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IEC 60974-8
Edition 3.0 2021-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Arc welding equipment –
Part 8: Gas consoles for welding and plasma cutting systems
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IEC 60974-8
Edition 3.0 2021-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Arc welding equipment –
Part 8: Gas consoles for welding and plasma cutting systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.160.30 ISBN 978-2-8322-9744-5
– 2 – IEC 60974-8:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Environmental conditions . 9
5 Tests . 9
5.1 Test conditions . 9
5.2 Measuring instruments . 9
5.3 Conformity of components . 9
5.4 Type tests . 9
5.5 Routine tests. 9
5.5.1 EXTERNAL GAS CONSOLE . 9
5.5.2 INTERNAL GAS CONSOLE . 9
6 Protection against electric shock . 10
6.1 Insulation . 10
6.1.1 General . 10
6.1.2 Clearances . 10
6.1.3 Creepage distances . 10
6.1.4 Insulation resistance . 10
6.1.5 Dielectric strength . 10
6.2 Protection against electric shock in normal service (direct contact) . 10
6.2.1 Protection provided by the enclosure . 10
6.2.2 Capacitors . 10
6.2.3 Automatic discharge of supply circuit capacitors . 10
6.2.4 Isolation of the welding circuit . 10
6.2.5 Welding circuit touch current . 11
6.2.6 Touch current in normal condition . 11
6.3 Protection against electric shock in case of a fault condition (indirect
contact) . 11
7 Thermal requirements . 11
7.1 Heating test . 11
7.2 Maximum temperature .
7.2 Temperature measurement . 11
7.3 Limits of temperature rise . 11
8 Connections for plasma cutting torches . 11
9 Mechanical requirements provisions . 12
9.1 General . 12
9.2 Protection against fire or explosion . 12
9.3 Gas line purging. 12
9.4 Enclosure . 13
9.4.1 Design requirements . 13
9.4.2 Enclosure purging . 13
9.4.3 Safe design of GAS CONSOLE . 13
9.4.4 Open structure . 14
9.4.5 Solid filled enclosure . 14
9.5 EXTERNAL GAS CONSOLE . 14
9.6 INTERNAL GAS CONSOLE . 14
10 Gas lines . 14
10.1 Gas hoses and tubing . 14
10.2 Gas fittings . 15
10.3 Leak test . 15
11 Control circuits . 15
12 Rating plate . 15
12.1 EXTERNAL GAS CONSOLE . 16
12.2 INTERNAL GAS CONSOLE . 16
13 Instructions and markings . 16
13.1 General . 16
13.2 Instructions . 16
13.3 Marking . 17
Annex A (informative) Mechanized plasma system diagram . 18
Annex B (informative) Example of a rating plate layout . 19
Bibliography . 20
Figure A.1 – Example of a mechanized plasma system . 18
Figure B.1 – Principle of a rating plate . 19
Table 1 – Colour coding and marking . 15
– 4 – IEC 60974-8:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 8: Gas consoles for welding and plasma cutting systems
FOREWORD
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