IEC 62821-3:2015

Electric cables - Halogen-free, low smoke, thermoplastic insulated and sheathed cables of rated voltages up to and including 450/750 V - Part 3: Flexible cables (cords)

IEC 62821-3:2015 applies to flexible cables for connection to appliances, insulated and sheathed with halogen-free thermoplastic compound and having low emission of smoke and corrosive gases when exposed to fire. The cables are of rated voltages up to and including 300/500 V. Circular cables and flat cables are included.
This publication is to be read in conjunction with IEC 62821-1:2015.

Câbles électriques - Câbles à isolation et gaine thermoplastique sans halogène à faible dégagement de fumée de tension assignée au plus égale à 450/750 V - Partie 3: Câbles souples (cordons)

L'IEC 62821-3:2015 s'applique aux câbles souples destinés à être raccordés à des appareils, à isolation et gaine à base de mélanges thermoplastiques sans halogène et à faible dégagement de fumée et de gaz corrosifs en cas d'exposition au feu. Les câbles sont de tension assignée au plus égale à 300/500 V. Sont inclus les câbles circulaires et les câbles méplats.
Cette publication doit être lue conjointement avec la CEI 62821-1:2015.

General Information

• Status: Published
• Publication Date: 12-Feb-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.060.20 - Cables
• Technical Committee: TC 20 - Electric cables
• Drafting Committee: WG 17 - TC 20/WG 17
• Current Stage: PPUB - Publication issued
• Start Date: 13-Feb-2015
• Completion Date: 15-Feb-2015

Overview

IEC 62821-3:2015 is an international standard developed by the International Electrotechnical Commission (IEC) focusing on halogen-free, low smoke, thermoplastic insulated and sheathed flexible electric cables (cords). This part of the IEC 62821 series specifically covers cables with rated voltages up to and including 300/500 V designed for connecting electrical appliances. The standard ensures that these cables exhibit low smoke emission and minimal release of corrosive gases during fire exposure, providing enhanced safety in residential, commercial, and industrial environments.

The cables covered by this standard include both circular and flat constructions, with special attention to operational reliability and fire safety. The maximum conductor operating temperature limit for these cables is 70 °C. This standard supports the implementation of safe and environmentally responsible electrical wiring solutions.

Key Topics

• Scope and Definitions: IEC 62821-3 sets requirements for flexible cables insulated and sheathed with halogen-free thermoplastic compounds. It applies to light duty and ordinary duty flexible cables for appliance connections with rated voltages of up to 300/500 V.

• Construction Requirements:

  • Conductors: Must comply with Class 5 flexibility requirements (IEC 60228) for conductors.
  • Cable Sizes: For circular cables, cross-sectional areas from 0.5 mm² to 0.75 mm² with 2-4 cores, and for flat cables, 0.5 mm² and 0.75 mm² with 2 cores.
  • Insulation: Made from halogen-free, low smoke (LSHF/D) thermoplastic compounds adhering to IEC 62821-1.
  • Sheath: Thermoplastic halogen-free sheath complying with LSHF/ST1 properties, ensuring low smoke and corrosion emissions.
  • Assembly: Circular cables have twisted cores while flat cables use parallel cores; an optional halogen-free tape can be applied around the assembly.

• Identification and Marking: Cables must bear clear markings such as "62821 IEC 101" for circular cables and "62821 IEC 101f" for flat cables, consistent with IEC 62821-1 labeling requirements.

• Test Methods and Compliance:

  • Smoke emission testing follows IEC 61034-2 to verify low smoke density.
  • Corrosion and halogen absence are assessed per IEC 62821-1 guidelines.
  • Mechanical, thermal, and electrical properties are verified via mandated procedures outlined in the standard’s annexes.
  • Surface resistance and dimensional compliance are mandatory, with surfaces required to exceed a 10 Ω resistance minimum.

Applications

IEC 62821-3:2015 flexible cables have widespread use in:

• Electrical Appliances: Ideal for power cords and flexible connections used in domestic and office appliances where fire safety is paramount.
• Building Installations: Used where stringent low smoke and halogen-free cable properties are mandated by fire safety codes, reducing toxic gas emissions in case of fire.
• Commercial Equipment: Power cords for equipment requiring durable, flexible, fire-resistant wiring.
• Transport and Leisure Vehicles: Suitable for cable applications requiring halogen-free and low smoke properties for passenger safety.

The standard supports manufacturers, electrical contractors, and safety inspectors by providing clear guidelines on producing and selecting flexible cables that minimize health and safety hazards during fire incidents.

Related Standards

• IEC 62821-1:2015 – General requirements for halogen-free, low smoke thermoplastic insulated and sheathed cables with rated voltages up to 450/750 V.
• IEC 60228 – Specification for conductors of insulated cables, covering conductor classes including flexible wires.
• IEC 61034-2 – Test procedure for measuring smoke density of cables exposed to fire.
• IEC 62821-2 – Test methods for halogen-free, low smoke thermoplastic insulated cables.
• IEC 62440 – Guidelines on the safe use of electric cables covered under this voltage rating and type.

Compliance with these standards ensures the production of cables that meet global safety, fire resistance, and environmental criteria, aiding international trade and adherence to regulatory requirements.

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Keywords: IEC 62821-3, flexible cables, halogen-free cables, low smoke cables, thermoplastic insulated cables, appliance cords, rated voltage 300/500 V, fire safe cables, cable smoke density, halogen-free thermoplastic sheath, IEC standards for cables, electrical safety standards.

Standards Content (Sample)

IEC 62821-3 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric cables – Halogen-free, low smoke, thermoplastic insulated and sheathed
cables of rated voltages up to and including 450/750 V –
Part 3: Flexible cables (cords)

Câbles électriques – Câbles à isolation et gaine thermoplastique sans halogène
à faible dégagement de fumée de tension assignée au plus égale à 450/750 V –
Partie 3: Câbles souples (cordons)
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IEC 62821-3 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric cables – Halogen-free, low smoke, thermoplastic insulated and sheathed

cables of rated voltages up to and including 450/750 V –

Part 3: Flexible cables (cords)

Câbles électriques – Câbles à isolation et gaine thermoplastique sans halogène

à faible dégagement de fumée de tension assignée au plus égale à 450/750 V –

Partie 3: Câbles souples (cordons)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.20 ISBN 978-2-8322-2254-6

– 2 – IEC 62821-3:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 General purpose cables . 6
4.1 Light duty, halogen-free, low smoke flexible cables . 6
4.1.1 Code designation . 6
4.1.2 Rated voltage . 6
4.1.3 Construction . 6
4.1.4 Requirements . 7
4.2 Ordinary duty, halogen-free, low smoke flexible cables . 7
4.2.1 Code designation . 7
4.2.2 Rated voltage . 7
4.2.3 Construction . 7
4.2.4 Requirements . 8
Annex A (normative) Tests for cables of type 62821 IEC 101, 101f, 102, 102f. 9
Annex B (normative) Tables for cable dimension and insulation resistance . 11
Annex C (normative) Requirements for compatibility test . 13
C.1 Test conditions . 13
C.2 Requirements . 13
Bibliography . 14

Table A.1 – List of tests related to cable types . 9
Table B.1 – General data for type 101 and 101f . 11
Table B.2 – General data for type 102 and 102f . 12
Table C.1 – Requirements for compatibility test . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC CABLES –HALOGEN-FREE, LOW SMOKE, THERMOPLASTIC
INSULATED AND SHEATHED CABLES OF RATED VOLTAGES
UP TO AND INCLUDING 450/750 V –

Part 3: Flexible cables (cords)

FOREWORD
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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.
International Standard IEC 62821-3 has been prepared by IEC technical committee 20:
Electric cables. The text of this standard is based on the following documents:
FDIS Report on voting
20/1552A/FDIS 20/1565/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This part of IEC 62821 should be read in conjunction with IEC 62821-1, which specifies
general requirements.
– 4 – IEC 62821-3:2015 © IEC 2015
A list of all parts in the IEC 62821 series, published under the general title, Electric cables –
Halogen-free, low smoke, thermoplastic insulated and sheathed cables of 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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
ELECTRIC CABLES –HALOGEN-FREE, LOW SMOKE, THERMOPLASTIC
INSULATED AND SHEATHED CABLES OF RATED VOLTAGES
UP TO AND INCLUDING 450/750 V –

Part 3: Flexible cables (cords)

1 Scope
This part of IEC 62821 applies to flexible cables for connection to appliances, insulated and
sheathed with halogen-free thermoplastic compound and having low emission of smoke and
corrosive gases when exposed to fire.
NOTE For some types of flexible cables, the term "cord" is used.
Low emission of smoke is checked in accordance with IEC 61034-2. Low emission of
corrosive gases is checked as part of the check for absence of halogens (see Annex B of
IEC 62821-1:2015).
The cables are of rated voltages U /U up to and including 300/500 V.
Circular cables and flat cables are included.
The maximum conductor operating temperature for each of the cables in this standard is
70 °C.
IEC 62440 should be used as guidance on the safe use of cables in this standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60227-2, Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V – Part 2: Test methods
IEC 60228, Conductors of insulated cables
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 60811-506, 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 61034-2, Measurement of smoke density of cables burning under defined conditions –
Part 2: Test procedure and requirements

– 6 – IEC 62821-3:2015 © IEC 2015
IEC 62440, Electrical cables with a rated voltage not exceeding 450/750 V – Guide to use
IEC 62821-1:2015, Electric cables – Halogen-free low smoke thermoplastic insulated and
sheathed cables of rated voltage up to and including 450/750 V – Part 1: General
requirements
IEC 62821-2, Electric cables – Halogen-free low smoke thermoplastic insulated and sheathed
cables of rated voltage up to and including 450/750 V – Part 2: Test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62821-1 apply.
4 General purpose cables
4.1 Light duty, halogen-free, low smoke flexible cables
4.1.1 Code designation
62821 IEC 101 for circular cable and 62821 IEC 101f for flat cable.
4.1.2 Rated voltage
• 300/300 V
4.1.3 Construction
4.1.3.1 Conductor
The conductor shall comply with Class 5, according to IEC 60228.
4.1.3.2 Sizes of cable
The sizes of cable shall be:
2 2
a) circular cable: 0,5 mm and 0,75 mm – 2, 3 and 4 core;
2 2
b) flat cable: 0,5 mm and 0,75 mm – 2 core only.
4.1.3.3 Insulation
The insulation shall be thermoplastic compound of LSHF/D to IEC 62821-1.
4.1.3.4 Assembly
The cores shall be assembled as follows:
a) circular cable: the cores shall be twisted together;
b) flat cable: the cores shall be laid parallel.
A halogen-free tape may be applied around the core assembly before application of the
sheath.
4.1.3.5 Sheath
The sheath shall be a thermoplastic compound of Type LSHF/ST1 to IEC 62821-1.
The sheath shall not adhere to the cores. The assembly of cores may be surrounded by a
separator which shall not adhere to the cores.

For circular cables, the application of the sheath shall give the finished cable a practically
circular shape.
4.1.3.6 Marking
The circular cable shall be marked with the code 62821 IEC 101, and the flat cable shall be
marked with the code 62821 IEC 101f.
The marking shall comply with Clause 5 of IEC 62821-1:2015.
4.1.4 Requirements
Each cable shall comply with the appropriate requirements given in IEC 62821-1 and the
particular requirements of this standard.
Testing shall be in accordance with Annex A, and the relevant tests indicated in Column 6 in
Table A.1.
a) The surface resistance of sheath shall comply with the minimum requirement of 10 Ω.
b) The dimensions of the cables shall conform to Table B.1 for type 101 and 101f.
c) The requirements to be met for the compatibility test shall be as given in Annex C.
d) When tested in accordance with the method and procedure given in IEC 61034-2, all sizes
of cable shall exceed 60 % light transmittance throughout the test.
4.2 Ordinary duty, halogen-free, low smoke flexible cables
4.2.1 Code designation
62821 IEC 102 for circular cable and 62821 IEC 102f for flat cable.
4.2.2 Rated voltage
• 300/500 V
4.2.3 Construction
4.2.3.1 Conductor
The conductor shall comply with Class 5, according to IEC 60228.
4.2.3.2 Sizes of cable
The sizes of cable shall be:
2 2
a) circular cable: 0,75 mm to 4 mm – 2, 3, 4 and 5 core
2 2
b) flat cable: 0,75 mm and 1,0 mm – 2 core only.
4.2.3.3 Insulation
The insulation shall be thermoplastic compound of Type LSHF/D to IEC 62821-1.
4.2.3.4 Assembly
The cores shall be assembled as follows:
a) circular cable: the cores, and the fillers if any, shall be twisted together.
b) flat cable: the cores shall be laid parallel.
For cable having two cores, the space between the cores shall be filled either by separate
halogen-free fillers or by the sheath filling the interstices.

– 8 – IEC 62821-3:2015 © IEC 2015
For circular cables with 3, 4 or 5 cores, a central halogen-free filler may be used.
A halogen-free tape may be applied around the core assembly before application of the
sheath.
4.2.3.5 Sheath
The sheath shall be thermoplastic compound of LSHF/ST1 to IEC 62821-1.
The sheath shall not adhere to the cores. The assembly of cores may be surrounded by a
separator which shall not adhere to the cores.
For circular cables, the application of the sheath shall give the finished cable a practically
circular shape.
4.2.3.6 Marking
The circular cable shall be marked with the code 62821 IEC 102, and the flat cable shall be
marked with the code 62821 IEC 102f.
The marking shall comply with Clause 5 of IEC 62821-1:2015.
4.2.4 Requirements
Each cable shall comply with the appropriate requirements given in IEC 62821-1, and the
particular requirements of this standard.
Testing shall be in accordance with Annex A, and the relevant tests indicated in Column 7 in
Table A.1.
a) The surface resistance of the sheath shall comply the minimum requirement of 10 Ω.
b) The dimensions of the cables shall conform to Table B.2 for Type 102 and 102f.
c) The requirements to be met for the compatibility test shall be as given in Annex C.
d) When tested in accordance with the method and procedure given in IEC 61034-2, a value
of 60 % cable light transmittance is adopted as a minimum for all sizes of cable
throughout the test.
Annex A
(normative)
Tests for cables of type 62821 IEC 101, 101f, 102, 102f
Table A.1 – List of tests related to cable types
1 2 3 4 5 6 7
a
Ref Tests Category Test method Applicability of test –
No. of test described in Subclause
IEC Clause/ 4.1 4.2
standard subclause
62821 62821
IEC 101 IEC 102
and and
IEC 101f IEC 102f
b
1 Electrical tests
1.1 Resistance of conductors T, S 60227-2 2.1 X X
1.2 Voltage test on completed cable at 2 000 V T, S 60227-2 2.2 X X
1.3 Voltage test on cores according to specified
T, S 60227-2 2.3
insulation thickness:
1.3.1 - at 1 500 V for insulation thickness up to
X X
and including 0,6 mm
1.3.2 - at 2 000 V for insulation thickness above
– X
0,6 mm
1.4 Insulation resistance at 70 °C T, S 60227-2 2.4 X X
1.5 Long term resistance of insulation to d.c. T 62821-2 5.1.1 X X

1.6 Absence of faults in insulation R 62821-2 5.1.2 X X
1.7 Surface resistance of sheath T 62821-2 5.1.3 X X
2 Constructional and dimensional tests
2.1 Checking of compliance with constructional
T, S 62821-1 X X
provisions
2.2 Measurement of thickness of insulation T, S 60227-2 1.9 X X
2.3 Measurement of thickness of sheath T, S 60227-2 1.10 X X
2.4 Measurement of overall dimensions
2.4.1 Mean value T, S 60227-2 1.10.2 X X
e e
2.4.2 Ovality T, S 60227-2 1.11 X X
c
3 Insulation material tests T 62821-1 LSHF/D X X
c
4 Sheath material tests
T 62821-1 LSHF/ST1 X X
5 Compatibility test T 60811-401 X X
6 Impact test at –15 °C T 60811-506 X X
d
7 Mechanical strength of completed cable
Flexing test followed, after immersion in 60227-2 3 X X
T
water, by a voltage test at 2 000 V on cores
62821-2 5.1.4 X X
8 Tests under fire conditions
8.1 Test on single vertical cable T 60332-1-2 – X X
8.2 Smoke emission T 61034-2 – X X

– 10 – IEC 62821-3:2015 © IEC 2015
Table A.1 – List of tests related to cable types (concluded)
1 2 3 4 5 6 7
a
Ref Tests Category Test method Applicability of test –
No. of test described in Subclause
IEC Clause/ 4.1 4.2
standard subclause
62821 62821
IEC 101 IEC 102
and and
IEC 101f IEC 102f
9 Assessment of halogens for all non-
T, S 62821-1 Annex B X X
metallic materials
a
The order given does not imply a sequence of testing.
b
Particular test conditions and requirements are given in Table 3 of IEC 62821-1:2015.
c
This standard includes all the test methods and requirements for the material. Material to be tested is taken from the
finished cable.
d 2
Not applicable to cables having conductors greater than 2,5 mm .
e
Not applicable for flat cables.

Annex B
(normative)
Tables for cable dimension and insulation resistance
NOTE The overall dimensions of cables have been calculated in accordance with IEC 60719.
Table B.1 – General data for type 101 and 101f
1 2 3 4 5 6
Number and Thickness of Thickness of Mean overall dimensions Minimum
nominal cross- insulation sheath insulation
Lower limit Upper limit
sectional area resistance at
Specified value Specified value
of conductors 70 °C
mm mm mm mm mm MΩ × km
4,6 5,9
or or
2 × 0,5 0,5 0,6 0,012
3,0 × 4,9 3,7 × 5,9
4,9 6,3
2 × 0,75 0,5 0,6 or or 0,010
3,2 × 5,2 3,8 × 6,3
3 × 0,5 0,5 0,6 4,9 6,3 0,011
3 × 0,75 0,5 0,6 5,2 6,7 0,010
0,5 0,6 5,4 6,9 0,011
4 × 0,5
4 × 0,75 0,5 0,6 5,7 7,3 0,010

– 12 – IEC 62821-3:2015 © IEC 2015
Table B.2 – General data for type 102 and 102f
1 2 3 4 5 6
Number and
...