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，用于测量当电缆试样（不包括附件）受到指定的燃烧点火源的作用并在通风良好的条件下自由燃烧时，因燃烧电缆或光纤中包含的电绝缘材料而产生的烟雾遮蔽。 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。使用它来确定设计用于电缆桥架的单芯和多芯电缆或光纤中所含材料的火焰传播和烟雾释放特性。 1.4 本试验方法没有提供有关电缆或光纤电缆在火灾条件下的防火性能的信息，而本试验方法中专门使用的除外，也没有测量电缆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 测量了遮光烟雾的产生。 1.7 燃烧行为通过照片或视频记录或两者结合的方式进行可视化记录。 1.8 该测试设备适用于进行其他可选的测量，包括通过耗氧技术和重量损失测量燃烧试样的热释放速率。 1.9 另一组可选测量是燃烧气体中某些有毒气体的浓度。 1.10 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。（参见 IEEE/ASTM SI 10标准 .) 1.11 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。 1.12 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。 1.13 本标准用于测量和描述材料、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。 1.14 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 该试验方法提供了一种测量各种火灾试验响应特性的方法，这些特性与烟雾遮蔽有关，并由燃烧电缆或光纤电缆中的电绝缘材料引起。 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。 5.2 烟雾遮蔽量化了火灾中的能见度。 5.3 该测试方法也适用于测量热释放速率，作为可选测量。热量释放的速率通常用作所产生的火灾强度的指示。试验方法 第5537页 提供了使用本试验方法中使用的设备测量热量释放的方法。 5.4 通过该测试方法可测量的其他可选火灾测试响应特性有助于做出消防安全决策。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。它们是大气毒性和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。 某些材料特有的其他有毒气体对确定燃烧完全性不那么重要。 5.5 测试限制: 5.5.1 本试验方法中测得的火灾试验响应特性代表了试样在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。 5.5.2 特别是，在没有充足空气循环的情况下，这种测试方法不太可能充分代表密闭空间中电缆的火灾行为。 5.5.3 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。一些信息表明，它已经针对一些大规模场景进行了验证。

1.1 This is a fire-test-response standard. 1.2 This test method provides a means to measure the smoke obscuration resulting from burning 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. 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 flame propagation and smoke release characteristics of the materials contained in single and multiconductor electrical or optical fiber cables designed for use in cable trays. 1.4 This test method does not provide information on the fire performance of 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 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 The production of light obscuring smoke is measured. 1.7 The burning behavior is documented visually, by photographic or video recordings, or both. 1.8 The test equipment is suitable for making other, optional, measurements, including the rate of heat release of the burning specimen, by an oxygen consumption technique and weight loss. 1.9 Another set of optional measurements are the concentrations of certain toxic gas species in the combustion gases. 1.10 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. (See IEEE/ASTM SI 10 .) 1.11 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. 1.12 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. 1.13 This standard is used to measure and describe 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. 1.14 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 smoke obscuration and resulting from burning the electrical insulating materials contained in electrical or optical fiber cables. The specimens are allowed to burn freely under well ventilated conditions after ignition by means of a propane gas burner. 5.2 Smoke obscuration quantifies the visibility in fires. 5.3 This test method is also suitable for measuring the rate of heat release as an optional measurement. The rate of heat release often serves as an indication of the intensity of the fire generated. Test Method D5537 provides means for measuring heat release with the equipment used in this test method. 5.4 Other optional fire-test-response characteristics that are measurable by this test method are useful to make decisions on fire safety. The most important gaseous components of smoke are the carbon oxides, present in all fires. They are major indicators of the toxicity of the atmosphere and 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. Other toxic gases, which are specific to certain materials, are less crucial for determining combustion completeness. 5.5 Test Limitations: 5.5.1 The fire-test-response characteristics measured in this test method 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. 5.5.2 In particular, it is unlikely that this test method is an adequate representation of the fire behavior of cables in confined spaces, without abundant circulation of air. 5.5.3 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 that it has been validated against some large-scale scenarios.