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 end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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IEC 60974‑1 has been prepared by IEC technical committee 26: Electric welding. It is an International Standard.

This sixth edition cancels and replaces the fifth edition published in 2017 and Amendment 1:2019. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

a) Table 1 with an alphabetical cross-reference listing of terms added;
b) clearance and creepage distance reference document changed to IEC 60664‑1:2020;
c) 6.1.2 and 6.1.3 modified to follow IEC 60664‑1basic insulation dimensioning for mains supply with rationalized voltages;
d) abnormal capacitor test of 6.2.2 moved to new Subclause 9.5;
e) 6.2.5 and 6.3.6 modified to use touch current measuring network weighted for letgo-immobilization and supply voltage tolerance requirement added;
f) 16.3 new structure and accuracy requirement for displayed voltage value ;
g) Annex A changed to normative and Table A.2 and Table A.3 added;
h) Annex L editorial update to standardized symbols;
i) redraft of efficiency and idle state power measurement in Annex M based on IEC 62301:2011;
j) Annex N measurement network weighted for letgo-immobilization added.

The text of this International Standard is based on the following documents:

FDIS	Report on voting
26/724/FDIS	26/727/RVD

Full information on the voting for its approval can be found in the report on voting indicated in the above table.

The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are described in greater detail at www.iec.ch/standardsdev/publications.

In this document, the following print types are used:

— conformity statements: in italic type.
— terms used throughout this document which have been defined in Clause 3: small roman capitals.

A list of all parts of the IEC 60974 series can be found, under the general title Arc welding equipment, on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the data related to the specific document. At this date, the document will be

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

BS EN IEC 60974-1:2021

Arc welding equipment - Welding power sources

Current

Published:

31 Dec 2022