IEC 60320-1:2021

IEC 60320-1 ®
Edition 4.0 2021-07
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Appliance couplers for household and similar general purposes –
Part 1: General requirements
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IEC 60320-1 ®
Edition 4.0 2021-07
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Appliance couplers for household and similar general purposes –
Part 1: General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.30 ISBN 978-2-8322-4048-9
– 2 – IEC 60320-1:2021 CMV © IEC 2021
CONTENTS
FOREWORD .7
1 Scope .9
2 Normative references .9
3 Terms and definitions . 10
4 General requirements . 14
5 General notes on tests . 14
5.1 General . 14
5.2 Test samples . 14
5.3 Failures .
5.3 Routine tests . 15
6 Standard ratings . 15
7 Classification of appliance couplers . 15
8 Marking . 16
8.1 General . 16
8.2 Additional markings . 16
8.3 Appliance couplers for class II equipment . 16
8.4 Symbols or alphanumeric notations . 16
8.5 Legibility of markings . 17
8.6 Terminal markings and wiring instructions . 17
8.7 Durability . 17
8.8 Test and inspection . 17
9 Dimensions and compatibility . 18
9.1 General . 18
9.2 Single‐pole connections . 18
9.3 Compatibility . 18
9.4 Dimensions for standardized appliance couplers . 18
9.5 Dimensions for non-standardized appliance couplers . 18
10 Protection against electric shock . 19
10.1 Accessibility of live parts . 19
10.2 Protection against single pole connection . 19
10.3 Protection against access to live parts . 19
10.4 External parts . 20
10.5 Shrouds . 20
11 Provision for earthing . 20
12 Terminals and terminations . 20
12.1 General . 20
12.2 Rewirable appliance couplers . 20
12.3 Non‐rewirable appliance couplers. 20
13 Construction . 21
13.1 Risk of accidental contact . 21
13.2 Contact positions . 21
13.3 Parts covering live parts . 21
13.4 Pin construction . 21
13.4.1 Prevention of rotation . 21
13.4.2 Pin retention . 21

13.4.3 Non‐solid pins . 22
13.4.4 Pins for appliance couplers for higher ambient temperatures up to +90 °C. 23
13.5 Contact pressure . 23
13.6 Enclosure . 23
13.6.1 General . 23
13.6.2 Rewirable connectors and rewirable plug connectors . 24
13.6.3 Non-rewirable connectors and non-rewirable plug connectors . 24
13.7 Earth connection . 24
13.8 Location of terminals and terminations . 25
13.8.1 General . 25
13.8.2 Free wire test for rewirable accessories . 25
13.8.3 Free wire test for non-rewirable non-moulded-on accessories . 25
13.8.4 Free wire verification for non-rewirable moulded-on accessories . 26
13.9 Connectors/plug connectors without earthing contact . 26
13.10 Fuses, relays, thermostats, thermal cut-outs and switches . 26
14 Moisture resistance . 26
15 Insulation resistance and electric strength . 27
15.1 General . 27
15.2 Insulation resistance . 28
15.3 Dielectric strength. 29
16 Forces necessary to insert and to withdraw the connector/appliance outlet . 30
16.1 General . 30
16.2 Verification of the maximum withdrawal force . 30
16.3 Verification of the minimum withdrawal force . 32
17 Operation of contacts . 33
18 Resistance to heating of appliance couplers for hot conditions or very hot conditions . 33
18.1 General . 33
18.2 Heating test for connectors/plug connectors . 33
18.3 Heating test for appliance inlets/appliance outlets . 34
19 Breaking capacity. 35
20 Normal operation . 36
21 Temperature rise. 37
22 Cords and their connection . 38
22.1 Cords for non-rewirable connectors/plug connectors . 38
22.2 Cord anchorage . 39
22.2.1 General . 39
22.2.2 Additional requirements for rewirable connectors and rewirable plug
connectors . 40
22.2.3 Pull test for cable anchorage. 40
22.3 Flexing test . 42
23 Mechanical strength . 44
23.1 General . 44
23.2 Free fall test . 45
23.3 Lateral pull test for contacts . 45
23.4 Impact test . 48
23.5 Deformation test . 48
23.6 Torque and Pull tests for connectors/plug connectors with a separate front part . 49
23.6.1 General . 49

– 4 – IEC 60320-1:2021 CMV © IEC 2021
23.6.2 Straight pull test . 49
23.6.3 Lateral pull test . 49
24 Resistance to heat and ageing. 50
24.1 Resistance to heat . 50
24.2 Resistance to ageing . 51
24.2.1 General . 51
24.2.2 Ageing test for elastomeric materials . 51
24.2.3 Ageing test for thermoplastic materials . 51
24.2.4 Ageing test assessment . 52
25 Screws, current-carrying parts and connections . 52
25.1 General . 52
25.2 Electrical connections . 53
25.3 Securement of connections . 53
25.4 Metallic parts . 53
26 Clearances, creepage distances and solid insulation . 54
26.1 General . 54
26.2 Clearances . 54
26.2.1 Dimensioning . 54
26.2.2 Minimum values for clearances . 55
26.3 Creepage distances . 56
26.3.1 Dimensioning . 56
26.3.2 Minimum creepage distances . 56
26.4 Solid insulation . 57
27 Resistance of insulating material to heat, fire and tracking . 58
27.1 Resistance to heat and fire . 58
27.1.1 General . 58
27.1.2 Objective of the test. 58
27.1.3 General description of the test . 58
27.1.4 Description of test apparatus .
27.1.4 Degree of severity . 58
27.1.5 Evaluation of test results . 59
27.1.6 Verification of the thermocouple .
27.1.7 Preconditioning .
27.1.8 Initial measurements .
27.1.9 Test procedure .
27.1.10 Observations and measurements .
27.2 Resistance to tracking . 59
28 Resistance to rusting. 59
29 Electromagnetic compatibility (EMC) requirements . 60
29.1 Immunity – Accessories not incorporating electronic components . 60
29.2 Emission – Accessories not incorporating electronic components . 60
Annex A (normative) Proof tracking test . 61
Annex B (normative) Routine tests for factory wired appliance couplers related to
safety . 62
B.1 General . 62
B.2 Polarized systems: Phase Line (L) and neutral (N) – Correct connection . 62
B.3 Earth (PE) continuity . 63

B.4 Short-circuit/wrong connection and reduction in creepage distance
and clearance . 63
B.4.1 Accessible surface safety check . 63
B.4.2 Short-circuit/wrong connection . 63
Annex C (normative) Test schedule . 64
Annex D (informative) Comparison of typical conductor cross-sectional areas . 67
Annex E (normative) Additional tests and requirements for appliance couplers intended to
be used in ambient temperatures above +35 °C up to and including +90 °C . 68
E.1 General . 68
E.2 General requirements on tests . 68
E.2.1 General . 68
E.2.2 Test setup . 68
E.2.3 Conditions of temperature measurement . 68
E.2.4 Method of measurement . 69
E.3 Markings . 69
E.4 Determination of t and the rated and derated current in relation to the ambient
a
temperature . 69
E.4.1 Determination of the maximum ambient temperature (t ) for operation of
a
the accessory at the rated current . 69
E.4.2 Determination of the derated operating currents for ambient temperatures
above t . 70
a
E.5 Test to evaluate the long-term behaviour of the appliance couplers in ambient
temperatures above +35 °C up to and including +90 °C . 70
E.5.1 Resistance to heat . 70
E.5.2 Resistance to ageing . 71
E.5.3 Resistance to tracking . 72
E.6 Cords and their connections . 72
Bibliography . 74
List of comments . 75

Figure 1 – Intended use of appliance couplers . 11
Figure 2 – Device for testing non-solid pins . 23
Figure 3 – Apparatus for checking the withdrawal force . 31
Figure 4 – Gauge for verification of the minimum withdrawal force . 32
Figure 5 – Example of an apparatus for heating test (see 18.2) . 34
Figure 6 – Circuit diagram for breaking capacity and normal operation tests . 35
Figure 7 – Apparatus for testing the cord anchorage . 40
Figure 8 – Apparatus for the flexing test . 43
Figure 9 – Example of apparatus for pulling test . 47
Figure E.1 – Schematic drawing of a derating curve with an example of a derated current
I at the operating ambient temperature t . 70
d d
Table 1 – Position of contacts . 21
Table 2 – Maximum diameters of the cords . 28
Table 3 – Minimum insulation resistance . 29
Table 4 – Dielectric strength . 29
Table 5 – Maximum and minimum withdrawal forces . 30

– 6 – IEC 60320-1:2021 CMV © IEC 2021
Table 6 – Ratings for the tests of Clause 19 . 36
Table 7 – Ratings for the tests of Clause 20 . 37
Table 8 – Cords and conductors for the tests of Clause 21 . 38
Table 9 – Type and nominal cross-sectional area of cords . 39
Table 10 – Types of cord for the rewirable connector/plug connector test . 41
Table 11 – Applicable tests. 45
Table 12 – Values for the lateral pulls applied . 48
Table 12 – Values for torque and pull forces .
Table 13 – Values for pull forces . 50
Table 14 – Torque applied for the tightening and loosening test . 53
Table 15 – Rated impulse withstand voltage for appliance couplers energized directly from
the low voltage mains . 55
Table 16 – Minimum clearances for basic insulation . 56
Table 17 – Minimum creepage distances for basic and functional insulation . 57
Table B.1 – Test overview . 62
Table C.1 – Test schedule . 64
Table D.1 – Comparison of conductor sizes . 67

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
APPLIANCE COUPLERS FOR HOUSEHOLD
AND SIMILAR GENERAL PURPOSES –

Part 1: General requirements
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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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.
This commented version (CMV) of the official standard IEC 60320-1:2021 edition 4.0
allows the user to identify the changes made to the previous IEC 60320-1:2015+
AMD1:2018 edition 3.1. Futhermore, comments from IEC SC 23G experts are provided to
explain the reasons of the most relevant changes.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by
a blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.

– 8 – IEC 60320-1:2021 CMV © IEC 2021
IEC 60320-1 has been prepared by subcommittee 23G: Appliance couplers, of IEC technical
committee 23: Electrical accessories. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2015 and
Amendment 1:2018. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) introduction of necessary tolerances throughout this document;
b) the heating test from edition 2 is reintroduced in 18.2;
c) temperature rise added for plug connectors in Clause 21;
d) change for better readability in 23.3;
e) updated lateral pull test in 23.6 for connectors/plug connectors with separate front parts;
f) revision of 24.1 for ball pressure test;
g) Clause 27 for glow wire test is updated;
h) revision of Annex C for test sequences;
i) additional Annex E for additional tests and requirements for appliance couplers intended
to be used in ambient temperatures above +35 °C.
The text of this International Standard is based on the following documents:
FDIS Report on voting
23G/464/FDIS 23G/467/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.
A list of all the parts in the IEC 60320 series, under the general title Appliance couplers for
household and similar general purposes, can be found on the IEC website.
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.
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

APPLIANCE COUPLERS FOR HOUSEHOLD
AND SIMILAR GENERAL PURPOSES –

Part 1: General requirements
1 Scope
This part of lEC 60320 sets the general requirements for appliance couplers for two poles and
two poles with earth contact and for the connection of electrical devices for household and
similar onto the mains supply.
This document is also valid for appliance inlets/appliance outlets integrated or incorporated in
appliances.
The rated voltage does not exceed 250 V (AC) and the rated current does not exceed 16 A.
Appliance couplers complying with this document are suitable for normal use at ambient
temperatures not normally exceeding +40 °C, but their average over a period of 24 h does not
exceed +35 °C, with a lower limit of the ambient air temperature of −5 °C.
Annex E provides test requirements for derating the operating current of an accessory when
used in ambient temperatures above +35 °C up to and including +90 °C. 1
Appliance couplers are not suitable for:
– use in place of plug and socket-outlet systems according to IEC 60884-1;
– use in place of devices for connecting luminaires (DCLs) according to IEC 61995 or
luminaire supporting couplers (LSCs);
– use in place of installation couplers according to IEC 61535.
NOTE Requirements for d.c. are under consideration.
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.
IEC 60068-2-31, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling shocks,
primarily for equipment-type specimens
IEC 60068-2-60, Environmental testing – Part 2-60: Tests – Test Ke: Flowing mixed gas
corrosion test
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60112:2020, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
– 10 – IEC 60320-1:2021 CMV © IEC 2021
IEC 60245 (all parts), Rubber insulated cables – Rated voltages up to and including
450/750 V
IEC 60320 (all parts), Appliance couplers for household and similar general purposes
IEC 60320-3:2014, Appliance couplers for household and similar general purposes – Part 3:
Standard sheets and gauges
IEC 60320-3:2014/AMD1:2018
IEC 60417, Graphical symbols for use on equipment (available from: http://www.graphical-
symbols.info/equipment)
IEC 60664-1:20072020, Insulation coordination for equipment within low-voltage systems –
Part 1: Principles, requirements and tests
IEC 60695‐2‐10:2000, Fire hazard testing – Part 2‐10: Glowing/hot‐wire based test methods –
Glow‐wire apparatus and common test procedure
IEC 60695‐2‐11:20002014, Fire hazard testing – Part 2‐11: Glowing/hot‐wire based test
methods –Glow‐wire flammability test method for end‐products (GWEPT)
IEC 60695‐2‐12:2000, Fire hazard testing – Part 2‐12: Glowing/hot‐wire based test methods –
Glow‐wire flammability index (GWFI) test method for materials
IEC 60695‐2‐13:2000, Fire hazard testing – Part 2‐13: Glowing/hot‐wire based test methods –
Glow‐wire ignition temperature (GWIT) test method for materials
IEC 60695‐10‐2:2014, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
method
IEC 60730-2-11:2019, Automatic electrical controls for household and similar use – Part 2-11:
Particular requirements for energy regulators
IEC 60999-1:1999, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 1: General requirements and
2 2
particular requirements for clamping units for conductors from 0,2 mm up to 35 mm
(included)
IEC 61032:1997, Protection of persons and equipment by enclosures – Probes for verification
IEC 61058 (all parts), Switches for appliances
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
appliance coupler
means enabling the connection and disconnection of an appliance or equipment to the supply

1 Plug 5 Plug connector (see 3.2.1)
2 Connector (see 3.1.1) 6 Cord set (see 3.5)
3 Appliance inlet (see 3.1.2) 7 Interconnection cord set (see 3.6)
4 Appliance outlet (see 3.2.2)

Figure 1 – Intended use of appliance couplers
3.1.1
connector (of an appliance coupler)
part of the appliance coupler integral with, or intended to be attached to, one cord connected
to the supply
SEE: Figure 1.
[SOURCE: IEC 60050-442:1998, 442-07-02, modified – "the cord" has been replaced with
"one cord" and a reference to Figure 1 has been added.]
3.1.2
appliance inlet
part of the appliance coupler integrated as a part of an appliance or incorporated as a
separate part in the appliance or equipment or intended to be fixed to it
SEE: Figure 1.
3.2
interconnection coupler
appliance coupler enabling the connection and disconnection of an appliance or equipment to
a cord leading to another appliance or equipment
SEE: Figure 1.
Note 1 to entry: An interconnection coupler is a type of appliance coupler.
3.2.1
plug connector
part of the interconnection coupler integral with or intended to be attached to one cord
SEE: Figure 1.
[SOURCE: IEC 60050-442:1998, 442-07-09, modified – "the flexible cable" has been replaced
with "one cord" and a reference to Figure 1 has been added.]

– 12 – IEC 60320-1:2021 CMV © IEC 2021
3.2.2
appliance outlet
part of the interconnection coupler integrated in or incorporated in the appliance or equipment
or intended to be fixed to it, and from which the supply is obtained
SEE: Figure 1.
[SOURCE: IEC 60050-442:1998, 442-07-08, modified – A reference to Figure 1 has been
added.]
3.3
rewirable accessory appliance coupler
accessory so constructed that a cable or cord can be replaced
3.4
non-rewirable accessory appliance coupler
accessory so constructed that it forms a complete unit with flexible supply cable or cord after
connection and assembly by the manufacturer of the accessory
3.5
cord set
assembly consisting of one cable or cord fitted with one non-rewirable plug and one
non-rewirable connector, intended for the connection of an electrical appliance or equipment
to the electrical supply
SEE: Figure 1.
3.6
interconnection cord set
assembly consisting of one cable or cord fitted with one non-rewirable plug connector and one
non-rewirable connector, intended for the interconnection between two electrical appliances
SEE: Figure 1
Note 1 to entry: The definition is based on that of IEC 60050-442:1998, 442-07-06.
[SOURCE: IEC 60050-442:1998, 442-07-06, modified – “a” has been changed to “one” in two
places and a reference to Figure 1 has been added.]
3.7
integrated appliance coupler
appliance coupler which is formed by the housing or enclosure of the appliance or equipment
and that cannot be tested separately
3.8
incorporated appliance coupler
appliance coupler built in or fixed to an appliance or equipment, but that can be tested
separately
3.8  2
standardized appliance coupler
appliance coupler with dimensions in accordance with the standard sheets of IEC 60320-3
3.9  2
non-standardized appliance coupler
appliance coupler with dimensions not in accordance with the standard sheets of IEC 60320-3

3.10
base of a pin
part of the pin where it protrudes from the engagement face
3.11
retaining device
mechanical provision or arrangement which holds a connector in proper engagement with a
corresponding appliance inlet and prevents its unintentional withdrawal
3.12
rated voltage (for accessories)
voltage assigned by the manufacturer for a specified operating condition of an accessory
[SOURCE: IEC 60050-442:1998, 442-01-03]
3.13
rated current (for accessories)
current assigned by the manufacturer for a specified operating condition of an accessory
[SOURCE: IEC 60050-442:1998, 442‐01‐02]
3.14
terminal (for accessories)
part of an accessory to which a conductor is attached, providing a re-usable connection
[SOURCE: IEC 60050-442:1998, 442‐06‐05]
3.15
termination
part of an accessory to which a conductor is permanently attached
[SOURCE: IEC 60050-442:1998, 442‐06-06]
3.16
thread‐cutting screw
screw having an interrupted thread which, by screwing in, makes a thread by removing
material from the cavity
[SOURCE: IEC 60050-442:1998, 442-06-03]
3.17
type test
test of one or more devices made to a certain design to show that the design meets certain
requirements
[SOURCE: IEC 60050-811:1991, 811-10-04]
3.18
routine test
test to which each individual device is subjected during and/or after manufacture to ascertain
whether it complies with certain criteria
conformity test made on each individual item during or after manufacture
[SOURCE: IEC 60050-811:1991, 811-10-05 IEC 60050-151:2001, 151-16-17]

– 14 – IEC 60320-1:2021 CMV © IEC 2021
4 General requirements
Appliance couplers shall be so designed and constructed that in normal use their performance
is reliable and without danger to the user or to the surroundings.
A non-standardized appliance coupler shall comply with all safety requirements of this
document and shall be tested together with its counterpart.
Compliance is checked by carrying out all the tests specified.
Appliance couplers according to this standard are not intended to be used in portable
accessories covered by IEC TC 23.
5 General notes on tests
5.1 General
Tests shall be made to prove compliance with the requirements set out in this document,
where applicable.
Tests are as follows:
1) type tests shall be made on representative samples of each accessory.
2) routine tests shall be conducted by the manufacturer and made on each accessory.
3) unless otherwise specified, the tests are carried out in the order of the clauses in this
document.
4) unless otherwise specified, appliance couplers are tested together with their counterparts
that are in compliance with this document.
5) Appliance inlets and appliance outlets integrated or incorporated in an appliance or
equipment integ
...