prEN IEC 60974-1:2025

Arc welding equipment - Part 1: Welding power sources

Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen

Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage

Oprema za obločno varjenje - 1. del: Viri varilnega toka

General Information

• Status: Not Published
• Publication Date: 10-Jan-2027
• ICS: 25.160.30 - Welding equipment
• Technical Committee: CLC/TC 26 - Electric welding
• Current Stage: 4020 - Enquiry circulated - Enquiry
• Start Date: 20-Jun-2025
• Due Date: 06-Nov-2025
• Completion Date: 20-Jun-2025
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 2019/1784 - COMMISSION REGULATION (EU) 2019/1784 of 1 October 2019 laying down ecodesign requirements for welding equipment pursuant to Directive 2009/125/EC of the European Parliament and of the Council
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/559 - [C(2018) 3309 final] Ecodesign requirements for welding equipment
• Ref Project: oSIST prEN IEC 60974-1:2025 - Arc welding equipment - Part 1: Welding power sources

Relations

• Revises: EN IEC 60974-1:2022/A13:2025 - Arc welding equipment - Part 1: Welding power sources
• Effective Date: 29-Apr-2025
• Revises: EN IEC 60974-1:2022/A12:2023 - Arc welding equipment - Part 1: Welding power sources
• Effective Date: 22-Oct-2024
• Revises: EN IEC 60974-1:2022/A11:2022 - Arc welding equipment - Part 1: Welding power sources
• Effective Date: 22-Oct-2024
• Revises: EN IEC 60974-1:2022 - Arc welding equipment - Part 1: Welding power sources
• Effective Date: 31-Oct-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Oprema za obločno varjenje - 1. del: Viri varilnega toka
Arc welding equipment - Part 1: Welding power sources
Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen
Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage
Ta slovenski standard je istoveten z: prEN IEC 60974-1:2025
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

26/776/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60974-1 ED7
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-06-20 2025-09-12
SUPERSEDES DOCUMENTS:
26/765/CD, 26/773/CC
IEC TC 26 : ELECTRIC WELDING
SECRETARIAT: SECRETARY:
Austria Mr Josef Feichtinger
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Arc welding equipment - Part 1: Welding power sources

PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

2 IEC 60974-1 ED7 © IEC 2025
2 CONTENTS
3 CONTENTS . 2
4 FOREWORD  . 7
5 1 Scope  . 9
6 2 Normative references  . 9
7 3 Terms and definitions  . 10
8 3.1 General terms  and definitions . 12
9 3.2 Terms and definitions related to BATTERY SYSTEMs  . 21
10 3.3 Terms and definitions related to efficiency and IDLE STATE power
11 measurement . 24
12 4 Environmental conditions  . 25
13 5 Tests  . 25
14 5.1 Test conditions  . 25
15 5.2 Measuring instruments  . 25
16 5.3 Conformity of components  . 26
17 5.4 TYPE TESTs  . 26
18 5.5 ROUTINE TESTs  . 27
19 6 Protection against electric shock  . 27
20 6.1 Insulation . 27
21 6.2 Protection against electric shock in normal service (direct contact)  . 34
22 6.3 Protection against electric shock in case of a fault condition (indirect
23 contact)  . 36
24 7 Thermal requirements  . 38
25 7.1 Heating test  . 38
26 7.2 Temperature measurement  . 39
27 7.3 Limits of TEMPERATURE RISE  . 41
28 7.4 Loading test . 42
29 7.5 Commutators and slip-rings  . 43
30 8 THERMAL PROTECTION  . 43
31 8.1 General requirements  . 43
32 8.2 Construction  . 43
33 8.3 Location  . 43
34 8.4 Operating capacity  . 43
35 8.5 Operation  . 44
36 8.6 Resetting  . 44
37 8.7 Indication . 44
38 9 Abnormal operation  . 44
39 9.1 General requirements  . 44
40 9.2 Stalled fan test  . 45
41 9.3 Short circuit test  . 45
42 9.4 Overload test  . 45
43 9.5 Capacitors short circuit  . 46
44 10 Connection to the supply network  . 46
45 10.1 Supply voltage  . 46
46 10.2 Multi-supply voltage  . 46
47 10.3 Means of connection to the SUPPLY CIRCUIT  . 47
48 10.4 Marking of terminals  . 47
49 10.5 PROTECTIVE CIRCUIT  . 47
50 10.6 Cable anchorage  . 49

IEC 60974-1 ED7 © IEC 2025 3
51 10.7 Inlet openings  . 50
52 10.8 SUPPLY CIRCUIT on/off switching device  . 50
53 10.9 Supply cables  . 51
54 10.10 Supply coupling device (attachment plug)  . 51
55 11 Output  . 51
56 11.1 RATED NO-LOAD VOLTAGE   . 51
57 11.2 TYPE TEST values of the CONVENTIONAL LOAD VOLTAGE  . 54
58 11.3 Mechanical switching devices used to adjust output  . 55
59 11.4 WELDING CIRCUIT connections  . 55
60 11.5 Power supply to external devices connected to the WELDING CIRCUIT  . 57
61 11.6 Auxiliary power supply  . 57
62 11.7 Welding cables  . 57
63 12 CONTROL CIRCUITs  . 58
64 12.1 General requirement  . 58
65 12.2 Isolation of CONTROL CIRCUITs  . 58
66 12.3 WORKING VOLTAGEs of remote CONTROL CIRCUITs  . 58
67 13 HAZARD REDUCING DEVICE  . 58
68 13.1 General requirements  . 58
69 13.2 Types of HAZARD REDUCING DEVICES  . 59
70 13.3 Requirements for HAZARD REDUCING DEVICEs  . 59
71 14 Mechanical provisions  . 60
72 14.1 General requirements  . 60
73 14.2 Enclosure  . 60
74 14.3 Handling means  . 60
75 14.4 Drop withstand  . 61
76 14.5 Tilting stability  . 62
77 15 RATING PLATE  . 62
78 15.1 General requirements  . 62
79 15.2 Description  . 62
80 15.3 Contents  . 63
81 15.4 Tolerances  . 66
82 15.5 Direction of rotation  . 66
83 16 Adjustment of the output  . 66
84 16.1 Type of adjustment  . 66
85 16.2 Marking of the adjusting device  . 66
86 16.3 Indication of current or voltage control  . 67
87 17 Instructions and markings  . 67
88 17.1 Instructions  . 67
89 17.2 Markings  . 68
90 Annex A (normative) Nominal voltages of supply networks  . 70
91 Annex B (informative) Example of a combined dielectric test  . 73
92 Annex C (normative) Unbalanced load in case of AC tungsten inert-gas WELDING
93   . 74
POWER SOURCES
94 C.1 General  . 74
95 C.2 Unbalanced load . 74
96 C.3 Example for an unbalanced load  . 75
97 Annex D (informative) Extrapolation of temperature to time of shutdown  . 77
98 Annex E (normative) Construction of SUPPLY CIRCUIT terminals  . 78
99 E.1 Size of terminals  .
...