新的！IEC 60332-3-23:20 18作为IEC 60332-3-23:20 18 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 60332-3-23:20 18涵盖B类测试方法，用于在规定条件下评估垂直安装的电线或电缆（电气或光学）的垂直火焰蔓延。 本文件涉及安装在测试梯上的电缆，以实现3.5 L/m测试样品的非金属材料的标称总体积。火焰施加时间为40分钟。安装方法使用标准梯子的前部。该类别旨在用于需要评估中等体积非金属材料的一般用途。该试验旨在进行型式认可试验。试验用电缆的选择要求见附录A。火焰蔓延被测量为电缆样品的损坏程度。该程序可用于证明电缆限制火焰蔓延的能力。建议的性能要求见附件B。这第二版取消并取代了2000年出版的第一版和修正案1:20 08。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: a)对标题和其他地方进行了调整，以强调该标准适用于光纤电缆以及金属导体类型； b)为了提高重复性和再现性，已经更好地定义了电缆安装在梯子上的方式的细节。 根据IEC指南104，它具有团体安全出版物的地位。

NEW!IEC 60332-3-23:2018 is available as IEC 60332-3-23:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60332-3-23:2018 covers category B for methods of test for the assessment of vertical flame spread of vertically-mounted bunched wires or cables, electrical or optical, under defined conditions.
This document relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 3,5 l/m of test sample. The flame application time is 40 min. The method of mounting uses the front of the standard ladder. The category is intended for general use where medium volumes of non-metallic material are required to be evaluated. The test is intended for type approval testing. The requirements for the selection of cables for testing are given in Annex A. The flame spread is measured as the extent of damage of the cable sample. This procedure can be used to demonstrate the cable’s ability to limit flame spread. A recommended performance requirement is given in Annex B. This second edition cancels and replaces the first edition published in 2000 and Amendment 1:2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) adjustments have been made to the title, and elsewhere, to emphasise the standard is applicable to optical fibre cables as well as metallic conductor types;
b) details of the way in which cables are mounted on the ladder have been better defined in order to improve repeatability and reproducibility.
It has the status of a group safety publication in accordance with IEC Guide 104.