Appliance couplers for household and similar general purposes - Part 2-4: Couplers dependent on appliance weight for engagement

IEC 60320-2-4:2018 is now available as IEC 60320-2-4:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60320-2-4:2018 is applicable to two-pole appliance couplers for alternating current only, with or without earthing contact, with a rated voltage not exceeding 250 V and a rated current not exceeding 16 A, for household and similar general purposes and intended for incorporation or integration within electric appliances or other electric equipment of multi‑part construction for 50 Hz or 60 Hz supply which depend on the weight of the appliance to ensure correct engagement. This second edition cancels and replaces the first edition published in 2005 and Amendment 1:2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- IEC 60320-2-4 is aligned with IEC 60320-1:2015.
- IEC 60320-2-4 is aligned with IEC 60335-1 and IEC 60335-2-15. IEC 60320-2-4 appliance couplers are incorporated into appliances designed and manufactured to these standards. To this end, particular attention is drawn to 14.2 and Clause 20.
- It also now proposes that appliance couplers with auxiliary contacts be considered.

Connecteurs pour usages domestiques et usages généraux analogues - Partie 2-4: Connecteurs à connexion par gravité

IEC 60320-2-4:2018 est disponible sous forme de IEC 60320-2-4:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 60320-2-4:2018 est applicable aux connecteurs bipolaires pour courant alternatif seulement, avec ou sans contact de mise à la terre, de tension assignée ne dépassant pas 250 V et de courant assigné ne dépassant pas 16 A, pour usages domestiques et généraux analogues, destinés à l'incorporation ou à l'intégration dans des appareils électriques d’utilisation ou dans d’autres matériels électriques réalisés par assemblage et alimentés à 50 Hz ou 60 Hz et qui dépendent du poids de l'appareil d’utilisation pour assurer un engagement correct. Cette deuxième édition annule et remplace la première édition parue en 2005 et l’Amendement 1:2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- L’IEC 60320-2-4 s’aligne avec l’IEC 60320-1:2015.
- L’IEC 60320-2-4 s’aligne avec l’IEC 60335-1 et avec l’IEC 60335-2-15. Les connecteurs de l’IEC 60320-2-4 sont incorporés dans les appareils d’utilisation conçus et fabriqués pour ces normes. À cet effet, une attention particulière est apportée au 14.2 et à l’Article 20.
- Il est également désormais proposé que les connecteurs avec contacts auxiliaires soient pris en considération.

General Information

Status
Published
Publication Date
28-Jun-2018
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
29-Jun-2018
Ref Project

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IEC 60320-2-4
Edition 2.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Appliance couplers for household and similar general purposes –
Part 2-4: Couplers dependent on appliance weight for engagement
Connecteurs pour usages domestiques et usages généraux analogues –
Partie 2-4: Connecteurs à connexion par gravité
IEC 60320-2-4:2018-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60320-2-4
Edition 2.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Appliance couplers for household and similar general purposes –
Part 2-4: Couplers dependent on appliance weight for engagement
Connecteurs pour usages domestiques et usages généraux analogues –
Partie 2-4: Connecteurs à connexion par gravité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.30 ISBN 978-2-8322-5824-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60320-2-4:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 General requirements ...................................................................................................... 8

5 General notes on tests .................................................................................................... 8

6 Standard ratings .............................................................................................................. 8

7 Classification ................................................................................................................... 9

8 Marking ......................................................................................................................... 10

9 Dimensions and compatibility ........................................................................................ 11

10 Protection against electric shock ................................................................................... 12

11 Provision for earthing .................................................................................................... 13

12 Terminals and terminations ............................................................................................ 13

13 Construction .................................................................................................................. 13

14 Moisture resistance ....................................................................................................... 14

15 Insulation resistance and electric strength ..................................................................... 15

16 Forces necessary to insert and withdraw the connector/appliance outlet ........................ 16

17 Operation of contacts .................................................................................................... 17

18 Resistance to heating of appliance couplers for hot conditions or very hot

conditions ...................................................................................................................... 17

19 Breaking capacity .......................................................................................................... 18

20 Normal operation ........................................................................................................... 19

21 Temperature rise ........................................................................................................... 20

22 Cords and their connection ............................................................................................ 21

23 Mechanical strength ...................................................................................................... 21

24 Resistance to heat and ageing....................................................................................... 22

25 Screws, current-carrying parts and connections ............................................................. 22

26 Clearances, creepage distances and solid insulation ..................................................... 23

27 Resistance of insulating material to heat, fire and tracking ............................................ 29

28 Resistance to rusting ..................................................................................................... 30

29 Electromagnetic compatibility (EMC) requirements ........................................................ 30

Annex AA (normative) Needle-flame test .............................................................................. 31

Annex BB (normative) Apparatus for the test of 14.102 ........................................................ 32

Annex C (normative) Test schedule ..................................................................................... 33

Figure 101 – Examples of clearances ................................................................................... 26

Figure BB.1 – Apparatus for the test of Subclause 14.102 .................................................... 32

Table 101 – Test voltages ..................................................................................................... 16

Table 102 – Ratings for the tests of Clause 20 ...................................................................... 20

---------------------- Page: 4 ----------------------
IEC 60320-2-4:2018 © IEC 2018 – 3 –

Table 103 – Rated impulse voltage ....................................................................................... 24

Table 104 – Minimum clearances .......................................................................................... 24

Table 105 – Minimum creepage distances for basic insulation .............................................. 28

---------------------- Page: 5 ----------------------
– 4 – IEC 60320-2-4:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
APPLIANCE COUPLERS FOR HOUSEHOLD
AND SIMILAR GENERAL PURPOSES –
Part 2-4: Couplers dependent on appliance
weight for engagement
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.

International Standard IEC 60320-2-4 has been prepared by subcommittee 23G: Appliance

couplers, of IEC technical committee 23: Electrical accessories.
This second edition cancels and replaces the first edition published in 2005 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) IEC 60320-2-4 is aligned with IEC 60320-1:2015.

b) IEC 60320-2-4 is aligned with IEC 60335-1 and IEC 60335-2-15. IEC 60320-2-4 appliance

couplers are incorporated into appliances designed and manufactured to these standards.

To this end, particular attention is drawn to 14.2 and Clause 20.

c) It also now proposes that appliance couplers with auxiliary contacts be considered.

---------------------- Page: 6 ----------------------
IEC 60320-2-4:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
23G/402/FDIS 23G/404/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This Part 2-4 is to be used in conjunction with IEC 60320-1: Appliance couplers for household

and similar general purposes – Part 1: General requirements. It was established on the basis

of the third edition of that standard (2015).

The clauses of this standard supplement or modify the corresponding clauses of IEC 60320-1.

When a particular subclause or annex of Part 1 is not mentioned in this Part 2-4, the

subclause or annex of IEC 60320-1 applies without modification as far as is reasonable.

Where this standard states “addition”, “modification” or “replacement”, the relevant

requirement, test specification or explanatory matter in IEC 60320-1 should be adapted

accordingly.

Subclauses, figures or tables which are additional to those in Part 1 are numbered starting

from 101. Additional annexes are lettered AA, BB, etc.
In this particular standard the following print types are used:
• requirements: in roman type;
• test specifications: in italic type;
• explanatory matter: in smaller roman type.

A list of all parts in the IEC 60320 series, published under the general title Appliance couplers

for household and similar general purposes, 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 60320-2-4:2018 © IEC 2018
APPLIANCE COUPLERS FOR HOUSEHOLD
AND SIMILAR GENERAL PURPOSES –
Part 2-4: Couplers dependent on appliance
weight for engagement
1 Scope
This clause of IEC 60320-1 is replaced as follows:

This part of IEC 60320 is applicable to two-pole appliance couplers for alternating current

only, with or without earthing contact, with a rated voltage not exceeding 250 V and a rated

current not exceeding 16 A, for household and similar general purposes and intended for

incorporation or integration within electric appliances or other electric equipment of multi-part

construction for 50 Hz or 60 Hz supply which depend on the weight of the appliance to ensure

correct engagement.

This document is also applicable to appliance couplers with auxiliary contacts rated for

alternating current, direct current or both, with a total rated current not exceeding 16 A.

This document is also valid for appliance inlets/appliance outlets integrated or incorporated in

appliances.

NOTE 1 Appliance couplers complying with this document are suitable for use in appliances which are used in an

ambient temperature not normally exceeding 25 °C but occasionally reaching 35 °C. However the ambient

temperature surrounding the appliance coupler can exceed these figures and can be declared by the manufacturer.

It is possible that the maximum working ambient temperature for the appliance inlet and for the connector can be

different.

NOTE 2 Appliance couplers dependent on appliance weight for engagement can be subject to spillage of liquid in

normal use. They are classified according to whether protection against liquid spillage is provided, when installed

in accordance with the manufacturer’s installation instructions.

NOTE 3 If appliance inlets according to this document are used with appliances or other equipment which can be

subject to spillage of liquid affecting the appliance inlet when the functioning part of the appliance or equipment is

seated on its power base, then protection against moisture is provided by the equipment.

NOTE 4 References to standard sheets within IEC 60320-1 do not apply to appliance couplers dependent on

appliance weight for engagement.
NOTE 5 Special constructions can be required:

• in locations where special conditions can prevail, for example, in ships, vehicles and the like;

• in hazardous locations, for example, where explosions are likely to occur.

NOTE 6 Additional auxiliary contacts can be used as part of the appliance coupler. An example of an auxiliary

contact is a contact used to supply a low power device or used to transmit signals for sensors and to/from a

microprocessor.
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.
This clause of IEC 60320-1 applies with the following additions:
---------------------- Page: 8 ----------------------
IEC 60320-2-4:2018 © IEC 2018 – 7 –

IEC TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in

member countries of IEC

IEC 60320-1:2015, Appliance couplers for household and similar general purposes – Part 1:

General requirements

IEC 60335-1:2010, Household and similar electrical appliances – Safety – Part 1: General

requirements
IEC 60335-1:2010/AMD1:2013
IEC 60335-1:2010/AMD2:2016
IEC 60529, Degrees of protection provided by enclosures (IP Code)

IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems − Part 1:

Principles, requirements and tests

IEC 60695-11-5:2016, Fire hazard testing – Part 11-5: Test flames – Needle-flame test

method – Apparatus, confirmatory test arrangement and guidance

IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical

flame test methods
IEC 60730-(all parts), Automatic electrical controls

ISO 9772, Cellular plastics – Determination of horizontal burning characteristics of small

specimens subjected to a small flame
3 Terms and definitions
This clause of IEC 60320-1 applies with the following additions:
3.101
weight-engaged coupler

coupler that relies on the weight of the functioning part of the appliance, in which it is

incorporated or integrated, to ensure correct engagement

Note 1 to entry: The weight-engaged coupler is used in an appliance which is in two parts, in order to supply the

part that performs the function of the appliance (the functioning part) from the power base which is connected to

the power supply.
3.102
weight-engaged connector

component part of the weight-engaged coupler which carries the power connections, and

engages with the corresponding appliance inlet
3.103
weight-engaged appliance inlet

component part of a weight-engaged coupler intended for integration or incorporation in the

functioning part of the appliance
3.104
rewirable weight-engaged connector
weight-engaged connector so constructed that the supply cord can be replaced

Note 1 to entry: The method of attachment of the supply cord, when installed in accordance with the

manufacturer’s installation instructions, is classified according to type X or type Y attachment requirements of the

appliance standards.
---------------------- Page: 9 ----------------------
– 8 – IEC 60320-2-4:2018 © IEC 2018

Note 2 to entry: The requirements for type X or type Y attachment methods are given in IEC 60335-1.

3.105
type X attachment
method of attachment of the supply cord such that it can easily be replaced

Note 1 to entry: The supply cord may be specially prepared and only available from the manufacturer or its

service agent. A specially prepared cord may include a part of the appliance.
3.106
type Y attachment

method of attachment of the supply cord such that any replacement is intended to be made by

the manufacturer, its service agent or similar qualified person
3.107
type Z attachment

method of attachment of the supply cord such that it cannot be replaced without breaking or

destroying the appliance
3.108
auxiliary contact

contact included in the appliance coupler to operate an auxiliary circuit as part of the normal

operation of the appliance, with a maximum allowable current rating of 2 A

Note 1 to entry: An example of an auxiliary contact is a pole used to supply a low current device, used to transmit

signals for sensors and to/from a microprocessor.
3.109
non-polarized

designed so that the inlet and connector auxiliary contact poles are interchangeable

4 General requirements
This clause of IEC 60320-1 applies.
5 General notes on tests
This clause of IEC 60320-1 applies amended as follows:
5.2 Replacement:

The specimens are tested as delivered and under normal conditions of use, in accordance

with the installation instructions of the manufacturer. For alternating current they are tested at

50 Hz or 60 Hz.

Non-rewirable weight-engaged connectors shall be submitted with a cord at least 1 m long.

For those clauses requiring the tests to be carried out on weight-engaged connectors and

weight-engaged appliance inlets installed in accordance with the manufacturer’s instructions,

representative appliances or appliance parts shall be supplied.
6 Standard ratings
This clause of IEC 60320-1 is replaced as follows:
---------------------- Page: 10 ----------------------
IEC 60320-2-4:2018 © IEC 2018 – 9 –

6.1 The standard rated voltage is 250 V. Other rated voltages may be declared by the

manufacturer provided they do not exceed 250 V.

6.2 The rated current shall be declared by the manufacturer. A coupler may have different

current ratings dependent on use within specified applications. The rated current shall not in

any case exceed 16 A.

Compliance with the requirements of 6.1 and 6.2 is checked by visual inspection of the

marking or the manufacturer’s instructions for installation and use.
7 Classification
This clause of IEC 60320-1 is replaced as follows:
7.1 According to maximum temperature of the corresponding appliance inlet:

a) appliance couplers for cold conditions, appliance inlet temperature not exceeding 70 °C;

b) appliance couplers for hot conditions, appliance inlet temperature not exceeding 120 °C;

c) appliance couplers for very hot conditions, appliance inlet temperature not exceeding

155 °C.

NOTE Appliance couplers for hot conditions can also be used under cold conditions; appliance couplers for very

hot conditions can also be used under cold or hot conditions.
7.2 According to the type of equipment to be connected:
a) appliance couplers for class I equipment;
b) appliance couplers for class II equipment.
NOTE For a description of the classes, see lEC 61140.

7.3 According to protection against liquid spillage when the connector is installed according

to the manufacturer’s instructions:
a) protected;
b) not protected.
7.4 According to breaking capacity:
a) the coupler is intended to be engaged and disengaged with current flowing;
b) the coupler is intended to be engaged and disengaged without current flowing.
7.5 According to the maximum ambient working temperature of the coupler

NOTE The maximum ambient working temperature of the connector and appliance inlet can be different.

7.6 According to the number of cycles to be performed in the test of Clause 20. Preferred

values are:
• 100 000
• 60 000
• 30 000
• 20 000
• 10 000
• 6 000

NOTE Different numbers of endurance cycles can be declared for different current ratings of the same coupler. A

cycle is two strokes as defined in Clause 19, that is, one connection followed by one disconnection.

---------------------- Page: 11 ----------------------
– 10 – IEC 60320-2-4:2018 © IEC 2018
7.7 The following information is recorded to cover required tests:
a) The specified minimum cross-sectional area of cord.
b) The maximum allowable terminal temperature rise.
c) The maximum allowable termination temperature rise.
d) The maximum allowable contact temperature rise.
e) The minimum appliance weight required for correct engagement.
f) The minimum base weight required for correct disengagement.
g) The end equipment standard.
h) The type of load to be connected:
– resistive load
– inductive load
– capacitive load
– specific load
– direct current (auxiliary contacts)
i) Type of cord to be connected (e.g. IEC type 52).
j) Function of the connector:
– connectors which normally make the connected load
– connectors which do not normally make the connected load
– connectors which normally break the connected load
– connectors which do not normally break the connected load

NOTE Connectors which carry a current of 200 mA or less are considered to be off-load.

k) For connectors with auxiliary contacts,
– number of auxiliary contacts
– maximum current rating of auxiliary contacts
– maximum voltage rating of auxiliary contacts
– specified for use in DC applications the contacts shall be classified as
i) polarized or
ii) non-polarized

– the insulation classification between the auxiliary circuit and primary circuit

NOTE For SELV and PELV refer to the appropriate intended product standard.
8 Marking
This clause of IEC 60320-1 applies amended as follows:
8.2 Replacement:
Weight-engaged appliance inlets shall be marked with the name, trademark or
...

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