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IEC 60974-1
Edition 6.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Arc welding equipment –
Part 1: Welding power sources
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IEC 60974-1
Edition 6.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Arc welding equipment –
Part 1: Welding power sources
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.160.30 ISBN 978-2-8322-9962-3
– 2 – IEC 60974-1:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 7
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
3.1 General terms and definitions . 13
3.2 Terms and definitions related to BATTERY SYSTEMs . 22
3.3 Terms and definitions related to efficiency and IDLE STATE power
measurement . 24
4 Environmental conditions . 26
5 Tests . 26
5.1 Test conditions . 26
5.2 Measuring instruments . 26
5.3 Conformity of components . 27
5.4 TYPE TESTs . 27
5.5 ROUTINE TESTs . 29
6 Protection against electric shock . 29
6.1 Insulation . 29
6.2 Protection against electric shock in normal service (direct contact) . 36
6.3 Protection against electric shock in case of a fault condition (indirect contact) . 39
7 Thermal requirements . 41
7.1 Heating test . 41
7.2 Temperature measurement . 42
7.3 Limits of TEMPERATURE RISE . 44
7.4 Loading test . 45
7.5 Commutators and slip-rings . 46
8 THERMAL PROTECTION . 46
8.1 General requirements . 46
8.2 Construction . 46
8.3 Location . 46
8.4 Operating capacity . 47
8.5 Operation . 47
8.6 Resetting . 47
8.7 Indication . 47
9 Abnormal operation . 47
9.1 General requirements . 47
9.2 Stalled fan test . 48
9.3 Short circuit test . 48
9.4 Overload test . 49
9.5 Capacitors short circuit . 49
10 Connection to the supply network . 49
10.1 Supply voltage . 49
10.2 Multi-supply voltage . 50
10.3 Means of connection to the SUPPLY CIRCUIT . 50
10.4 Marking of terminals . 50
10.5 PROTECTIVE CIRCUIT . 51
10.6 Cable anchorage . 52
10.7 Inlet openings . 53
10.8 SUPPLY CIRCUIT on/off switching device . 53
10.9 Supply cables . 54
10.10 Supply coupling device (attachment plug) . 55
11 Output . 55
11.1 RATED NO-LOAD VOLTAGE . 55
11.2 TYPE TEST values of the CONVENTIONAL LOAD VOLTAGE . 58
11.3 Mechanical switching devices used to adjust output . 59
11.4 WELDING CIRCUIT connections . 60
11.5 Power supply to external devices connected to the WELDING CIRCUIT . 61
11.6 Auxiliary power supply . 61
11.7 Welding cables . 61
12 CONTROL CIRCUITs . 62
12.1 General requirement . 62
12.2 Isolation of CONTROL CIRCUITs . 62
12.3 WORKING VOLTAGEs of remote CONTROL CIRCUITs . 62
13 HAZARD REDUCING DEVICE . 62
13.1 General requirements . 62
13.2 Types of HAZARD REDUCING DEVICES . 63
13.3 Requirements for HAZARD REDUCING DEVICEs . 63
14 Mechanical provisions . 64
14.1 General requirements . 64
14.2 Enclosure . 64
14.3 Handling means . 65
14.4 Drop withstand . 65
14.5 Tilting stability . 66
15 RATING PLATE . 66
15.1 General requirements . 66
15.2 Description . 66
15.3 Contents . 67
15.4 Tolerances . 70
15.5 Direction of rotation . 71
16 Adjustment of the output . 71
16.1 Type of adjustment . 71
16.2 Marking of the adjusting device . 71
16.3 Indication of current or voltage control . 72
17 Instructions and markings . 72
17.1 Instructions . 72
17.2 Markings . 73
Annex A (informative normative) Nominal voltages of supply networks . 74
Annex B (informative) Example of a combined dielectric test . 77
Annex C (normative) Unbalanced load in case of AC tungsten inert-gas WELDING
POWER SOURCES . 78
C.1 General . 78
C.2 Unbalanced load . 79
C.3 Example for an unbalanced load . 79
Annex D (informative) Extrapolation of temperature to time of shutdown . 81
– 4 – IEC 60974-1:2021 RLV © IEC 2021
Annex E (normative) Construction of SUPPLY CIRCUIT terminals .
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