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®
IEC 60502-1
Edition 3.0 2021-02
INTERNATIONAL
STANDARD
Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) –
Part 1: Cables for rated voltages of 1 kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20
ISBN 978-2-8322-9315-7
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
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IEC 60502-1:2021 © IEC 2021
CONTENTS
FOREWORD ........................................................................................................................... 4
1
Scope .............................................................................................................................. 6
2
Normative references ...................................................................................................... 6
3
Terms and definitions ...................................................................................................... 8
4
Voltage designations and materials ................................................................................. 9
5
Conductors .................................................................................................................... 12
6
Insulation ....................................................................................................................... 12
7
Assembly of multicore cables, inner coverings and fillers ............................................... 14
8
Metal layers for single-core and multicore cables........................................................... 16
9
Metal screen .................................................................................................................. 16
10
Concentric conductor ..................................................................................................... 17
11
Metal sheath .................................................................................................................. 17
12
Metal armour ................................................................................................................. 17
13
Oversheath .................................................................................................................... 21
14
Test conditions .............................................................................................................. 22
15
Routine tests ................................................................................................................. 22
16
Sample tests ................................................................................................................. 24
17
Type tests, electrical...................................................................................................... 27
18
Type tests, non-electrical ............................................................................................... 29
19
Electrical tests after installation ..................................................................................... 35
Annex A (normative) Fictitious calculation method for determination of dimensions of
protective coverings .............................................................................................................. 45
Annex B (normative) Rounding of numbers .......................................................................... 51
Annex C (normative) Determination of hardness of HEPR insulation .................................... 52
Bibliography .......................................................................................................................... 55
Figure C.1 – Test on surfaces of large radius of curvature .................................................... 53
Figure C.2 – Test on surfaces of small radius of curvature .................................................... 54
Table 1 – Recommended rated AC voltages U 0 .................................................................... 10
Table 2 – Insulating compounds ............................................................................................ 11
Table 3 – Maximum conductor temperatures for different types of insulating compound ........ 11
Table 4 – Sheathing compounds and maximum conductor temperatures for different
types of sheathing compound ............................................................................................... 12
Table 5 – Nominal thickness of PVC/A insulation .................................................................. 13
Table 6 – Nominal thickness of cross-linked polyethylene (XLPE) insulation ......................... 13
Table 7 – Nominal thickness of ethylene propylene rubber (EPR) and hard ethylene
propylene rubber (HEPR) insulation ...................................................................................... 14
Table 8 – Thickness of extruded inner covering .................................................................... 15
Table 9 – Nominal diameter of round armour wires ............................................................... 20
Table 10 – Nominal thickness of armour tapes ...................................................................... 20
Table 11 – Routine test voltages ........................................................................................... 23
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Table 12 – Number of samples for sample tests .................................................................... 24
Table 13 – Electrical type test requirements for insulating compounds .................................. 36
Table 14 – Non-electrical type tests (see Tables 15 to 23) ................................................... 37
Table 15 – Test requirements for mechanical characteristics of insulating compounds
(before and after ageing) ...................................................................................................... 38
Table 16 – Test requirements for particular characteristics of PVC insulating
compounds ........................................................................................................................... 39
Table 17 – Test requirements for particular characteristics of various cross-linked
insulating compounds ........................................................................................................... 40
Table 18 – Test requirements for mechanical characteristics of sheathing compounds
(before and after ageing) ...................................................................................................... 41
Table 19 – Test requirements for particular characteristics of PVC sheathing
compounds ........................................................................................................................... 42
Table 20 – Test requirements for particular characteristics of thermoplastic PE
sheathing compounds ........................................................................................................... 43
Table 21 – Test requirements for particular characteristics of halogen free sheathing
compounds ........................................................................................................................... 43
Table 22 – Test requirements for particular characteristics of elastomeric sheathing
compounds ........................................................................................................................... 44
Table 23 – Test methods and requirements for halogen free compounds .............................. 44
Table A.1 – Fictitious diameter of conductor ......................................................................... 46
Table A.2 – Assembly coefficient k for laid-up cores ............................................................. 47
Table A.3 – Increase of diameter for concentric conductors and metal screens ..................... 48
Table A.4 – Increase of diameter for additional bedding ........................................................ 50
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IEC 60502-1:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER CABLES WITH EXTRUDED INSULATION
AND THEIR ACCESSORIES FOR RATED VOLTAGES
FROM 1 kV (U m = 1,2 kV) UP TO 30 kV (Um = 36 kV) –
Part 1: Cables for rated voltages of 1 kV
(U m = 1,2 kV) and 3 kV (U m = 3,6 kV)
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60502-1 has been prepared by IEC technical committee 20: Electric cables. It is an
International Standard.
This third edition cancels and replaces the second edition published in 2004 and
Amendment 1:2009. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) references to IEC 60811 (all parts) have been updated and mechanical testing requirements
specific to halogen free low-smoke oversheath of material type ST 8 have been considered;
b) the use of the types of sheathing material to be used is now clearly defined;
c) the applicability of cables for use in DC systems is now included in the scope;
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d) items which were earlier marked as "under consideration" were studied either for an
appropriate solution if found available, or for removal for the time being.
The text of this International Standard is based on the following documents:
Draft
Report on voting
20/1938/FDIS
20/1949/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/standardsdev/publications.
A list of all parts in the IEC 60502 series, published under the general title Power cables with
extruded insulation and their accessories for rated voltages from 1 kV (U m = 1,2 kV) up to 30 kV
(U m = 36 kV) 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 "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
•
reconfirmed,
•
withdrawn,
•
replaced by a revised edition, or
•
amended.
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IEC 60502-1:2021 © IEC 2021
POWER CABLES WITH EXTRUDED INSULATION
AND THEIR ACCESSORIES FOR RATED VOLTAGES
FROM 1 kV (U m = 1,2 kV) UP TO 30 kV (Um = 36 kV) –
Part 1: Cables for rated voltages of 1 kV
(U m = 1,2 kV) and 3 kV (U m = 3,6 kV)
1
Scope
This part of IEC 60502 specifies the construction, dimensions and test requirements of power
cables with extruded solid insulation for rated AC voltages of 1 kV (U m = 1,2 kV) and 3 kV
(U m = 3,6 kV) for fixed installations such as distribution networks or industrial installations.
Cables of rated AC voltage 1 kV (U m = 1,2 kV) designed and tested in accordance with this
document can also be used, if declared by the manufacturer, in DC distribution systems having
their nominal voltage ≤ 750 V DC (with a maximum of 900 V DC) between a live conductor and
neutral/earth, or ≤ 1 500 V DC (with a maximum 1 800 V DC) between two live conductors.
Applicable core identification for DC systems are considered in accordance with local
installation regulations.
NOTE 1 Recommendations for preferred core colours for line conductors in DC systems are given in IEC 60445.
However, local installation regulations for DC systems can already contain specific identification requirements.
This document includes cables which exhibit properties of reduced flame spread, low levels of
smoke emission and halogen-free gas emission when exposed to fire.
Cables for special installation and service conditions are not included, for example cables for
overhead networks, the mining industry, nuclear power plants (in and around the containment
area), submarine use or shipboard application, or cables directly connected to photovoltaic
systems.
NOTE 2
2
Cables for photovoltaic systems are covered by IEC 62930.
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.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60183, Guidance for the selection of high-voltage A.C. cable systems
IEC 60228, Conductors of insulated cables
IEC 60230, Impulse tests on cables and their accessories
IEC 60332-1-2, Tests on electric and optical fibre cables under fire conditions – Part 1-2: Test
for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW
pre ‑ mixed flame
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IEC 60332-3-24, Tests on electric and optical cables under fire conditions – Part 3-24: Test for
vertical flame spread of vertically-mounted bunched wires or cables – Category C
IEC 60684-2, Flexible insulating sleeving – Part 2: Methods of test
IEC 60724, Short-circuit temperature limits of electric cables with rated voltages of 1 kV
(U m = 1,2 kV) and 3 kV (U m = 3,6 kV)
IEC 60754-1, Test on gases evolved during combustion of materials from cables – Part 1:
Determination of the halogen acid gas content
IEC 60754-2, Test on gases evolved during combustion of materials from cables – Part 2:
Determination of acidity (by pH measurement) and conductivity
IEC 60811-201, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 201: General tests – Measurement of insulation thickness
IEC 60811-202, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 202: General tests – Measurement of thickness of non-metallic sheath
IEC 60811-203, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 203: General tests – Measurement of overall dimensions
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 60811-402, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 402: Miscellaneous tests – Water absorption tests
IEC 60811-403, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 403: Miscellaneous tests – Ozone resistance test on cross-linked compounds
IEC 60811-404, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 404: Miscellaneous tests – Mineral oil immersion tests for sheaths
IEC 60811-409, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 409: Miscellaneous tests – Loss of mass test for thermoplastic insulations and sheaths
IEC 60811-501, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 501: Mechanical tests – Tests for determining the mechanical properties of insulating and
sheathing compounds
IEC 60811-502, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 502: Mechanical tests – Shrinkage test for insulations
IEC 60811-503, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 503: Mechanical tests – Shrinkage test for sheaths
IEC 60811-504, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 504: Mechanical tests – Bending tests at low temperature for insulations and sheaths
IEC 60811-505, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 505: Mechanical tests – Elongation at low temperature for insulations and sheaths
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IEC 60811-506, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 506: Mechanical tests – Impact test at low temperature for insulations and sheaths
IEC 60811-507, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 507: Mechanical tests – Hot set test for cross-linked materials
IEC 60811-508, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 508: Mechanical tests – Pressure test at high temperature for insulation and sheaths
IEC 60811-509, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 509: Mechanical tests – Test for resistance of insulations and sheaths to cracking (heat
shock test)
IEC 60811-605, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 605: Physical tests – Measurement of carbon black and/or mineral filler in polyethylene
compounds
IEC 60811-606, Electric and optical fibre cables –Test methods for non-metallic materials –
Part 606: Physical tests – Methods for determining the density
IEC 61034-2, Measurement of smoke density of cables burning under defined conditions –
Part 2: Test procedure and requirements
IEC 62230, Electric cables – Spark-test method
ISO 48-2:2018, Rubber, vulcanized or thermoplastic – Determination of hardness – Part 2:
Hardness between 10 IRHD and 100 IRHD
3
Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
•
IEC Electropedia: available at http://www.electropedia.org/
•
ISO Online browsing platform: available at http://www.iso.org/obp
3.1
Definitions of dimensional values (thicknesses, cross-sections, etc.)
3.1.1
nominal value
value by which a quantity is designated and which is often used in tables
Note 1 to entry: Usually, in this document, nominal values give rise to values to be checked by measurements
taking into account specified tolerances.
3.1.2
approximate value
value which is neither guaranteed nor checked but is used, for example, for the calculation of
other dimensional values