IEC TS 60695-2-20:20 21描述了一种适用于固体电绝缘材料的测试方法，可以提供其测试样本。该测试测量当测试样本受到来自缠绕在测试样本周围的电加热丝的热量影响时点燃测试样本所需的时间。如果试样滴落，也记录滴落发生的时间。 该测试方法可用于提供分类，该分类可用于质量保证、IEC 60695-1-30中描述的产品材料的预选，或用于验证最终产品中使用的材料所需的最低分类。 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。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。除非相关出版物中特别提及或包含，否则本基本安全性出版物的要求、试验方法或试验条件将不适用。 IEC TS 60695-2-20的第三版取消并取代了2004年发布的IEC TS 60695-2-20的第二版。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: -添加了目录页 -更新范围（第1条） -更新了术语和定义，增加了新的相关术语（第3条） -更新原则（第4条） -更新的设备（条款5；建议将电源从。c.去华盛顿。具有恒定电流输出。推荐理由:华盛顿。技术更容易获得和处理，已经发现这提高了测试的重复性和再现性。 -更新了试样尺寸（6.2） -修订的测试程序（条款8） -修订的观察结果和测量结果（第9条） -修订测试结果评价（第10条） -修订的测试报告（条款11） -修订后的附件A:删除构象试验；测试前加热器导线绕组验证指南 -增加规范性附录B:HWCT PLC等级 -增加资料性附录C:在电子表格程序中确定测试电流（Ic）的校准曲线 -增加资料性附件D:精密度数据 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。

IEC TS 60695-2-20:2021 describes a test method that applies to solid electrical insulating materials of which test specimens can be provided. The test measures the time required to ignite a test specimen when it is affected by heat from an electrically heated wire wound around the test specimen. If the test specimen drips, the time at which this occurs is also recorded.
The test method can be used to provide classifications which can be used for quality assurance, the preselection of materials of products as described in IEC 60695-1-30, or to verify the required minimum classification of materials used in end products.
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.
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the relevant publications.
This third edition of IEC TS 60695-2-20 cancels and replaces the second edition of IEC TS 60695-2-20 published in 2004. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
– Contents page added
– Updated Scope (Clause 1)
– Updated Terms and Definitions, added new relevant terms (Clause 3)
– Updated Principle (Clause 4)
– Updated Apparatus (Clause 5; recommendation to change the power source from a.c. to d.c. with a constant current output. Reason for this recommendation: d.c. technology is easier to obtain and to handle, which has been found to improve the Repeatability and Reproducibility of the test.
– Updated Test specimen dimensions (6.2)
– Revised Test procedure (Clause 8)
– Revised Observations and measurements (Clause 9)
– Revised Evaluation of test results (Clause 10)
– Revised Test report (Clause 11)
– Revised Annex A: Deletion of conformational test; Guidance on verification of the heater wire winding before testing
– Addition of normative Annex B: HWCT PLC Classes
– Addition of informative Annex C: Calibration curve to determine test current (Ic) in a spreadsheet program
– Addition of informative Annex D: Precision data
It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51.
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.