IEC 60974-2:2013

IEC 60974-2 ®
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 2: Liquid cooling systems

Matériel de soudage à l’arc –
Partie 2: Systèmes de refroidissement par liquide

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IEC 60974-2 ®
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 2: Liquid cooling systems

Matériel de soudage à l’arc –
Partie 2: Systèmes de refroidissement par liquide

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 25.160 ISBN 978-2-83220-572-3

– 2 – 60974-2 © IEC:2013
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 Conformity of components . 7
5.4 Type tests . 7
5.5 Routine tests . 7
6 Protection against electric shock . 8
6.1 Insulation . 8
6.1.1 General . 8
6.1.2 Clearances . 8
6.1.3 Creepage distances . 8
6.1.4 Insulation resistance . 8
6.1.5 Dielectric strength . 8
6.2 Protection against electric shock in normal service (direct contact) . 8
6.3 Protection against electric shock in case of a fault condition (indirect contact) . 8
6.3.1 Protective provisions . 8
6.3.2 Isolation between windings of the supply circuit and the welding
circuit . 8
6.3.3 Internal conductors and connections . 8
6.3.4 Touch current in fault condition . 8
6.4 Connection to the supply network . 8
6.4.1 Supply voltage . 8
6.4.2 Multi-supply voltage . 8
6.4.3 Means of connection to the supply circuit . 9
6.4.4 Marking of terminals . 9
6.4.5 Protective circuit . 9
6.4.6 Cable anchorage . 9

6.4.7 Inlet openings . 9
6.4.8 Supply circuit on/off switching device . 9
6.4.9 Supply cables . 9
6.4.10 Supply coupling device (attachment plug) . 9
6.5 Leakage current between welding circuit and protective earth . 9
7 Mechanical provisions . 10
7.1 General . 10
7.2 Cooling liquid overflow . 10
7.3 Hose coupling devices and hose connections . 10
8 Cooling system . 10
8.1 Rated maximum pressure . 10
8.2 Thermal requirements . 11
8.2.1 Heating test . 11
8.2.2 Tolerances of test parameters . 11

60974-2 © IEC:2013 – 3 –
8.2.3 Duration of test . 11

8.3 Pressure and temperature . 11

9 Abnormal operation . 11

9.1 General requirements . 11

9.2 Stalled test . 11

10 Cooling power . 12

11 Rating plate . 13

11.1 General . 13

11.2 Description . 13

11.3 Contents. 14
11.4 Tolerances . 15
12 Instructions and markings . 15
12.1 Instructions . 15
12.2 Markings . 15
12.2.1 General . 15
12.2.2 Inlet and outlet . 15
12.2.3 Pressure warning . 16
Annex A (informative) Example diagram of built-in and stand-alone liquid cooling
systems . 17
Annex B (informative) Example for a rating plate of stand-alone cooling system . 18

Figure 1 – Leakage current measurement configuration . 10
Figure 2 – Measuring circuit for determination of the cooling power . 13
Figure 3 – Principle of the rating plate of stand-alone cooling systems . 14
Figure A.1 – Example diagram of built-in liquid cooling systems. 17
Figure A.2 – Example diagram of stand-alone liquid cooling systems . 17

Table 1 – Example of cooling liquid data at 60 °C . 13

– 4 – 60974-2 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
ARC WELDING EQUIPMENT –
Part 2: Liquid cooling systems

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 en
...