IEC 60227-7
®
Edition 2.0 2024-02
INTERNATIONAL
STANDARD
iTeh Standards
Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V –
(https://standards.iteh.ai)
Part 7: Flexible cables screened and unscreened with two or more conductors
and of rated voltages up to and including 300/500 V
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IEC 60227-7:2024-02(en)
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IEC 60227-7
®
Edition 2.0 2024-02
INTERNATIONAL
STANDARD
iTeh Standards
Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V –
(https://standards.iteh.ai)
Part 7: Flexible cables screened and unscreened with two or more conductors
and of rated voltages up to and including 300/500 V
Document Preview
IEC 60227-7:2024
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INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20 ISBN 978-2-8322-8270-0
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
–2– IEC 60227-7:2024 © IEC 2024
CONTENTS
FOREWORD ........................................................................................................................... 3
INTRODUCTION ..................................................................................................................... 5
1 Scope .............................................................................................................................. 6
2 Normative references ...................................................................................................... 6
3 Terms and definitions ...................................................................................................... 7
4 Oil resistant, polyvinyl chloride sheathed, screened and unscreened flexible cable .......... 8
4.1 Code designation .................................................................................................... 8
4.2 Rated voltage ......................................................................................................... 8
4.3 Construction ........................................................................................................... 8
4.3.1 Conductors ...................................................................................................... 8
4.3.2 Insulation ......................................................................................................... 8
4.3.3 Assembly of cores and fillers, if any ................................................................. 8
4.3.4 Inner sheath for screened cables ..................................................................... 8
4.3.5 Screen ............................................................................................................. 9
4.3.6 Sheath or oversheath ...................................................................................... 9
4.3.7 Core identification .......................................................................................... 10
4.3.8 Overall diameter ............................................................................................ 10
4.4
4.4.1 iTeh Standards
Tests .................................................................................................................... 10
General ......................................................................................................... 10
4.4.2
4.5
(https://standards.iteh.ai)
Flexing test .................................................................................................... 10
Guidance on use ................................................................................................... 11
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Bibliography .......................................................................................................................... 15
Table 1 – Mass of weight and diameter of pulleys ................................................................. 10
IEC 60227-7:2024
Table 2 – General data for type 60227 IEC 74 ...................................................................... 12
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Table 3 – General data for type 60227 IEC 75 ...................................................................... 13
Table 4 – Tests for types 60227 IEC 74 and 60227 IEC 75 ................................................... 14
IEC 60227-7:2024 © IEC 2024 –3–
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POLYVINYL CHLORIDE INSULATED CABLES
OF RATED VOLTAGES UP TO AND INCLUDING 450/750 V –
Part 7: Flexible cables screened and unscreened with two or more
conductors and of rated voltages up to and including 300/500 V
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,
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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.
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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
IEC 60227-7:2024
services carried out by independent certification bodies.
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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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60227-7 has been prepared by IEC technical committee 20: Electric cables. It is an
International Standard.
This second edition cancels and replaces the first edition published in 1995, Amendment 1:2003
and Amendment 2:2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the reference to tests according to IEC 60227-2 has been withdrawn and replaced with a
reference to IEC 63294;
b) normative references have been updated.
–4– IEC 60227-7:2024 © IEC 2024
The text of this International Standard is based on the following documents:
Draft Report on voting
20/2144/FDIS 20/2157/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.
A list of all parts in the IEC 60227 series, published under the general title Polyvinyl chloride
insulated cables of rated voltages up to and including 450/750 V can be found on the IEC
website.
This document is to be used in conjunction with IEC 60227-1.
The committee has decided that the contents of this document will remain unchanged until the
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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, (https://standards.iteh.ai)
• withdrawn, or
• revised. Document Preview
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IEC 60227-7:2024 © IEC 2024 –5–
INTRODUCTION
The IEC 60227 series, published under the general title Polyvinyl chloride insulated cables of
rated voltages up to and including 450/750 V, consists of the following parts:
IEC 60227-1: General requirements;
IEC 60227-2: Test methods (withdrawn and replaced by IEC 63294);
IEC 60227-3: Non-sheathed cables for fixed wiring;
IEC 60227-4: Sheathed cables for fixed wiring;
IEC 60227-5: Flexible cables (cords);
IEC 60227-6: Lift cables and cables for flexible connections;
IEC 60227-7: Flexible cables screened and unscreened with two or more conductors and of
rated voltages up to and including 300/500 V.
This part of IEC 60227, when used in conjunction with IEC 60227-1, forms the complete
standard for flexible cables screened and unscreened with two or more conductors and of rated
voltages up to and including 300/500 V only.
iTeh Standards
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–6– IEC 60227-7:2024 © IEC 2024
POLYVINYL CHLORIDE INSULATED CABLES
OF RATED VOLTAGES UP TO AND INCLUDING 450/750 V –
Part 7: Flexible cables screened and unscreened with two or more
conductors and of rated voltages up to and including 300/500 V
1 Scope
This part of IEC 60227 details the particular specifications for polyvinyl chloride insulated,
screened and unscreened control cables of rated voltages up to and including 300/500 V.
This document provides the particular requirements for screened and unscreened control
cables of rated voltages up to and including 300/500 V, which apply in addition to the
appropriate requirements specified in IEC 60227-1, which apply to all cables. The tests for
cables specified in the IEC 60227 series are described in IEC 63294.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
iTeh Standards
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.(https://standards.iteh.ai)
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IEC 60227-1, Polyvinyl chloride insulated cables of rated voltages up
450/750 V – Part 1: General requirements
to and including
IEC 60228, Conductors of insulated cables
IEC 60227-7:2024
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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
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 60811-404, 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 60811-504, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 504: 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 –
Part 505: Mechanical tests – Elongation at low temperature for insulations and sheaths
IEC 60227-7:2024 © IEC 2024 –7–
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 60811-508, 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 60502-1:2021, 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) – Part 1: Cables for rated voltages
of 1 kV (U m = 1,2 kV) and 3 kV (U m = 3,6 kV)
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 62153-4-3:2013, Metallic communication cable test methods – Part 4-3: Electromagnetic
compatibility (EMC) – Surface transfer impedance – Triaxial method
IEC 63294:2021, Test methods for electric cables with rated voltages up to and including
450/750 V
3 Terms and definitions
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For the purposes of this document, the terms and definitions given in IEC 60227-1 and the
following apply.
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ISO and IEC maintain terminology databases for use in standardization at the following
addresses: IEC 60227-7:2024
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• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
type test
test made 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 made, it is not necessary for them to be
repeated, unless changes are made in the cable materials or design which can change the performance
characteristics.
Note 2 to entry: The symbol T is used to refer to type tests.
3.2
sample test
test made on samples of completed cable or components taken from a completed cable to verify
that the finished product meets the design standards
Note 1 to entry: The symbol S is used to refer to sample tests.
–8– IEC 60227-7:2024 © IEC 2024
4 Oil resistant, polyvinyl chloride sheathed, screened and unscreened
flexible cable
4.1 Code designation
60227 IEC 74 for screened cables;
60227 IEC 75 for unscreened cables.
4.2 Rated voltage
300/500 V.
4.3 Construction
4.3.1 Conductors
Number of conductors: 2 to 60.
Preferred number of conductors: 2, 3, 4, 5, 6, 7, 12, 18, 27, 36, 48 and 60.
The conductors shall comply with the requirements given in IEC 60228 for class 5 conductors.
4.3.2 Insulation
The insulation shall be polyvinyl chloride compound of type PVC/D (see IEC 60227-1) applied
around each conductor.
iTeh Standards
The specified value of the insulation thickness is given in Table 2, column 2 and Table 3,
column 2. The insulation resistance shall be not less that the value given in Table 2, column 8
(https://standards.iteh.ai)
or Table 3, column 6.
4.3.3 Document
Assembly of cores and fillers, if any Preview
The cores shall be twisted together, where appropriate in several concentric layers.
IEC 60227-7:2024
A centre core is not permitted but a centre filler of suitable material shall be applied for cables
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with five or more cores in the first layer. Assemblies with three or more cores shall have one
core which is coloured green-and-yellow.
Around each layer a tape may be applied which can cover the cores fully or partially. The tape
shall not adhere to the cores.
For two-core cables, the space between the cores shall be filled either by separate fillers or by
the sheath filling the interstices.
4.3.4 Inner sheath for screened cables
The inner sheath shall be a polyvinyl chloride compound of type PVC/ST5 (see IEC 60227-1)
applied around the core assembly. For all cables, the thickness of the inner sheath shall be
determined by the formula:
t is = 0,02 D f + 0,6 mm,
where D f is the fictitious diameter over the laid-up core, calculated in accordance with
IEC 60502-1:2021, A.3.1, A.3.2 and A.3.3, and where the fictitious diameter (d l ) of 0,5 mm 2 ,
0,75 mm 2 and 1,0 mm 2 conductors (not given in IEC 60502-1:2021, A.3.1) shall be taken to be
0,8 mm, 1,0 mm and 1,1 mm, respectively.
For cables with the preferred number of cores, the calculated values of the inner sheath
thickness are given in Table 2, column 3.
