IEC 60695-6-1:20 21作为IEC 60695-6-1:20 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 60695-6-1:20 21提供了以下方面的指导: a)烟雾遮蔽的光学测量； b)光学烟雾测试方法的一般方面； c)测试方法的考虑； d)烟雾测试数据的表达； e)光学烟雾数据与危害评估的相关性。 本基本安全出版物侧重于安全指南，主要供技术委员会根据IEC指南104和ISO/IEC指南51中规定的原则编写安全出版物时使用。 技术委员会的职责之一是在适用的情况下，在编制其出版物时利用基本安全出版物。本第三版取消并取代了2005年发布的IEC 60695-6-1第二版和修正案1:20 10。它构成技术修订。 与上一版相比，此版本包括以下重大技术变更: -已删除对IEC TS 60695-6-30（2016年撤回）的引用。 -已删除对IEC TS 60695-6-31（2016年撤回）的引用。 -插入了对ISO 5659-2的引用。 -范围包含一些附加文本。 -术语和定义已更新。 -第3.2款已更新。 -第7.1款已更新。 根据IEC指南104和ISO/IEC指南51，它具有基本安全出版物的地位。本国际标准应与IEC 60695-6-2一起使用。

IEC 60695-6-1:2021 is available as IEC 60695-6-1:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60695-6-1:2021 gives guidance on:
a) the optical measurement of obscuration of smoke;
b) general aspects of optical smoke test methods;
c) consideration of test methods;
d) expression of smoke test data;
e) the relevance of optical smoke data to hazard assessment.
This basic safety publication focusing on safety guidance is primarily intended for use by technical committees in the preparation of safety publications in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51.
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications.
This third edition cancels and replaces the second edition of IEC 60695-6-1 published in 2005 and Amendment 1:2010. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- References to IEC TS 60695-6-30 (withdrawn in 2016) have been removed.
- References to IEC TS 60695-6-31 (withdrawn in 2016) have been removed.
- References to ISO 5659-2 have been inserted.
- The scope contains some additional text.
- Terms and definitions have been updated.
- Subclause 3.2 has been updated.
- Subclause 7.1 has been updated.
It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51. This International Standard is to be used in conjunction with IEC 60695-6-2.