IEC 60974-1:20 21作为IEC 60974-1:20 21 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60974-1:20 21适用于为工业和专业用途而设计的弧焊和相关工艺的电源，由不超过1 000 V的电压供电，由电池供电或由机械装置驱动。本文件规定了焊接电源和等离子切割系统的安全和性能要求。本第六版取消并取代2017年发布的第五版和修正案1:20 19。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: -表1，按字母顺序排列-添加的术语参考列表； -间隙和爬电距离参考文件变更为IEC 60664-1:20 20； -6.1.2和6.1.3修改为遵循IEC 60664-1用于合理化电压的主电源的基本绝缘尺寸； -6.2.2的异常电容器测试移至新的第9.5款； -修改了6.2.5和6.3.6以使用接触电流测量网络，并增加了固定和电源电压容限要求； -16.3新结构及对显示电压值的精度要求； -将附件A改为规范性附件，增加表A.2和表A.3； -附件L对标准化符号的编辑更新； -根据IEC 62301:2011重新起草附件M中的效率和空闲状态功率测量； -增加了附件N测量网络加权放行-固定。

IEC 60974-1:2021 is available as IEC 60974-1:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60974-1:2021 is applicable to power sources for arc welding and allied processes designed for industrial and professional use, and supplied by a voltage not exceeding 1 000 V, battery supplied or driven by mechanical means. This document specifies safety and performance requirements of welding power sources and plasma cutting systems. 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:
- Table 1 with an alphabetical cross-reference listing of terms added;
- clearance and creepage distance reference document changed to IEC 60664-1:2020;
- 6.1.2 and 6.1.3 modified to follow IEC 60664-1 basic insulation dimensioning for mains supply with rationalized voltages;
- abnormal capacitor test of 6.2.2 moved to new Subclause 9.5;
- 6.2.5 and 6.3.6 modified to use touch current measuring network weighted for letgo-immobilization and supply voltage tolerance requirement added;
- 16.3 new structure and accuracy requirement for displayed voltage value;
- Annex A changed to normative and Table A.2 and Table A.3 added;
- Annex L editorial update to standardized symbols;
- redraft of efficiency and idle state power measurement in Annex M based on IEC 62301:2011;
- Annex N measurement network weighted for letgo-immobilization added.