IEC 60974-1:2021

Arc welding equipment - Part 1: Welding power sources

IEC 60974-1:2021

Name:IEC 60974-1:2021   Standard name:Arc welding equipment - Part 1: Welding power sources
Standard number:IEC 60974-1:2021   language:English language
Release Date:28-Jun-2021   technical committee:TC 26 - Electric welding
Drafting committee:WG 1 - TC 26/WG 1   ICS number:25.160.30 - Welding equipment

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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