IEC 61557-1:20 19作为IEC 61557-1:20 19 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 61557-1:20 19规定了适用于测试标称电压高达1 000 V AC和1 500 V DC的低压配电系统电气安全的测量和监控设备的一般要求。当测量设备或测量装置涉及本系列标准所涵盖的各种测量设备的测量任务时，则本系列中与每个测量任务相关的部分适用。IEC 61557的其他部分可以规定额外的要求或偏差。本文件不涵盖功能安全或网络安全。IEC 61557-1:2019年取消并取代2007年出版的第二版。本版构成技术修订版。与上一版相比，第三版包含以下重大技术变更: a)符合IEC 60050的术语； b)根据ISO/IEC指南98-3:20 08(GUM)4.2中的公式修订的不确定度测量； c)安全和EMC要求的更新参考； d)标记和操作说明的更新参考； e)更新了安全性和EMC测试参考； f)附件A载有对口香糖的解释； g)附件B涉及环境方面。

IEC 61557-1:2019 is available as IEC 61557-1:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61557-1:2019 specifies the general requirements applicable to measuring and monitoring equipment for testing the electrical safety in low-voltage distribution systems with nominal voltages up to 1 000 V AC and 1 500 V DC. When measuring equipment or measuring installations involve measurement tasks of various measuring equipment covered by this series of standards, then the part of this series relevant to each of the measurement tasks is applicable. Other parts of IEC 61557 can specify additional requirements or deviations. This document does not cover functional safety or cybersecurity. IEC 61557-1:2019 cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This third edition includes the following significant technical changes with respect to the previous edition:
a) terms aligned with IEC 60050;
b) measurement of uncertainty revised according to the equations in 4.2 of ISO/IEC Guide 98-3:2008 (GUM);
c) updated references for safety and EMC requirements;
d) updated references for marking and operating instructions;
e) updated references for testing safety and EMC;
f) Annex A contains an explanation of GUM;
g) Annex B addresses environmental aspects.