Arc welding equipment - Part 12: Coupling devices for welding cables

IEC 60974-12:2022 is available as IEC 60974-12:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60974-12:2022 is applicable to coupling devices for cables used in arc welding and allied processes, designed for connection and disconnection without using tools. This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- updated Table 1 to include 100 % duty cycle;
- updated Annex A to provide more detail.

Matériel de soudage à l'arc - Partie 12: Dispositifs de connexion pour câbles de soudage

IEC 60974-12:2022 est disponible sous forme de IEC 60974-12:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60974-12:2022 s'applique aux dispositifs de connexion pour câbles utilisés lors du soudage et des techniques connexes conçus pour assurer les opérations de connexion et de déconnexion sans emploi d'outils. Cette quatrième édition annule et remplace la troisième édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- mise à jour du Tableau 1 pour inclure le facteur de marche de 100 %;
- mise à jour de l'Annexe A pour fournir plus de détails.

General Information

Status
Published
Publication Date
07-Jul-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
08-Jul-2022
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IEC 60974-12
Edition 4.0 2022-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 12: Coupling devices for welding cables
Matériel de soudage à l'arc –
Partie 12: Dispositifs de connexion pour câbles de soudage
IEC 60974-12:2022-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60974-12
Edition 4.0 2022-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 12: Coupling devices for welding cables
Matériel de soudage à l'arc –
Partie 12: Dispositifs de connexion pour câbles de soudage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.160.30 ISBN 978-2-8322-3971-1

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 60974-12:2022 © IEC 2022
CONTENTS

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

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

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

3 Terms and definitions ...................................................................................................... 6

4 Environmental conditions ................................................................................................. 7

5 Tests ............................................................................................................................... 7

5.1 Test conditions ....................................................................................................... 7

5.2 Measuring instruments ............................................................................................ 7

5.3 Test sequence ........................................................................................................ 7

6 Designation ..................................................................................................................... 7

7 Protection against electric shock ..................................................................................... 8

7.1 Voltage rating ......................................................................................................... 8

7.2 lnsulation resistance ............................................................................................... 8

7.3 Dielectric strength ................................................................................................... 9

7.3.1 General requirement ........................................................................................ 9

7.3.2 Additional requirements for ARC STRIKING VOLTAGE or ARC STABILIZING

VOLTAGE rating ................................................................................................. 9

7.4 Protection of live parts against unintentional contact ............................................... 9

8 Thermal rating ............................................................................................................... 10

8.1 Temperature rise .................................................................................................. 10

8.2 Resistance to hot objects ...................................................................................... 10

9 Mechanical requirements ............................................................................................... 11

9.1 RETAINING MEANS ................................................................................................... 11

9.2 Welding cable entry .............................................................................................. 11

9.3 Penetration of the welding cable insulation ........................................................... 11

9.4 Welding cable connection ..................................................................................... 11

9.5 Crush strength ...................................................................................................... 11

9.6 Dimensions ........................................................................................................... 12

10 Marking ......................................................................................................................... 12

11 Instructions for use ........................................................................................................ 13

Annex A (normative) Dimensions ......................................................................................... 14

Bibliography .......................................................................................................................... 17

Figure 1 – Device for testing the resistance to hot objects .................................................... 10

Figure A.1 – Male element .................................................................................................... 14

Figure A.2 – Female element ................................................................................................ 14

Figure A.3 – Type 1 locking pin maximum outline shape ....................................................... 15

Figure A.4 – Type 2 locking pin maximum outline shape ....................................................... 16

Figure A.5 – Type 3 locking pin maximum outline shape ....................................................... 16

Table 1 – Relation between COUPLING DEVICE test current and welding cables' cross-

sectional area ......................................................................................................................... 8

Table 2 – Voltage rating of COUPLING DEVICES ......................................................................... 8

Table 3 – Crush force ........................................................................................................... 12

---------------------- Page: 4 ----------------------
IEC 60974-12:2022 © IEC 2022 – 3 –
Table A.1 – Dimensions for Figure A.1, Figure A.2, Figure A.3, Figure A.4, and

Figure A.5 ............................................................................................................................. 15

---------------------- Page: 5 ----------------------
– 4 – IEC 60974-12:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 12: Coupling devices for welding cables
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

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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.

IEC 60974-12 has been prepared by IEC technical committee 26: Electric welding. It is an

International Standard.

This fourth edition cancels and replaces the third edition published in 2011. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) updated Table 1 to include 100 % duty cycle;
b) updated Annex A to provide more detail.
---------------------- Page: 6 ----------------------
IEC 60974-12:2022 © IEC 2022 – 5 –
The text of this document is based on the following documents:
Draft Report on voting
26/734/FDIS 26/736/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.
In this document, the following print types are used:
– conformity statements: in italic type.

– terms used throughout this document which have been defined in Clause 3: SMALL ROMAN

CAPITALS.

A list of all parts of the IEC 60974 series can be found, under the general title Arc welding

equipment, 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 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 60974-12:2022 © IEC 2022
ARC WELDING EQUIPMENT –
Part 12: Coupling devices for welding cables
1 Scope

This part of IEC 60974 is applicable to COUPLING DEVICES for cables used in arc welding and

allied processes, designed for connection and disconnection without using tools.

This part of IEC 60974 specifies safety and performance requirements of COUPLING DEVICES.

This part of IEC 60974 is not applicable to COUPLING DEVICES for underwater welding.

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 60050-151, International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and

magnetic devices
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60974-1:2021, Arc welding equipment – Part 1: Welding power sources
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-151 and

IEC 60974-1, as well as the following 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
COUPLING DEVICE

device connecting two welding cables together or connecting a welding cable to welding

equipment
3.2
RETAINING MEANS

mechanical arrangement that holds the COUPLING DEVICE in position and prevents an

unintentional withdrawal, when properly connected
3.3
ARC STRIKING VOLTAGE
voltage superimposed on the welding circuit to ignite the arc
---------------------- Page: 8 ----------------------
IEC 60974-12:2022 © IEC 2022 – 7 –
3.4
ARC STABILIZING VOLTAGE
voltage superimposed on the arc voltage to maintain the arc
4 Environmental conditions

The COUPLING DEVICE shall be capable of operation when the following environmental conditions

prevail:
a) range of ambient air temperature:
– during operation: −10 °C to + 40 °C;
b) relative humidity of the air: up to 90 % at 20 °C.
5 Tests
5.1 Test conditions

All type tests shall be carried out on the same new and completely assembled COUPLING DEVICE.

All type tests shall be carried out at an ambient air temperature between 10 °C and 40 °C.

5.2 Measuring instruments
As specified in 5.2 of IEC 60974-1:2021.
5.3 Test sequence
The type tests given below shall be carried out in the following sequence:
a) general visual inspection;
b) temperature rise, see 8.1;
c) crush strength, see 9.5;
d) insulation resistance, see 7.2;
e) dielectric strength, see 7.3.

The other type tests in this document not mentioned above can be carried out in any convenient

sequence.
6 Designation

COUPLING DEVICES shall be designated by the range of cross-sectional area of the welding cable

intended to be connected. The test current is given in Table 1 based on maximum cross-section

area. The welding COUPLING DEVICE shall accept the minimum cross-sectional area as given in

Table 1. It is possible that a reduced minimum cross-sectional area be specified to extend the

COUPLING DEVICE fitting range.

NOTE Current capacity of welding cables is given in Table D.4 of EN 50565-1:2014. The 60 % duty cycle current

rating relates to 25 °C of this table.
---------------------- Page: 9 ----------------------
– 8 – IEC 60974-12:2022 © IEC 2022
Table 1 – Relation between COUPLING DEVICE test current
and welding cables' cross-sectional area
Range of cross-sectional area COUPLING DEVICE test current
at 60 % duty cycle
1 to 6 80
6 to 10 125
10 to 16 150
16 to 25 200
25 to 35 250
35 to 50 300
50 to 70 400
70 to 95 500
95 to 120 600
NOTE Test current is defined in order that COUPLING DEVICE withstands the rated
current of the welding cable.
Conformity shall be checked by measurement.
7 Protection against electric shock
7.1 Voltage rating

COUPLING DEVICES shall be rated in accordance with the process as given in Table 2 and the

ARC STRIKING VOLTAGE or ARC STABILIZING VOLTAGE if applicable.
Table 2 – Voltage rating of COUPLING DEVICES
Process Voltage rating Insulation Dielectric strength Degree of
resistance protection in
accordance with
V peak MΩ V RMS
IEC 60529
All processes
except plasma 113 2,5 1 000 IP 3X
cutting
Plasma cutting 500 2,5 2 100 IP 3X
7.2 lnsulation resistance

The insulation resistance of a new COUPLING DEVICE shall, after the humidity treatment, be not

less than 2,5 MΩ.
Conformity shall be checked by the following test.
a) Humidity treatment

A humidity cabinet is maintained at a temperature t between 20 °C and 30 °C and a relative

humidity between 91 % and 95 %.

The COUPLING DEVICE without cables fitted is brought to a temperature between t and t + 4 K

and is then placed for 48 h in the humidity cabinet.
---------------------- Page: 10 ----------------------
IEC 60974-12:2022 © IEC 2022 – 9 –
b) Insulation resistance measurement

Immediately after the humidity treatment, the COUPLING DEVICE is wiped clean and tightly

wrapped in a metal foil covering the external surface of the insulation.

The insulation resistance is measured by application of a DC voltage of 500 V between the

live parts and the metal foil, the reading being made after stabilization of the measurement.

7.3 Dielectric strength
7.3.1 General requirement

The insulation shall withstand an AC test voltage of 2 100 V RMS for plasma cutting or 1 000 V

RMS for all other processes without flashover or break down. Any discharges unaccompanied

by a voltage drop are disregarded.
Conformity shall be checked by the following test.

The COUPLING DEVICE is wiped clean and tightly wrapped in a metal foil covering the external

surface of the insulation.

The AC test voltage shall be of an approximate sine waveform with a peak value not exceeding

1,45 times the RMS value, having a frequency of 50 Hz or 60 Hz, applied for 1 min between the

live parts and the metal foil.

7.3.2 Additional requirements for ARC STRIKING VOLTAGE or ARC STABILIZING VOLTAGE

rating

For couplers for use with ARC STRIKING VOLTAGE or ARC STABILIZING VOLTAGE, the insulation shall

withstand the rated peak ARC STRIKING VOLTAGE or ARC STABILIZING VOLTAGE as rated by the

manufacturer. The insulation shall withstand a high frequency voltage of pulse width 0,2 µs to

8 µs, a repetition frequency of 50 Hz to 300 Hz and shall be 20 % higher than the rated peak

ARC STRIKING VOLTAGE or ARC STABILIZING VOLTAGE as determined by the manufacturer.

Conformity shall be checked by the following test.

For couplers intended for use with ARC STRIKING VOLTAGE or ARC STABILIZING VOLTAGE, the

couplers shall be subjected to the high-frequency test voltage. The full value of the

high-frequency voltage is applied for 2 s between the electrode circuit, and
a) conductive surfaces;
b) other isolated circuits.

Flashover or breakdown shall not occur. Any discharges unaccompanied by a voltage drop

(corona) are disregarded.

Alternatively, for couplers intended for use with ARC STRIKING VOLTAGE or ARC STABILIZING

VOLTAGE, an AC test voltage of approximately sine waveform at 50 Hz or 60 Hz can be used.

7.4 Protection of live parts against unintentional contact

Parts designed to carry welding current and likely to be live after disconnection shall be

recessed to a depth of at least 10 % of the internal diameter of the insulation with a minimum

depth of 2 mm with respect to the insulating body.

As a consequence, insulation shall be able to withstand normal service conditions so that the

protecting length is maintained during the life of the COUPLING DEVICE.
Conformity shall be checked by linear measurement and visual inspection.
---------------------- Page: 11 ----------------------
– 10 – IEC 60974-12:2022 © IEC 2022
8 Thermal rating
8.1 Temperature rise

The temperature rise caused by the current passing through a COUPLING DEVICE normally

coupled and fitted with an untinned copper welding cable of maximum cross-sectional area as

indicated in Table 1 shall not exceed 45 K at the hottest spot of the external surface.

Conformity shall be checked by the following test.

The COUPLING DEVICE is normally coupled and fitted with at least 2 m long welding cables. The

COUPLING DEVICE is suspended by its welding cables from two wooden laths 1 m apart, hanging

between the two laths in the horizontal plane about 200 mm above the ground in a draught-free

area.

A continuous DC current equal to 75 % of the test current (equivalent to approximately 60 %

duty cycle) is passed through the COUPLING DEVICE until the rate of the temperature rise does

not exceed 2 K/h. During the total test time, the DC current shall be kept constant with a

tolerance of ± 2 %.
8.2 Resistance to hot objects

The insulation shall be capable of withstanding hot objects and the effects of a normal amount

of weld spatter without being ignited or becoming unsafe.
Conformity shall be checked with a device in accordance with Figure 1.
Dimensions in millimetres
Key
1 18/8 chrome-nickel steel rod
2 COUPLING DEVICE
θ test temperature
Figure 1 – Device for testing the resistance to hot objects

An electric current (of approximately 25 A) is passed through the 18/8 chrome-nickel steel rod

until a steady-state temperature θ of 300 °C is reached. During the test, the temperature of

the heated rod shall be maintained. This temperature will be measured by a contact

thermometer or thermocouple.

The heated rod in a horizontal position is then applied for 2 min to the insulation at the weakest

point (for example, minimum insulation thickness and closest distance to live parts). The heated

rod shall not penetrate through the insulation and contact live parts.
---------------------- Page: 12 ----------------------
IEC 60974-12:2022 © IEC 2022 – 11 –

An attempt is made to ignite any gases which can be emitted in the region of the contact point

by means of an electric spark or small flame. If the gases are flammable, the burning shall stop

as soon as the heated rod is removed.
9 Mechanical requirements
9.1 RETAINING MEANS

A RETAINING MEANS shall be provided to prevent the unintentional separation of the COUPLING

DEVICE as a result of a longitudinal pull.

NOTE If possible, indicating marks, for example two lines opposite each other, show by visual inspection that the

RETAINING MEANS has functioned.
Conformity shall be checked by manual operation and visual inspection.
9.2 Welding cable entry

The cable entry of a cable coupler shall be designed to prevent damage to the cable insulation

causing exposed conductors.

Conformity shall be checked by bending the cable through an angle of 90°. Verify that there are

no exposed conductors by visual inspection.
9.3 Penetration of the welding cable insulation

The design of cable couplers shall be such that the insulation of the cables can enter to a depth

of at least twice the outer diameter of the welding cable with a minimum of 30 mm.

Conformity shall be checked by measurement with a welding cable of the maximum cross-

sectional area as specified by the manufacturer.
9.4 Welding cable connection

The design of the COUPLING DEVICE shall be such that welding cables with a cross-sectional area

within the range as specified by the manufacturer can be replaced. The connection shall

withstand the mechanical stress of the tensile test without separation.
Conformity shall be checked by visual inspection and by the following test.

A plug, a connector or a plug connector is fitted in accordance with the manufacturer’s

instructions, with a welding cable of maximum cross-sectional area. The connection is subjected

to 10 pulls with a force of 40 N/mm of the cross-sectional area with a maximum of 2 000 N

applied to the welding cable. The force of each pull is gradually increased from zero to the

specified value in 1 s and maintained for 1 s.
After the test, the conductor shall not have been displaced by more than 2 mm.

This test shall be repeated with a welding cable having the minimum permissible cross-sectional

area as specified by the manufacturer.

If more than one method of cable fixing is provided, all methods shall be tested.

9.5 Crush strength

COUPLING DEVICES shall withstand the mechanical stress of the crush test without the insulation

being destroyed or the mechanical functioning being impaired.
---------------------- Page: 13 ----------------------
– 12 – IEC 60974-12:2022 © IEC 2022

Conformity shall be checked by the following test, manual operation and visual inspection.

A cable coupler connected and fitted, in accordance with the manufacturer’s instructions, with

welding cables of maximum cross-sectional area is placed between the parallel plates of a

press, the axis of the cable coupler being at a
...

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