.03 1.10 1.19
Minimum bending radius: installed (stranded conductors m 0.66 0.71 0.77 0.82 0.86 0.92 0.99
Minimum bending radius: during laying (solid aluminum m 0.77
0.83 0.89 0.95 1.00 1.05 1.14
conductors)
Minimum bending radius: installed (solid aluminum conductors) m 0.64 0.70 0.74 0.79 0.83 0.88 0.95
Electrical properties:
Approximate reactance per phase@50Hz /km 0.126 0.119 0.113 0.109 0.105 0.101 0.098
Operating capacitance per phase @50kV and 50Hz /km 0.17 0.19 0.22 0.23 0.25 0.27 0.30
Charging current @20kV and 50Hz /km 0.617 0.689 0.798 0.834 0.907 0.979 1.088

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30kV
Three Core Unarmored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 18/30/36 kV Nominal insulation thickness: 8 mm

Nominal cross section of the conductor
Alrm mm - - 150 185 240
Alrs mm 95 120 150 185 240
Curs mm 95 120 150 185 240

Outer diameter stranded conductor (Aluminum or

mm 77 80 83 87 92
copper)
Outer diameter solid conductor (Aluminum only) mm - - 81 84 89
Net weight, aluminum conductor (stranded and
kg/m 4.1 4.5 5.1 5.7 6.5
solid)
Net weight, copper conductor (stranded only) mm 6.3 7.3 8.4` 9.9 12
Minimum bending radius: during laying (stranded
m 1.06 1.11 1.17 1.24 1.32
conductors)
Minimum bending radius: installed (stranded
m 0.88 0.93 0.97 1.03 1.1
conductors
Minimum bending radius: during laying
m - - 1.13 1.19 1.27
(solid aluminum conductors)
Minimum bending radius: installed
m - - 0.94 0.99 1.06
(solid aluminum conductors)
Electrical properties:
Approximate reactance per phase@50Hz /km 0.123 0.93 0.119 0.115 0.108
Operating capacitance per phase @30kV and
/km 0.17 0.18 0.19 0.21 0.24
50Hz
Charging current @30kV and 50Hz /km 0.93 0.98 1.03 1.14 1.31

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10kV
Three Core Armored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 6/10/12 kV Nominal insulation thickness: 3.4 mm

Nominal cross section of the conductor:

Alrm mm 50 70 95 120 150 185 240

Alrs mm - - 95 120 150 185 240

Curs mm 50 70 95 120 150 185 240

STA mm 53 56 61 64 68 72 77

SWA mm 56 60 64 68 71 75 82
Outer diameter
STA + Pb mm 57 60 65 68 72 76 81

SWA + Pb mm 60 64 68 72 75 79 86

Net weight, aluminum conductor (stranded and solid) STA kg/m 3.0 3.5 4.1 4.8 5.1 5.9 6.9

Net weight, copper conductor (stranded only) STA kg/m 3.9 4.8 5.9 7 7.9 9.3 11.4

Net weight, aluminum conductor (stranded and solid) SWA kg/m 4.7 5.3 6.1 6.8 7.3 8.2 10.4

Net weight, copper conductor (stranded only) SWA kg/m 5.6 6.6 7.9 9.0 10.1 11.6 14.9

Net weight, aluminum conductor (stranded and solid) STA + Pb kg/m 3.5 4.1 4.7 5.5 5.8 6.6 7.7

Net weight, copper conductor (stranded only) STA + Pb kg/m 4.4 5.4 6.5 7.7 8.6 10.0 12.2

Net weight, aluminum conductor (stranded and solid) SWA + Pb kg/m 5.2 5.9 6.7 7.5 8.0 8.9 11.2

Net weight, copper conductor (stranded only) SWA + Pb kg/m 6.1 7.2 8.5 9.7 10.8 12.3 15.7

Minimum bending radius: during laying m 0.7 0.76 0.83 0.89 0.94 1.01 1.10

Minimum bending radius: installed m 0.56 0.61 0.66 0.71 0.75 0.8 0.88

Electrical properties:

Approximate reactance per phase@50Hz /km 0.114 0.107 0.10 0.10 0.096 0.093 0.089

Operating capacitance per phase @10kV and 50Hz /km 0.24 0.28 0.31 0.34 0.36 0.40 0.44

Charging current @10kV and 50Hz /km 0.44 0.51 0.56 0.62 0.65 0.73 0.80

Electrical properties:

Approximate reactance per phase@50Hz /km 0.114 0.107 0.10 0.10 0.096 0.093 0.089

Operating capacitance per phase @10kV and 50Hz /km 0.24 0.28 0.31 0.34 0.36 0.40 0.44

Charging current @10kV and 50Hz /km 0.44 0.51 0.56 0.62 0.65 0.73 0.80

STA =Steel Tape Armour SWA =Steel Wire Armour Pb =Lead Alloy Sheath

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15kV
Three Core Armored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 8.7/15/18 kV Nominal insulation thickness: 4.5 mm

Nominal cross section of the conductor:

Alrm mm 50 70 95 120 150 185 240
Alrs mm - - 95 120 150 185 240
Curs mm 50 70 95 120 150 185 240

Outer diameter STA mm 58 62 66 70 73 77 83

SWA mm 62 65 70 73 76 82 88
STA + Pb mm 62 66 70 74 77 81 87
SWA + Pb mm 66 69 74 77 80 86 92
Net weight, aluminum conductor (stranded and solid) STA kg/m 3.5 4 4.7 5.4 5.8 6.6 7.7
Net weight, copper conductor (stranded only) STA kg/m 4.4 5.3 6.5 7.6 8.6 10 12.2
Net weight, aluminum conductor (stranded and solid) SWA kg/m 5.4 5.9 6.8 7.6 9 10.1 11.4
Net weight, copper conductor (stranded only) SWA kg/m 6.3 7.2 8.6 9.8 11.8 13.5 15.9
Net weight, aluminum conductor (stranded and solid) STA + Pb kg/m 4.1 4.6 5.4 6.1 6.6 7.4 8.6
Net weight, copper conductor (stranded only) STA + Pb kg/m 5.0 5.9 7.2 8.3 9.4 10.8 13.1
Net weight, aluminum conductor (stranded and solid) SWA + Pb kg/m 6.0 6.5 7.5 8.3 9.8 10.9 12.3
Net weight, copper conductor (stranded only) SWA + Pb kg/m 6.9 7.8 9.3 10.5 12.6 14.3 16.8
Minimum bending radius: during laying m 0.77 0.82 0.89 0.95 1 1.07 1.16
Minimum bending radius: installed m 0.61 0.66 0.71 0.76 0.8 0.86 0.93
Electrical properties:
Approximate reactance per phase@50Hz /km 0.12 0.114 0.108 0.104 0.101 0.097 0.094

Operating capacitance per phase @15kV and 50Hz /km 0.20 0.22 0.25 0.27 0.29 0.32 0.35

Charging current @15kV and 50Hz /km 0.54 0.60 0.68 0.73 0.79 0.87 0.95

STA =Steel Tape Armour SWA =Steel Wire Armour Pb =Lead Alloy Sheath

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20kV
Three Core Armored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 12/20/24 kV Nominal insulation thickness: 5.5 mm

Nominal cross section of the conductor:

Alrm mm 50 70 95 120 150 185 240
Alrs mm - - 95 120 150 185 240
Curs mm 50 70 95 120 150 185 240

Outer diameter STA mm 63 67 71 74 79 82 89

SWA mm 67 70 75 79 83 87 93
STA + Pb mm 67 71 75 78 83 86 93
SWA + Pb mm 71 74 79 83 87 91 97
Net weight, aluminum conductor (stranded and solid) STA kg/m 3.8 4.5 5.2 5.9 6.3 7.2 9.1
Net weight, copper conductor (stranded only) STA kg/m 4.9 5.8 7.0 8.1 9.1 10.6 13.6
Net weight, aluminum conductor (stranded and solid) SWA kg/m 5.0 6.1 7.5 9.2 9.8 10.9 12.3
Net weight, copper conductor (stranded only) SWA kg/m 6.9 7.9 9.3 11.4 12.6 14.3 16.8
Net weight, aluminum conductor (stranded and solid) STA + Pb kg/m 4.4 5.2 5.9 6.7 7.1 8.1 10.0
Net weight, copper conductor (stranded only) STA + Pb kg/m 5.5 6.5 7.7 8.9 9.9 11.5 14.5
Net weight, aluminum conductor (stranded and solid) SWA + Pb kg/m 5.7 6.8 8.2 10.0 10.6 11.8 13.3
Net weight, copper conductor (stranded only) SWA + Pb kg/m 7.6 8.6 10.0 12.2 13.4 15.2 17.8
Minimum bending radius: during laying m 0.82 0.86 0.95 1.01 1.07 1.13 1.22
Minimum bending radius: installed m 0.66 0.69 0.76 0.8 0.85 0.9 0.98
Electrical properties:
0.11 0.11 0.10 0.10 0.09
Approximate reactance per phase@50Hz /km 0.126 0.105
9 3 9 1 8
Operating capacitance per phase @20kV and 50Hz /km 0.17 0.19 0.22 0.23 0.25 0.27 0.30
0.68 0.78 0.83 0.90 0.97 1.08
Charging current @20kV and 50Hz /km 0.617
9 9 4 7 9 8

STA =Steel Tape Amour SWA =Steel Wire Amour Pb =Lead Alloy Sheath

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30kV
Three Core Armored Medium Voltage Cables

Constructional data:

Rated voltages: Uo/U /Um: 18/30/36 kV Nominal insulation thickness: 8 mm

Nominal cross section of the conductor:

Alrm mm - - 150 185 240
Alrs mm 95 120 150 185 240
Curs mm 95 120 150 185 240

Outer diameter STA mm 86 88 91 95 102

SWA mm 88 91 95 99 106
STA + Pb mm 90 92 95 99 106
SWA + Pb mm 92 95 99 103 110
Net weight, aluminum conductor (stranded and solid) STA kg/m 8.0 8.2 8.7 9.7 11.7
Net weight, copper conductor (stranded only) STA kg/m 9.5 10.4 11.5 13.1 15.2
Net weight, aluminum conductor (stranded and solid) SWA kg/m 10.2 10.9 11.7 13 14.5
Net weight, copper conductor (stranded only) SWA kg/m 12.5 13.4 14.5 16.4 18.6
Net weight, aluminum conductor (stranded and solid) STA + Pb kg/m 8.6 9.1 9.7 10.7 12.8
Net weight, copper conductor (stranded only) STA + Pb kg/m 10.4 11.3 12.5 14.1 16.3
Net weight, aluminum conductor (stranded and solid) SWA + Pb kg/m 10.9 11.8 12.7 14.0 15.6
Net weight, copper conductor (stranded only) SWA + Pb kg/m 13.4 14.3 15.5 17.4 19.7
Minimum bending radius: during laying m 1.11 1.15 1.2 1.27 1.37
Minimum bending radius: installed m 0.89 0.92 0.96 1.01 1.10
Electrical properties:
Approximate reactance per phase@50Hz /km 0.123 0.119 0.115 0.111 0.108
Operating capacitance per phase @30kV and 50Hz /km 0.17 0.18 0.19 0.21 0.24
Charging current @30kV and 50Hz /km 0.93 0.98 1.03 1.14 1.31

STA =Steel Tape Amour SWA =Steel Wire Amour Pb =Lead Alloy Sheath

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Using Tables

Current ratings

The continuous current ratings mentioned in the tables are based on standards IEC-60502-2 both of these mentioned
standards contain current rating information and the cal-calculation methods of both standards are based on IEC60287.

Electrical properties

The electrical properties and continuous current ratings apply to single core, three core, unarmored and armored cables
where applicable, with the mentioned copper wire screen surface area. The total surface area of the copper wires screen
may be adjusted to fit the required single phase short-circuit rating.

Cyclic loading

Where loading is cyclic, appreciable increase in current capacities may be justified. Please refer to IEC Publication
60853 for calculation of the cyclic ratings.

Characteristics

Impedances, such as positive and negative sequence impedances and zero sequence impedance are strongly
depending on laying configuration, metallic sheath bonding and other conductive elements parallel to the cable route.
The mentioned impedances are therefore indicative only and should be calculated per situation and confirmed by
measurements after circuit completion.

20/28


Selecting an energy cable

Different kinds of power cable constructions are required to transport electrical power from the energy
station to the consumer. The following factors are important when selecting a suitable cable
construction:

-Maximum operating voltage.

-Insulation level.
-Frequency;
-Load to be carried;
-Daily load curve;
-Magnitude and duration of possible overload currents;
-Insulation level of equipment (bare conductor insulators, arresters, etc.)
-Voltage drop.
-Length of the circuit.
-Profile of the circuit.
-Mode of installation:
-Underground (whether directly or in ducts);
-In air (if in a tunnel, the dimensions and mode of ventilation of the tunnel);
-Chemical and physical properties of the soil:
Whether rocky, sandy, clay, boggy, moist or dry, chemical agents liable to cause
corrosion etc.
-The maximum thermal resistivity of the soil;
-Maximum and minimum ambient air and soil temperatures, bearing in mind nearby -hot-water
pipes and other factors liable to heat (or cool) the cables.
-Specifications and requirements to be met;
The cable should be economical to use: An optimum cross-sectional area may be
calculated based on the capital costs of the cable and its running costs caused by the
power losses in the cable.

Rated Voltage

The voltage which forms the basis for certain operating characteristics and test conditions is called the
rated voltage and is denoted Uo/U where:

Uo = the rated r.m.s. power frequency voltage between each conductor and sheath or sheath for which
cables and accessories are designed;

U = the rated r.m.s. power frequency voltage between any two conductors for which cables and
accessories are designed.

Operating voltage
Um = the maximum r.m.s. power frequency voltage between any two conductors for which
cables and accessories are designed;

Um is the highest voltage that can be sustained under normal operating conditions at any time and at
any point in a system (temporary voltage variations due to fault conditions excluded).

Relationship between Uo/U and Um in three phase systems are prescribed in IEC standard 60183 and
USA standard C-84.

Standards

The cables described in this catalogue are standard designs, and their performance has been proven in
operation.

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Continuous Current-Carrying Capacity

IEC60502-2
A separate group of three single core cables may be continuously loaded in accordance with the
appropriate tables if the following assumptions are fulfilled.

Assumptions:
- Ratings apply to three-phase group(s) of single or three core cables.
- Maximum permissible temperature of the inner conductor during continuous use: 90.
- Ambient air temperature: 30.
- Ground temperature: 20.
- Depth of laying of the cables: 0.8 m.
- Thermal resistively of the soil: 1.5 K.m/W.
- No soil dry-out.
- Cables in air: Naturally ventilated and protected from solar radiation;
- Current ratings are based on solid bonded metallic sheaths.
- Correction factors for other installations are given in the appropriate tables.

A temporary overload of the conductor to a maximum temperature of 105 is allowable, but should be
evaluated for each individual case.

22/28


Circular Mils

In American standards the cross sectional area is

expressed in Circular Mils Ac.
The relation between cross sections expressed Where A is the cross sectional area of the
in mm2 and Circular Mils is: conductor or armoring in mm2.
AC
A= mm 2 Where A is the cross sectional area of the
1973.5 conductor or armoring in mm2.

At lower temperature the cables must be

Weights and dimensions adequately warmed up before installation. This
may be achieved by storing the cables in a
Weights, dimensions and characteristic data are heated room for at least 24h or by means of
approximate values only. Deviations due to special equipment.
different constructions may occur.
Resistances
Sheath marking Direct current resistance
The maximum DC resistance values of
Our standard embossed or surface printed outer conductors at 20oC are in the relevant tables.
sheath marking on round cables consists of: The DC resistance at other conductor
Name of manufacturer; temperatures may be calculated using the
Type designation, cross-sectional area of equation:
conductor, rated voltage and year of
manufacture, Continuous length marking every R = R20 [1 + 20 (T 20C )]
meter or every few feet. R = DC resistance at temperature, /km.
R20 = DC resistance of conductor at 20, /km.
T = Temperature of conductor, .
Laying information 20 = Temperature coefficient of the resistance at
20, 1/,
For copper 20=0.00393,
During laying of energy cables, particular
Aluminum: 20=0.00403.
attention must be paid to the permissible tensile
force:
-Permissible tensile forces when pulling by cable Effective resistance
pulling grip for single core and three core plastic The effective resistance (= alternating current
cables with copper or aluminum conductors up to resistance) consists of the DC resistance and the
and including 18/30kV cables: extra resistance, which takes into account
additional losses caused by the current
F = 3 x D2 in Newtons
displacement in the conductor (skin effect and
-Permissible tensile forces when pulling by cable
proximity effect).
pulling grip for three core plastic cables with
copper or aluminum conductors and steel In the tables the given effective resistance of the
armoring wires up to and including 18/30kV conductors at maximum conductor temperature
cables: is based on the following assumptions:
F = 8 xD2 Newtons -Frequency 50 Hz;
-Solid bonded circuit;
Where D is the cable outer diameter expressed
in mm

-Maximum recommended tensile forces when a

pulling eye is attached to the conductor:
Alu stranded: F = A x 30 N/mm2
Alu solid: F = A x 20 N/mm2
Cu stranded: F = A x 50 N/mm2

-Maximum recommended tensile force when a

pulling eye is attached to the armoring wires:
Steel wires: F = A x 150 N/mm2

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Inductance

The inductances can be calculated for the

various laying configurations with the following
equation:

X Thermal stresses
L=
2 f
L = Inductance, mH/km In the previous tables, the mentioned maximum
X = Reactance, ohm/km permissible short circuit currents are applicable
f = System frequency, Hz for a short circuit duration of one second. The
values are based on the following assumptions:

Operating capacitance, charging current and - Before short circuit the temperature of
earth fault current conductors = max. Permissible temperature of
conductor in continuous use (i.e.: 90)
The values for the operating capacitance of the
cables are average values based on - Max. Permissible temperature of conductor
measurements and calculations. The values for in short circuit is 250 for XLPE insulated
the charging current are valid at a temperature of cables, for the metallic sheath is 210.
20, at a frequency of 50 Hz and at the rated
voltage of the cable. - The permissible short-circuit current for
durations of 0.2 to 5 seconds may be calculated
The values of capacitance, charging current and by multiplying the max. Permissible short-circuit
earth fault current will not change when using
XLPE insulated cables when the temperature current for one second by a value of 1 t ,
increases from 20 to the maximum where t is the new short-circuit duration in
permissible continuous conductor temperature. seconds.

Short-circuit current capacity

When planning cable installations, care has to be

taken that the cables and fittings chosen are
capable of withstanding the expected dynamic
and thermal short-circuit stresses.

The dynamic stresses depend on the maximum

asymmetric short-circuit current and the thermal
stresses depend on the mean short-circuit
current.

Dynamic stresses

In general, cables and their accessories will

withstand the dynamic stresses under
short-circuit conductions without problems, but
near power stations it is important to take the
dynamic short-circuit current capacity into

consideration and to pay attention to the method

of installation.

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Electrical Characteristics of 10kV-30kV Conductors

Nominal cross * * * * * * * *
section of the
conductor:

Alrm mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 1200

Alrs mm2 - - 95 120 150 185 240 300 400 500 630 - - -

Curs mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 -
Copper wire screen
mm2 16 16 16 16 25 25 25
surface area

Max D.C. conductor

resistance at 20C /km 0.387 0.268 0.193 0.153 0.124 0.099 0.075 0.06 0.047 0.037 0.028 0.022 0.018 -
(Copper conductor)
Approximate A.C.
resistance at 90C /km 0.494 0.342 0.247 0.196 0.159 0.128 0.098 0.079 0.079 0.049 0.041 0.032 0.024 -
(Copper conductor)
Max D.C. conductor
resistance at 20C
/km 0.641 0.443 0.32 0.253 0.206 0.164 0.125 0.1 0.078 0.061 0.047 0.037 0.029 0.025
(Aluminum
conductor)
Max D.C. conductor
resistance at 20C
/km 0.822 0.568 0.411 0.325 0.265 0.211 0.161 0.13 0.102 0.08 0.063 0.051 0.043 0.032
(Aluminum
conductor)
DC resistance of the
metallic screen
/km 1.078 1.078 1.078 1.078 0.690 0.690 0.690 0.690 0.493 0.493 0.493 0.431 0.345 0.287
@ 20C
(approximate value)

Maximum short-circuit current

for one second
Copper conductor kA 7.4 10.3 13.9 17.6 21.9 27 34.9 43.5 57.9 72.3 91 115.5 144.2 -

Aluminum conductor kA 7.4 10.3 13.9 17.6 21.9 27 34.9 28.9 38.4 48 60.3 76.5 95.5 114.5

Copper wire screen kA 3.2 3.2 3.2 3.2 4.9 4.9 4.9 4.9 6.9 6.9 6.9 7.9 9.8 11.8

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Current rating for 10-30kV single core medium voltage cables in accordance with IEC60502-2

Nominal cross section of the

* * * * * * * *
conductor:
Alrm mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 1200
Alrs mm2 - - 95 120 150 185 240 300 400 500 630 - - -
Curs mm2 50 70 95 120 150 185 240 300 400 500 630 800 1000 -
Copper wire screen surface area mm2 16 16 16 16 25 25 25

Copper conductor:

Direct buried Trefoil (touching) A 196 239 285 323 361 406 469 526 590 675 755 810 862 -
Direct buried Flat (touching) A 205 250 295 335 370 420 480 535 590 655 725 764 801 -
Direct buried Flat (spaced) A 203 246 293 332 366 410 470 524 572 650 715 746 765 -
In ducts Trefoil (touching) A 186 227 271 308 343 387 447 504 564 605 670 759 798 -
In ducts Flat (touching) A 188 229 274 311 347 391 453 510 571 597 643 689 705 -
In air Trefoil (touching) A 238 296 361 417 473 543 641 735 845 900 1030 1145 1264 -
In air Flat (touching) A 243 303 369 426 481 550 647 739 837 908 1040 1191 1280 -
In air Flat (spaced) A 286 356 434 500 559 637 745 846 938 1013 1134 1306 1360 -

Aluminum conductor:

Direct buried Trefoil (touching) A 152 186 221 252 281 317 367 414 470 545 615 668 730 768
Direct buried Flat (touching) A 160 195 230 260 290 330 380 425 475 540 605 639 688 717
Direct buried Flat (spaced) A 157 192 229 260 288 324 373 419 466 535 600 633 669 684
In ducts Trefoil (touching) A 144 176 210 240 267 303 351 397 451 505 565 628 678 707
In ducts Flat (touching) A 146 178 213 242 271 307 356 402 457 487 546 587 617 631
In air Trefoil (touching) A 184 230 280 324 332 424 502 577 673 720 835 1018 1138 1222
In air Flat (touching) A 189 236 287 332 391 432 511 586 676 730 850 1040 1160 1200
In air Flat (spaced) A 222 278 338 391 368 504 593 677 769 840 956 1089 1171 1209

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Current rating for 10-30kV three cores armored and unarmored medium voltage cables in accordance
with IEC60502-2

Nominal cross section of the conductor: * * * *

Alrm mm2 50 70 95 120 150 185 240

Alrs mm2 - - 95 120 150 185 240

Curs mm2 50 70 95 120 150 185 240

Copper wire screen surface area mm2 16 16 16 16 25 25 25

Copper conductor:

Unarmoured Direct buried A 181 221 262 298 334 377 434
Unarmoured In ducts A 158 193 231 264 297 336 390
Unarmoured In air A 204 253 304 351 398 455 531
Armoured Direct buried A 181 220 263 298 332 374 431
Armoured In ducts A 158 194 232 264 296 335 387
Armoured In air A 205 253 307 352 397 453 529

Aluminium conductor:

Unarmoured Direct buried A 140 171 203 232 260 294 340
Unarmoured In ducts A 122 150 179 205 231 262 305
Unarmoured In air A 158 196 236 273 309 355 415
Armoured Direct buried A 140 171 204 232 259 293 338
Armoured In ducts A 123 150 180 206 231 262 304
Armoured In air A 159 196 238 274 309 354 415

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Rating factors for single and three core medium voltage cables based on IEC60502-2

Rating factors for variation of ambient air temperature:

Ambient air temperature [C] 20 25 30 35 40 45 50 55 60

Value 1.08 1.04 1.0 0.96 0.91 0.87 0.82 0.76 0.71

Rating factors for variation of ground temperature

Ground temperature [C] 10 15 20 25 30 35 40 45 50
Value 1.07 1.04 1.0 0.96 0.93 0.89 0.85 0.8 0.76

Rating factors for variation of installation depth for direct buried cables
Installation depth [m] 0.5 0.5 0.8 1 1.25 1.5 1.75 1.75 2.5 3
Single core cables: 185mm2 1.04 1.04 1.0 0.98 0.96 0.95 0.94 0.94 0.91 0.9
Single core cables: >185mm2 1.06 1.06 1.0 0.97 0.95 0.93 0.91 0.91 0.88 0.86
Three core cables 1.04 1.04 1.0 0.98 0.96 0.95 0.94 0.94 0.91 0.9

Rating factors for variation of installation depth for cables installed in ducts
Installation depth [m] 0.5 0.6 0.8 1 1.25 1.5 1.75 2 2.5 3
Single core cables: 185mm2 1.04 1.02 1.0 0.98 0.96 0.95 0.94 0.93 0.91 0.9
Single core cables: >185mm2 1.05 1.03 1.0 0.97 0.95 0.93 0.92 0.91 0.89 0.88
Three core cables 1.03 1.02 1.0 0.99 0.97 0.96 0.95 0.94 0.93 0.92

Axial separations of circuits Thermal resistivity Number of parallel cable circuits

[K.m/W] 1 2 3 4
0.7 1.37 1.21 1.08 1.03
0.8 1.3 1.14 1.03 0.98
0.9 1.24 1.09 0.98 0.93
Rating factors for variation of thermal
resistivity of the soil and groups of direct 1.0 1.19 1.05 0.94 0.89
buried single core cables, where the 1.5 1.00 0.88 0.79 0.75
circuits are spaced 400 mm apart 2.0 0.88 0.77 0.70 0.66
2.5 0.79 0.70 0.62 0.59
3.0 0.73 0.64 0.58 0.55
0.7 1.25 1.15 1.06 1.03
0.8 1.21 1.11 1.03 0.99

Rating factors for variation of thermal resistivity 0.9 1.17 1.08 0.99 0.96
of the soil and groups of single 1.0 1.14 1.05 0.97 0.93
core cables installed in ducts, where the 1.5 1.00 0.92 0.85 0.82
circuits are spaced 400 mm apart 2.0 0.90 0.83 0.77 0.74
2.5 0.83 0.76 0.71 0.68
3.0 0.77 0.71 0.65 0.63
0.7 1.28 1.15 1.05 1.01
0.8 1.23 1.11 1.01 0.97

Rating factors for variation of thermal 0.9 1.19 1.07 0.98 0.94
resistivity of the soil and groups of direct 1.0 1.15 1.04 0.94 0.91
buried three core cables, where the 1.5 1.00 0.9 0.82 0.79
circuits are spaced 400 mm apart 2.0 0.90 0.81 0.74 0.71
2.5 0.82 0.74 0.67 0.65
3.0 0.76 0.68 0.62 0.60
0.7 1.17 1.08 0.99 0.96
0.8 1.14 1.05 0.97 0.93

Rating factors for variation of thermal 0.9 1.12 1.03 0.95 0.92
resistivity of the soil and groups of three 1.0 1.10 1.01 0.94 0.90
core cables installed in ducts, where the circuits 1.5 1.00 0.92 0.85 0.82
are spaced 400 mm apart 2.0 0.92 0.85 0.78 0.75
2.5 0.86 0.79 0.73 0.71
3.0 0.81 0.75 0.69 0.66
S = axial separation of groups of cable
D = cable diameter

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