1.1 这是一个火灾测试响应标准。 1.2 本试验方法提供了一种方法，当电缆样品（不包括附件）受到指定的燃烧点火源并在通风良好的条件下自由燃烧时，通过燃烧电缆或光纤电缆中的电绝缘材料来测量释放的热量和烟雾遮蔽。还测量了火焰传播电缆的损坏、焦炭长度和质量损失。 1.3 该测试方法提供了两种不同的方案，用于在将材料制成电缆试样时，将其暴露于火源（约20kW）下，持续20分钟的测试时间。 使用它来确定单芯和多芯电缆或光纤中所含材料的热释放、烟雾释放、火焰传播和质量损失特性。 1.4 本试验方法没有提供有关绝缘电缆或光纤电缆材料在火灾条件下（本试验方法中专门使用的材料除外）的防火性能的信息，也没有测量这些电缆中的材料对发展中的火灾条件的贡献。 1.5 获得了描述从点火到试验结束的燃烧行为的数据。 1.6 该测试设备适用于测量燃烧气体中某些有毒气体的浓度（参见 附录X4 ). 1.7 以国际单位制表示的数值应视为标准（见 IEEE/ASTM SI-10标准 ). 括号中给出的值是英寸磅单位的数学转换，仅供参考，不被视为标准。 1.8 本标准测量并描述了材料、产品或组件在受控条件下对热量和火焰的响应，但其本身并未包含在实际火灾条件下对材料、产品和组件进行火灾危险或火灾风险评估所需的所有因素 1.9 火灾测试具有内在的危险性。在进行这些试验时，应为人员和财产提供足够的保护。 1.10 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.11 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该测试方法提供了一种测量各种火灾测试响应特性的方法，这些特性与热量和烟雾释放有关，并且是由绝缘电缆或光纤电缆制成电缆并安装在垂直电缆桥架上的材料燃烧引起的。通过丙烷气体燃烧器点火后，允许试样在通风良好的条件下自由燃烧。本试验方法中使用的点火源在实践中也被描述为预混火焰燃烧点火源 2020年3月 ，其中包含点火源的详尽汇编。 5.2 热量释放的速率通常用作所产生的火灾强度的指示。关于放热率重要性的一般考虑在 附录X1 以及热释放计算的注意事项 附录X2 . 5.3 通过该测试方法可测量的其他火灾测试响应特性有助于做出消防安全决策。该试验方法也用于测量烟雾遮蔽度。 这里描述的设备也可用于测量烟雾的气体成分；烟雾中最重要的气体成分是存在于所有火灾中的碳氧化物。碳氧化物是燃烧完整性的主要指标，通常用作火灾危险性评估计算的一部分，并用于提高热释放测量的准确性。 5.4 测试限制: 5.4.1 本试验中测得的火灾试验响应特性代表了试样在某些特定条件下的表现方式。 当被制成所考虑的结构的电缆时，不要认为它们代表了测试材料的一般防火性能。 5.4.2 特别是，在没有充足空气循环的情况下，该测试不太可能充分反映密闭空间中电缆的火灾行为。 5.4.3 这是一次中等规模的测试，其结果对大规模火灾的可预测性尚未确定。存在一些信息，建议对一些大型- 规模场景。

1.1 This is a fire-test-response standard. 1.2 This test method provides a means to measure the heat released and smoke obscuration by burning the electrical insulating materials contained in electrical or optical fiber cables when the cable specimens, excluding accessories, are subjected to a specified flaming ignition source and burn freely under well ventilated conditions. Flame propagation cable damage, by char length, and mass loss are also measured. 1.3 This test method provides two different protocols for exposing the materials, when made into cable specimens, to an ignition source (approximately 20 kW), for a 20 min test duration. Use it to determine the heat release, smoke release, flame propagation and mass loss characteristics of the materials contained in single and multiconductor electrical or optical fiber cables. 1.4 This test method does not provide information on the fire performance of materials insulating electrical or optical fiber cables in fire conditions other than the ones specifically used in this test method nor does it measure the contribution of the materials in those cables to a developing fire condition. 1.5 Data describing the burning behavior from ignition to the end of the test are obtained. 1.6 This test equipment is suitable for measuring the concentrations of certain toxic gas species in the combustion gases (see Appendix X4 ). 1.7 The values stated in SI units are to be regarded as standard (see IEEE/ASTM SI-10 ). The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.8 This standard measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products or assemblies under actual fire conditions 1.9 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. 1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method provides a means to measure a variety of fire-test-response characteristics associated with heat and smoke release and resulting from burning the materials insulating electrical or optical fiber cables, when made into cables and installed on a vertical cable tray. The specimens are allowed to burn freely under well ventilated conditions after ignition by means of a propane gas burner. The ignition source used in this test method is also described as a premixed flame flaming ignition source in Practice E3020 , which contains an exhaustive compilation of ignition sources. 5.2 The rate of heat release often serves as an indication of the intensity of the fire generated. General considerations of the importance of heat release rate are discussed in Appendix X1 and considerations for heat release calculations are in Appendix X2 . 5.3 Other fire-test-response characteristics that are measurable by this test method are useful to make decisions on fire safety. The test method is also used for measuring smoke obscuration. The apparatus described here is also useful to measure gaseous components of smoke; the most important gaseous components of smoke are the carbon oxides, present in all fires. The carbon oxides are major indicators of the completeness of combustion and are often used as part of fire hazard assessment calculations and to improve the accuracy of heat release measurements. 5.4 Test Limitations: 5.4.1 The fire-test-response characteristics measured in this test are a representation of the manner in which the specimens tested behave under certain specific conditions. Do not assume they are representative of a generic fire performance of the materials tested when made into cables of the construction under consideration. 5.4.2 In particular, it is unlikely that this test is an adequate representation of the fire behavior of cables in confined spaces, without abundant circulation of air. 5.4.3 This is an intermediate-scale test, and the predictability of its results to large scale fires has not been determined. Some information exists to suggest validation with regard to some large-scale scenarios.