IEC 60695-11-20:20 15描述了一种由两个小规模实验室测试程序组成的测试方法，旨在比较电工产品中使用的不同材料的燃烧行为。垂直取向的棒状试样或水平取向的板状试样暴露于标称热功率为500W的小火焰点火源。该测试方法使用两种测试样本配置来对材料性能进行分类。矩形棒状试样用于评估可燃性和燃烧行为，方形板状试样用于评估试样的抗烧穿性，如8.3.3所定义。本试验方法仅适用于根据IEC 60695-11-10分类为V-0或V-1的材料。本试验方法仅适用于根据ISO 845测定的表观密度大于250 kg/m3的固体和多孔材料。该方法不适用于因其薄而从施加的火焰收缩而不点燃的材料。所描述的测试方法提供了可用于质量保证、产品组成材料的预选或验证最终产品中所用材料所需的最低可燃性分类的分类。如果用于预选，则应在试样厚度等于产品应用中使用的最小厚度时获得阳性结果。获得的结果提供了一些关于材料在使用中的行为的信息，但其本身不能保证使用中的安全性能。第二版取消并取代了2003年发布的IEC 60695-11-20的合并版本。本版构成技术修订版。与第一版相比的主要变化如下: -零件标题已修改为Singular-500 W火焰测试方法； -为了使IEC 60695-11-10与IEC 60695-11-20保持一致，对整个文件进行了编辑变更； -对引言进行了修改，以澄清测试方法的描述； -为了澄清，对范围进行了修改； -已从文件中删除术语“固定装置”的所有出现； -优选厚度值已添加至7.2和7.3； -7.4.4:“厚度测量”现在编号为7.5，其中增加了新的表1-厚度公差； -增加了新的子条款8.1.4“化妆棉的调理”； -8.2.3阐明了试验火焰对扭曲试样的应用；-在图5和图6中增加了解释性注释，更新了参考书目并增加了参考文献。本基本安全出版物旨在供技术委员会根据IEC指南104和ISO/IEC指南51中规定的原则编制标准时使用。本标准应与IEC 60695-13-3结合使用。 关键词:试验火焰、火灾危险、火灾试验方法

IEC 60695-11-20:2015 describes a test method consisting of two small-scale laboratory test procedures which is intended to compare the burning behaviour of different materials used in electrotechnical products. Vertically oriented bar specimens or horizontally oriented plate test specimens are exposed to a small flame ignition source with a nominal thermal power of 500 W. The test method uses two test specimen configurations to classify material performance. Rectangular bar-shaped test specimens are used to assess ignitability and burning behaviour, and square plate test specimens are used to assess the resistance of the test specimen to burn-through, as defined in 8.3.3. This test method only applies to materials that have been classified as V-0 or V-1 according to IEC 60695-11-10. This test method is only applicable to solid and cellular materials that have an apparent density of more than 250 kg/m3, determined in accordance with ISO 845. The method does not apply to materials that shrink away from the applied flame without igniting due to their thinness. The test method described provides classifications which may be used for quality assurance, the pre-selection of component materials of products, or to verify the required minimum flammability classification of materials used in end products. If used for pre-selection, then positive results shall be obtained at a test specimen thickness which equals the smallest thickness used in the product application. The results obtained provide some information about the behaviour of materials in service, but cannot by themselves assure safe performance in service. This second edition cancels and replaces the consolidated version of IEC 60695-11-20 published in 2003. This edition constitutes a technical revision. The main changes with respect to the first edition are as follows:
- The Part title has been modified to the singular - 500 W flame test method;
- Editorial changes have been made throughout the document for the purpose of aligning IEC 60695-11-10 with IEC 60695-11-20;
- The Introduction has been modified to clarify the description of the test method;
- The Scope has been modified for clarification;
- All occurrences of the term "fixture" have been deleted from the document;
- Preferred thickness values have been added to 7.2 and 7.3;
- 7.4.4: 'Thickness measurement' is now numbered 7.5 to which a new Table 1 - Thickness tolerances has been added;
- New Subclause 8.1.4 'Conditioning of the cotton pad' has been added;
- 8.2.3 clarifies the application of the test flame to distorted specimens;
- Explanatory notes have been added to Figures 5 and 6 and the Bibliography has been updated and references added. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. This standard is to be used in conjunction with IEC 60695-13-3. Key words: Test flames,Fire Hazard, Fire Test Method