IEC 60245-4:2026

IEC 60245-4 ®
Edition 4.0 2026-04
INTERNATIONAL
STANDARD
REDLINE VERSION
Rubber insulated cables - Rated voltages up to and including 450/750 V -
Part 4: Cords and flexible cables
ICS 29.060.20 ISBN 978-2-8327-1207-8
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CONTENTS
FOREWORD . 3
1 General .
1.1 Scope . 5
1.2 Normative references . 5
3 Terms and definitions . 6
24 Braided cord . 7
35 Ordinary tough rubber sheathed cord. 7
35.1 Code designation . 7
35.2 Rated voltage . 7
35.3 Construction . 7
35.3.1 Conductors . 7
35.3.2 Separator . 7
35.3.3 Insulation . 7
35.3.4 Assembly of cores and filler, if any . 7
35.3.5 Sheath . 8
35.3.6 Overall diameter . 8
35.4 Tests . 8
35.5 Guide to useGuidance on use of the cables . 8
46 Ordinary polychloroprene or other equivalent synthetic elastomer sheathed cord . 11
46.1 Code designation . 11
46.2 Rated voltage . 11
46.3 Construction . 11
46.3.1 Conductors . 11
46.3.2 Separator . 11
46.3.3 Insulation . 11
46.3.4 Assembly of cores and filler, if any . 11
46.3.5 Sheath . 11
46.3.6 Overall diameter . 12
46.4 Tests . 12
6.4.1 General . 12
6.4.2 Flexing test . 12
46.5 Guidance on use of the cables . 12
57 Heavy polychloroprene or other equivalent synthetic elastomer sheathed flexible
cable . 15
57.1 Code designation . 15
57.2 Rated voltage . 15
57.3 Construction . 15
57.3.1 Conductors . 15
57.3.2 Separator . 15
57.3.3 Insulation . 15
57.3.4 Proofed textile tape . 15
57.3.5 Assembly of cores and filler, if any . 15
57.3.6 Sheath . 16
57.3.7 Overall diameter . 16
57.4 Tests . 16
57.5 Guide to useGuidance on use of cables . 17
68 Polychloroprene or equivalent synthetic elastomer sheathed cable for decorative
chains. 20
68.1 Code designation . 20
68.2 Rated voltage . 20
68.3 Construction . 20
68.3.1 Conductors . 20
68.3.2 Separator . 20
68.3.3 Insulation . 20
68.3.4 Assembly of cores . 20
68.3.5 Sheath . 20
68.3.6 Overall dimensions . 21
68.4 Tests . 21
8.4.1 General . 21
8.4.2 Flexing test . 21
68.5 GuideGuidance to use . 21
Bibliography . 23

Table 1 – Dimensions of type 60245 IEC 53 . 9
Table 2 – Tests for type 60245 IEC 53 . 10
Table 3 – Dimensions of type 60245 IEC 57 . 13
Table 4 – Tests for type 60245 IEC 57 . 14
Table 5 – Dimensions of type 60245 IEC 66 . 17
Table 6 – Tests for type 60245 IEC 66 . 19
Table 7 – Dimensions of type 60245 IEC 58 and 60245 IEC 58f . 21
Table 8 – Tests for the types 60245 IEC 58 and 60245 IEC 58f . 22

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Rubber insulated cables -
Rated voltages up to and including 450/750 V -
Part 4: Cords and flexible cables

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes made
to the previous edition IEC 60245-4:2011. A vertical bar appears in the margin wherever a
change has been made. Additions are in green text, deletions are in strikethrough red text.

International Standard IEC 60245-4 has been prepared by IEC technical committee TC 20:
Electric cables. It is an International Standard.
This fourth edition of IEC 60245-4 cancels and replaces the third edition published in 2011. This
edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) reference to tests according to IEC 60245-2 has been deleted and replaced by IEC 63294;
b) normative references have been updated.
The text of this International Standard is based on the following documents:
Draft Report on voting
20/2273/FDIS 20/2282/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This document is to be used in conjunction with IEC 60245-1:2026.
A list of all the parts in the IEC 60245 series, published under the general title Rubber insulated
cables - Rated voltages up to and including 450/750 V, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 General
1.1 Scope
This part of IEC 60245 defines the particular specifications requirements for rubber insulated
and braided cords and for rubber insulated and rubber or polychloroprene or other equivalent
synthetic elastomer sheathed cords and flexible cables of rated voltages up to and including
450/750 V which apply in addition to the general requirements specified in IEC 60245-1, which
apply to all cables.
All cables should comply with the appropriate requirements given in IEC 60245-1 and the
individual types of cables should each comply with the particular requirements of this part.
The tests for cables specified in the IEC 60245 series are described in IEC 63294.
1.2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
NOTE The IEC 60811 series is currently undergoing a revision, which will lead to a restructuring of its parts. A
description of this, as well as a cross-reference table between the current and planned parts will be given in
IEC 60811-100.
IEC 60228, Conductors of insulated cables
IEC 60245-1:20032026, Rubber insulated cables - Rated voltages up to and including
450/750 V - Part 1: General requirements
Amendment 1:2007
IEC 60245-2:1994, Rubber insulated cables – Rated voltages up to and including 450/750 V –
Part 2: Test methods
Amendment 1:1997
Amendment 2:1997
IEC 60245-8:19982026, Rubber insulated cables - Rated voltages up to and including 450/750
V - Part 8: Cords for applications requiring high flexibility
Amendment 1:2004
Amendment 2:2011
IEC 60811-1-1:1993, Common Test methods for insulating and sheathing materials of electric
cables and optical cables – Part 1-1: Methods for general application – Measurement of
thickness and overall dimensions – Tests for determining the mechanical properties
Amendment 1:2001
IEC 60811-1-2:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section Two: Thermal ageing methods
Amendment 1:1989
Amendment 2:2000
IEC 60811-1-4:1985, Common Test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section Four: Tests at low temperature
Amendment 1:1993
Amendment 2:2001
IEC 60811-2-1:1998, Insulating and sheathing materials of electric and optical cables –
Common test methods – Part 2-1: Methods specific to elastomeric compounds – Ozone
resistance, hot set and mineral  oil immersion tests
Amendment 1:2001
IEC 60719, Calculation of the lower and upper limits for the average outer dimensions of cables
with circular copper conductors and of rated voltages up to and including 450/750 V
IEC 60811-401, Electric and optical fibre cables - Test methods for non-metallic materials -
Part 401: Miscellaneous tests - Thermal ageing methods - Ageing in an air oven
IEC 60811-403, Electric and optical fibre cables - Test methods for non-metallic materials -
Miscellaneous tests - Ozone resistance test on cross-linked compounds
IEC 60811-404, Electric and optical fibre cables - Test methods for non-metallic materials -
Miscellaneous tests - Mineral oil immersion tests for sheaths
IEC 60811-412, Electric and optical fibre cables - Test methods for non-metallic materials -
Part 412: Miscellaneous tests - Thermal ageing methods - Ageing in an air bomb
IEC 60811-501, Electric and optical fibre cables - Test methods for non-metallic materials -
Mechanical tests - Tests for determining the mechanical properties of insulating and sheathing
compounds
IEC 60811-504, Electric and optical fibre cables - Test methods for non-metallic materials -
Mechanical tests - Bending tests at low temperature for insulation and sheaths
IEC 60811-505, Electric and optical fibre cables - Test methods for non-metallic materials -
Mechanical tests - Elongation at low temperature for insulations and sheaths
IEC 60811-507, Electric and optical fibre cables - Test methods for non-metallic materials -
Mechanical tests - Hot set test for cross-linked materials
IEC 62440, Electric cables with a rated voltage not exceeding 450/750 V - Guide to use
IEC 63294:2021, Test methods for electric cables with rated voltage up to and including
450/750 V
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60245-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
type test
T
test required before supplying a type of cable covered by this document on a general
commercial basis, in order to demonstrate satisfactory performance characteristics to meet the
intended application
Note 1 to entry: Type tests are of such a nature that, after they have been carried out, they do not have to be
repeated unless changes are made in the cable materials or design which can change the performance
characteristics.
3.2
sample test
S
test carried out on samples of a completed cable, or components taken from a completed cable,
to check that the finished product meets the design standard
24 Braided cord
See Clause 5 of IEC 60245-8:1998, as introduced in Amendment 1 (2004).
Braided cord is described in IEC 60245-8:2026, Clause 6.
35 Ordinary tough rubber sheathed cord
35.1 Code designation
60245 IEC 53.
35.2 Rated voltage
300/500 V.
35.3 Construction
35.3.1 Conductors
Number of conductors: 2, 3, 4 or 5.
The conductors shall comply with the requirements given in IEC 60228 for class 5 conductors.
The wires may can be plain or tinned.
35.3.2 Separator
A separator of suitable material may can be applied around each conductor.
35.3.3 Insulation
The insulation shall be a rubber compound of type IE4 applied around each conductor.
The insulation shall be applied by extrusion.
The insulation thickness shall comply with the specified value given in Table 1, column 2.
The specified value of the insulation thickness is given in Table 1
35.3.4 Assembly of cores and filler, if any
The cores shall be twisted together.
A centre central filler may can be used.
35.3.5 Sheath
The sheath shall be made of rubber compound of type SE3, applied around the cores.
The thickness of sheath shall comply with the specified value given in Table 1.
The specified value of the sheath thickness is given in Table 1.
The sheath shall be extruded in a single layer and applied in such a way that it fills the spaces
between the cores.
The sheath shall be capable of being removed without damage to the cores.
It shall be possible to remove the sheath without damaging the cores.
35.3.6 Overall diameter
The mean overall diameter shall be within the limits given in Table 1.
35.4 Tests
Compliance with the requirements of 3.3 shall be checked by inspection and by the tests given
in Table 2.
The test methods specified in Table 2 shall be used to perform the tests to check the compliance
with the requirements specified in 5.3.
35.5 Guide to use Guidance on use of the cables
Maximum conductor temperature in normal use: 60 °C.
NOTE Other guidelines are under consideration.
The use of the cable type 60245 IEC 53 shall comply with IEC 62440, which provides guidance
on the safe use of electric cables with a rated voltage not exceeding 450/750 V.
Table 1 – Dimensions of type 60245 IEC 53

Number and nominal Thickness of Thickness of Mean overall dimensions
b a
cross-sectional area of insulation
sheath diameters
conductors
Specified value Specified value Lower limit Upper limit
mm
mm mm mm mm
2 × 0,75 0,6 0,8 5,7 7,4
2 × 1 0,6 0,9 6,1 8,0
2 × 1,5 0,8 1,0 7,6 9,8
2 × 2,5 0,9 1,1 9,0 11,6
2 × 4 1,0 1,2 10,6 13,7
3 × 0,75 0,6 0,9 6,2 8,1
3 × 1 0,6 0,9 6,5 8,5
3 × 1,5 0,8 1,0 8,0 10,4
3 × 2,5 0,9 1,1 9,6 12,4
3 × 4 1,0 1,2 11,3 14,5
4 × 0,75 0,6 0,9 6,8 8,8
4 × 1 0,6 0,9 7,1 9,3
4 × 1,5 0,8 1,1 9,0 11,6
4 × 2,5 0,9 1,2 10,7 13,8
4 × 4 1,0 1,3 12,7 16,2
5 × 0,75 0,6 1,0 7,6 9,9
5 × 1 0,6 1,0 8,0 10,3
5 × 1,5 0,8 1,1 9,8 12,7
5 × 2,5 0,9 1,3 11,9 15,3
5 × 4 1,0 1,4 14,1 17,9
a
The mean overall dimensions diameters have been calculated in accordance with IEC 60719.
b
In case of extension of cross sectional area, the thickness of sheath shall be calculated according to

IEC 60245-1:2026, Annex B.
Table 2 – Tests for type 60245 IEC 53
Categ
a
Ref. No Tests ory of
Test methods
test
1 Electric tests
1.1 Resistance of conductors T, S 60245-2 2.1 IEC 63294:2021, 5.1
1.2 Voltage test on cores according to specified
insulation thickness:
1.2.1 at 1 500 V up to and including for 0,6 mm T 60245-2 2.3 IEC 63294:2021, 5.3
1.2.2 at 2 000 V exceeding 0,6 mm T 60245.2 2.3 IEC 63294:2021, 5.3
1.3 Voltage test on completed cable at 2 000 V T, S 60245-2 2.2 IEC 63294:2021, 5.2
IEC 60245-1 and 60245-2 IEC 63294: 2021
Provisions covering constructional and
dimensional characteristics
2.1 Checking of compliance with constructional T, S 60245-1 Inspection and manual tests
provisions
2.2 Measurement of thickness of insulation T, S 60245-2 1.9 IEC 63294:2021, 6.2
2.3 Measurement of thickness of sheath T, S 60245-2 1.10 IEC 63294:2021, 6.3
2.4 Measurement of overall diameter: 60245-2 1.11
2.4.1 mean value T, S 60245-2 1.11 IEC 63294:2021, 6.4
2.4.2 ovality T, S 60811-1-1 9.1 IEC 63294:2021, 6.4
60245-2 Clause 4
3 Mechanical properties of insulation
3.1 Tensile test before ageing T 60811-1-2 8.2 IEC 60811- 501
3.2 Tensile test after ageing in the air oven T 60811-2-1 Clause 9 IEC 60811-401 and
IEC 60811-501
3.3 Tensile test after ageing in the air bomb T 60811-2-1 Clause 8 IEC 60811-412 and
IEC 60811-501
3.4 Hot set test T 60811-1-1 9.2 IEC 60811-507
3.5 Ozone resistance test T 60811-1-2 8.1.3.1IEC 60811-403
60811-2-1 Clause 9
4 Mechanical properties of sheath
4.1 Tensile test before ageing T IEC 60811-501
4.2 Tensile test after ageing in the air oven T IEC 60811-401 and IEC 60811-501
4.3 Hot set test T 60245-2 IEC 60811-507
60245-2
5 Mechanical strength of completed cable
5.1 Flexing test followed, after immersion in
water, by a voltage test:
60245-2 3.1 and 2.2
at 2 000 V on completed cable having two T IEC 63294:2021, 6.6 and IEC 63294:2021,
cores 5.2 and IEC 60245-1:2026, 6.6.3.1

For cables having more than two cores:

60245-2 3.1 and 2.3 IEC 63294:2021, 6.6
at 1 500 V on cores with a specified
and IEC 63294:2021, 5.3 and IEC 60245-
T
insulation
1:2026, 6.6.3.1
thickness up to and including of 0,6 mm

T
at 2 000 V on cores with specified
60245-2 3.1 and 2.3 IEC 63294:2021, 6.6
insulation
and IEC 63294:2021, 5.3 and IEC 60245-
1:2026, 6.6.3.1
thickness exceeding 0,6 mm
a
All documents cited in this table refer to the dated editions that are listed in the normative references clause.

46 Ordinary polychloroprene or other equivalent synthetic elastomer sheathed
cord
46.1 Code designation
60245 IEC 57.
46.2 Rated voltage
300/500 V.
46.3 Construction
46.3.1 Conductors
Number of conductors: 2, 3, 4 or 5.
The conductors shall comply with the requirements given in IEC 60228 for class 5 conductors.
The wires may can be plain or tinned.
46.3.2 Separator
A separator of suitable material may can be applied around each conductor.
46.3.3 Insulation
The insulation shall be made of rubber compound of type IE4 applied around each conductor.
The insulation shall be applied by extrusion.
The insulation thickness shall comply with the specified value given in Table 3, column 2.
The specified value of the insulation thickness is given in Table 3.
46.3.4 Assembly of cores and filler, if any
The cores shall be twisted together.
A centre filler may can be used.
46.3.5 Sheath
The sheath shall be rubber compound of type SE4 applied around the cores.
The thickness of sheath shall comply with The specified value given in Table 5, column 3.
The specified value of the sheath thickness is given in Table 3.
The sheath shall be extruded in a single layer and applied in such a way that it fills the spaces
between the cores.
The sheath shall be capable of being removed without damage to the cores.
It shall be possible to remove the sheath without damaging the cores.
46.3.6 Overall diameter
The mean overall diameter shall be within the limits given in Table 3.
46.4 Tests
Compliance with the requirements of 4.3 shall be checked by inspection and by the tests given
in Table 4.
6.4.1 General
The test methods specified in Table 4 shall be used to perform the tests to check the compliance
with the requirements specified in 6.3.
6.4.2 Flexing test
The requirements are given in IEC 60245-1:2026, 6.6.3.1.
46.5 Guide to use Guidance on use of the cables
Maximum conductor temperature in normal use: 60 °C.
The use of the cable type 60245 IEC 57 shall comply with IEC 62440, which provides guidance
on the safe use of electric cables with a rated voltage not exceeding 450/750 V.
NOTE Other guidelines are under consideration.
Table 3 – Dimensions of type 60245 IEC 57
Number and nominal
Thickness of
Thickness of
a
cross-sectional area of
Mean overall dimensions diameters
b
insulation sheath
conductors
Specified value Specified value Lower limit Upper limit
mm
mm mm mm mm
2 × 0,75 0,6 0,8 5,7 7,4
2 × 1 0,6 0,9 6,1 8,0
2 × 1,5 0,8 1,0 7,6 9,8
2 × 2,5 0,9 1,1 9,0 11,6
2 × 4 1,0 1,2 10,6 13,7
3 × 0,75 0,6 0,9 6,2 8,1
3 × 1 0,6 0,9 6,5 8,5
3 × 1,5 0,8 1,0 8,0 10,4
3 × 2,5 0,9 1,1 9,6 12,4
3 × 4 1,0 1,2 11,3 14,5
4 × 0,75 0,6 0,9 6,8 8,8
4 × 1 0,6 0,9 7,1 9,3
4 × 1,5 0,8 1,1 9,0 11,6
4 × 2,5 0,9 1,2 10,7 13,8
4 × 4 1,0 1,3 12,7 16,2
5 × 0,75 0,6 1,0 7,6 9,9
5 × 1 0,6 1,0 8,0 10,3
5 × 1,5 0,8 1,1 9,8 12,7
5 × 2,5 0,9 1,3 11,9 15,3
5 × 4 1,0 1,4 14,1 17,9
a
The mean overall dimensions diameters have been calculated in accordance with IEC 60719.
b
In case of extension of cross sectional area, the thickness of sheath shall be calculated according to IEC
60245-1:2026, Annex B.
Table 4 – Tests for type 60245 IEC 57
a
Category of
Test methods
Ref. No. Tests
test
1 Electrical tests
1.1 Resistance of conductors T, S 60245-2 2.1 IEC 63294:2021, 5.1
1.2 Voltage test on cores according to specified insulation
thickness:
1.2.1 at 1 500 V up to and including for 0,6 mm T 60245-2 2.3 IEC 63294:2021, 5.3
1.2.2 at 2 000 V exceeding 0,6 mm T 60245-2 2.3 IEC 63294:2021, 5.3
1.3 Voltage test on completed cable at 2 000 V T, S 60245-2 2.2 IEC 63294:2021, 5.2
2 Provisions covering constructional and dimensional IEC 60245-1 and 60245-2
characteristics IEC 63294:2021
2.1 Checking of compliance with constructional provisions T, S IEC 60245-1 Inspection and manual
tests
2.2 Measurement of thickness of insulation T, S 60245-2 1.9 IEC 63294:2021, 6.2
2.3 Measurement of thickness of sheath T, S 60245-2 1.10 IEC 63294:2021, 6.3
2.4 Measurement of overall diameter:
2.4.1 mean value T, S 60245-2 1.11 IEC 63294:2021, 6.4
2.4.2 ovality T, S 60245-2 1.11 IEC 63294:2021, 6.4
3 Mechanical properties of insulation
3.1 Tensile test before ageing T 60811-1-1 9.1 IEC 60811-501
3.2 Tensile test after ageing in the air oven T 60245-2 Clause 4 IEC 60811-501 and
IEC 60811-401
3.3 Tensile test after ageing in the air bomb T 60811-1-2 8.2 IEC 60811-412 and
IEC 60811-501
3.4 Hot set test T 60811-2-1 Clause 9 IEC 60811-507
3.5 Ozone resistance test T 60811-2-1 Clause 8 IEC 60811-403
4 Mechanical properties of sheath
4.1 Tensile test before ageing T 60811-1-1 9.1 IEC 60811-501
4.2 Tensile test after ageing in the air oven T 60245-2 Clause 4 IEC 60811-501 and
IEC 60811-401
4.3 Tensile test after immersion in oil T 60811-2-1 Clause 10 IEC 60811-404
4.4 Hot set test T 60811-2-1 Clause 9 IEC 60811-507
5 Mechanical strength of completed cable
5.1 Flexing test followed, after immersion in water by a
voltage test:
– at 2 000 V on completed cable having two cores T 60245-2 3.1 and 2.2 IEC 63294:2021,
6.6 and IEC 63294:2021, 5.2 and
IEC 60245-1:2026,6.6.3.1
For cables having more than two cores:
– at 1 500 V on cores with a specified insulation T 60245-2 3.1 and 2.3 IEC 63294:2021,
thickness up to and including of 0,6 mm 6.6 and IEC 63294:2021, 5.3 and
IEC 60245-1:2026,6.6.3.1
– at 2 000 V on cores with specified insulation T
thickness exceeding 0,6 mm 60245-2 3.1 and 2.3 IEC 63294: 2021,
6.6 and IEC 63294:2021, 5.3 and
IEC 60245-1:2026,6.6.3.1
6 Test at low temperature
6.1 Bending test for sheath T IEC 60811-504
a
All documents cited in this table refer to the dated editions that are listed in the normative references clause.
57 Heavy polychloroprene or other equivalent synthetic elastomer sheathed
flexible cable
57.1 Code designation
60245 IEC 66.
57.2 Rated voltage
450/750 V.
57.3 Construction
57.3.1 Conductors
Number of conductors: 1, 2, 3, 4 or 5.
The conductors shall comply with the requirements given in IEC 60228 for class 5 conductors.
The wires may can be plain or tinned.
57.3.2 Separator
A separator of suitable material may can be applied around each conductor.
57.3.3 Insulation
The insulation shall be made of rubber compound of type IE4 applied around each conductor.
The insulation shall be applied by extrusion.
The thickness of insulation shall comply with The specified value given in Table 5.
The specified value of the insulation thickness is given in Table 5.
57.3.4 Proofed textile tape
An optional proofed textile tape may can be applied on each core for cables with conductors
having a nominal cross-section in excesssectional area greater than of 4 mm and it. This textile
tape shall be applied helically wound with an overlap of at least 1 mm.
The tape shall be applied to the insulation in such a manner that it can be removed without
damaging the insulation.
57.3.5 Assembly of cores and filler, if any
The cores shall be twisted together.
A centre filler may can be used.
In the case of cores having conductors of large cross-sectionsectional areas, a textile tape may
can be applied around the core assembly before application of the sheath, provided that the
finished cables shall not have any. No substantial cavity in outer interstices between the cores
of the finished cable shall be present.
57.3.6 Sheath
7.3.6.1 General
The cores shall be covered with a sheath.
The thickness of sheath shall comply with the specified value given in Table 5, columns 3, 4
and 5.
The specified value of the sheath thickness is given in Table 5.
The sheath shall be made up as follows:
57.3.6.2 Sheath for single-core cables
– sheath in a single layer, rubber compound of type SE4.
The sheath shall be in a single layer and made of rubber compound type SE4.
57.3.6.3 Sheath for multicore cables
a) Cross-sections Cables with cross-sectional areas not exceeding 10 mm :
– in a single layer, rubber compound of type SE4.
The sheath shall be in a single layer and made of rubber compound type SE4.
b) Cross-sections in excess of Cables with cross-sectional areas of more than 10 mm :
– either in a single layer, rubber compound of type SE4;
– or in two layers, with the inner layer made of rubber compound of type SE3 and the outer
layer of rubber compound of type SE4.
The sheath shall be in a single layer and made of rubber compound of type SE4;
or in two layers, with the inner layer made of rubber compound of type SE3 and the outer
layer of rubber compound of type SE4.
c) Sheath penetration:
In cases a) and b), the sheath in a single layer or the inner layer of the sheath in two layers
shall fill the spaces between the cores.
The sheath shall be capable of being removed without damage to the laid-up cores.
It shall be possible to remove the sheath without damaging the laid-up cores.
57.3.7 Overall diameter
The mean overall diameter shall be within the limits given in Table 5.
57.4 Tests
Compliance with the requirements of 5.3 shall be checked by inspection and by the tests given
in Table 6.
The test methods specified in Table 6 shall be used to perform the tests to check the compliance
with the requirements specified in 7.3.
The tests at low temperature shall be restricted to cables with conductor(s) having a nominal
cross-sectional area not exceeding 16 mm .
7.5.5 Guide to use Guidance on use of cables
Maximum conductor temperature in normal use: 60 °C.
NOTE Other guidelines are under consideration.
The use of the cable type 60245 IEC 66 shall comply with IEC 62440, which provides guidance
on the safe use of electric cables with a rated voltage not exceeding 450/750 V.
Table 5 – Dimensions of type 60245 IEC 66
b
Thickness of sheath
Thickness of
a
Mean overall diameters
Number and
insulation
Specified value
nominal cross-
sectional area
Two layers
Specified
of conductors
One layer Lower limit Upper limit
values
Inner layer Outer layer
mm mm mm mm mm mm
mm
1 × 1,5 0,8 1,4 – – 5,7 7,1
1 × 2,5 0,9 1,4 – – 6,3 7,9
1 × 4 1,0 1,5 – – 7,2 9,0
1 × 6 1,0 1,6 – – 7,9 9,8
1 × 10 1,2 1,8 – – 9,5 11,9
1 × 16 1,2 1,9 – – 10,8 13,4
1 × 25 1,4 2,0 – – 12,7 15,8
1 × 35 1,4 2,2 – – 14,3 17,9
1 × 50 1,6 2,4 – – 16,5 20,6
1 × 70 1,6 2,6 – –
18,6 23,3
1 × 95 1,8 2,8 – – 20,8 26,0
1 × 120 1,8 3,0 – – 22,8 28,6
1 × 150 2,0 3,2 – – 25,2 31,4
1 × 185 2,2 3,4 – – 27,6 34,4
1 × 240 2,4 3,5 – – 30,6 38,3
1 × 300 2,6 3,6 – – 33,5 41,9
1 × 400 2,8 3,8 – – 37,4 46,8
2 × 1 0,8 1,3 – – 7,7 10,0
2 × 1,5 0,8 1,5 – – 8,5 11,0
2 × 2,5 0,9 1,7  10,2 13,1
2 × 4 1,0 1,8 – – 11,8 15,1
2 × 6 1,0 2,0 – – 13,1 16,8
2 × 10 1,2 3,1 – – 17,7 22,6
2 × 16 1,2 3,3 1,3 2,0 20,2 25,7
2 × 25 1,4 3,6 1,4 2,2 24,3 30,7
3 × 1 0,8 1,4 – – 8,3 10,7
3 × 1,5 0,8 1,6 – – 9,2 11,9
3 × 2,5 0,9 1,8 – – 10,9 14,0
3 × 4 1,0 1,9 – – 12,7 16,2
3 × 6 1,0 2,1 – – 14,1 18,0
3 × 10 1,2 3,3 – – 19,1 24,2
b
Thickness of sheath
Thickness of
a
Mean overall diameters
Number and
insulation
Specified value
nominal cross-
sectional area
Two layers
Specified
of conductors
One layer Lower limit Upper limit
values
Inner layer Outer layer
mm mm mm mm mm mm
mm
3 × 16 1,2 3,5 1,4 2,1
21,8 27,6
3 × 25 1,4 3,8 1,5 2,3 26,1 33,0
3 × 35 1,4 4,1 1,6 2,5 29,3 37,1
3 × 50 1,6 4,5 1,8 2,7 34,1 42,9
3 × 70 1,6 4,8 1,9 2,9 38,4 48,3
3 × 95 1,8 5,3 2,1 3,2 43,3 54,0
4 × 1 0,8 1,5 – – 9,2 11,9
4 × 1,5 0,8 1,7 – – 10,2 13,1
4 × 2,5 0,9 1,9 – – 12,1 15,5
4 × 4 1,0 2,0 – – 14,0 17,9
4 × 6 1,0 2,3 – – 15,7 20,0
4 × 10 1,2 3,4 – – 20,9 26,5
4 × 16 1,2 3,6 1,4 2,2 23,8 30,1
4 × 25 1,4 4,1 1,6 2,5 28,9 36,6
4 × 35 1,4 4,4 1,7 2,7 32,5 41,1
4 × 50 1,6 4,8 1,9 2,9 37,7 47,5
4 × 70 1,6 5,2 2,0 3,2 42,7 54,0
4 × 95 1,8 5,9 2,3 3,6 48,4 61,0
4 × 120 1,8 6,0 2,4 3,6 53,0 66,0
4 × 150 2,0 6,5 2,6 3,9 58,0 73,0
5 × 1 0,8 1,6 – – 10,2 13,1
5 × 1,5 0,8 1,8 – – 11,2 14,4
5 × 2,5 0,9 2,0 – – 13,3 17,0
5 × 4 1,0 2,2 – – 15,6 19,9
5 × 6 1,0 2,5 – – 17,5 22,2
5 × 10 1,2 3,6 – – 22,9 29,1
5 × 16 1,2 3,9 1,5 2,4 26,4 33,3
5 × 25 1,4 4,4 1,7 2,7 32,0 40,4
a
The mean overall dimensions diameters have been calculated in accordance with IEC 60719.
b
In case of extension of cross sectional area, the thickness of sheath shall be calculated according to
IEC 60245-1:2026, Annex B.
Table 6 – Tests for type 60245 IEC 66
Category
a
Ref. No. Tests Test methods
of test
1 Electrical tests
1.1 Resistance of conductors T, S 60245-2 2.1 IEC 63294:2021, 5.1
1.2 Voltage test on cores at 2 500 V T 60245-2 2.2 IEC 63294:2021, 5.3
1.3 Voltage test on completed cable at 2 500 V T, S 60245-2 2.3 IEC 63294:2021, 5.2
2 Provisions covering constructional and dimensional IEC 60245-1 and
characteristics 60245-2 IEC 63294:2021
2.1 Checking of compliance with constructional provisions T, S IEC 60245-1 Inspection and manual
tests
2.2 Measurement of thickness of insulation T, S 60245-2 1.9 IEC 63294:2021, 6.2
2.3 Measurement of thickness of sheath T, S 60245-2 1.10 IEC 63294:2021, 6.3
2.4 Measurement of overall diameter:
2.4.1 mean value T, S 60245-2 1.11 IEC 63294:2021, 6.4
2.4.2 ovality T, S 60245-2 1.11 IEC 63294:2021, 6.4
3 Mechanical properties of insulation
3.1 Tensile test before ageing T 60811-1-1 9.1 IEC 60811-501
3.2 Tensile test after ageing in the air oven T 60245-2 Clause 4 IEC 60811-401 and
EC 60811-501
3.3 Tensile test after ageing in the air bomb T 60811-1-2 8.2 IEC 60811-412 and
IEC 60811-501
3.4 Hot set test T 60811-2-1 Clause 9 IEC 60811-507
3.5 Ozone resistance test T 60811-2-1 Clause 8 IEC 60811-403
4 Mechanical properties of sheath
4.1 Tensile test before ageing T 60811-1-1 9.2 IEC 60811-501
4.2 Tensile test after ageing in the air oven T 60811-1-2 8.1.3.1 IEC 60811-401 and
IEC 60811-501
4.3 Tensile test after immersion in oil T 60811-2-1 Clause 10 IEC 60811-404
4.4 Hot set test T 60811-2-1 Clause 9 IEC 60811-507
5 Mechanical strength of completed cable
5.1 Flexing test followed, after immersion in water, by a
voltage test:
at 2 000 V on completed cable having not more than T 60245-2 3.1 and 2.2 IEC 63294:2021,
two cores 6.6 and EC 63294:2021, 5.2 and
IEC 60245-1:2026,6.6.3.1
at 2 000 V on cores for cables having more than two T 60245-2 3.1 and 2.3 IEC 63294:2021,
cores 6.6 and IEC 63294:2021, 5.3 and
IEC 60245-1: 2026,6.6.3.1
6 Tests at low temperature (see also 5.4)
6.1 Bending test for sheath T 60811-1-4 8.2 IEC 60811-504
b
6.2 T 60811-1-4 8.4 IEC 60811-505
Elongation test for sheath
a
All documents cited in this table refer to the dated editions that are listed in the normative refer
...