1.1 这是火灾测试响应标准。 1.2 几种火灾试验响应特性，包括持续燃烧的时间、热释放速率、释放的总热量、有效燃烧热和比熄灭面积；在恒定辐射热通量下通过本试验方法测量或计算。有关具体限制，请参见 5.7 和截面 6. . 1.3 当电缆试样（不包括附件）经受辐射热时，通过燃烧电缆或光缆中包含的电气绝缘材料进行试验。 1.4 以国际单位制表示的数值应视为标准。 括号中给出的值仅供参考。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 有关具体的预防说明，请参阅第节 7. . 1.6 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，但其本身并不包括在实际火灾条件下对材料、产品或组件进行火灾危险或火灾风险评估所需的所有因素。 1.7 防火测试本身就很危险。在进行这些测试时，应采取适当的人员和财产保护措施。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法用于确定由于将电缆或光缆中包含的绝缘材料暴露于锥形量热器装置中规定的初始试验热流中而导致的热释放速率和许多其他火灾试验响应特性。 5.2 定量热释放测量为电缆或光缆的设计和产品开发提供了潜在有用的信息。 5.3 热释放测量通过定量测量组件和复合材料修改引起的防火性能的具体变化，为产品开发提供了有用的信息。如果产品在相关火灾暴露条件下不会在其表面传播火焰，则本试验方法中的热释放数据将无法预测产品行为。 5.4 通过本试验方法确定的耐火试验响应特性受用作试样的材料厚度的影响，无论是作为斑块还是作为电线或电缆上的涂层。 使用的导线或电缆的直径也会影响测试结果。 5.5 辐射暴露用作本试验方法的能源。这种类型的光源已用于比较在垂直电缆槽配置中燃烧时电缆内绝缘材料的热释放速率和火焰传播研究（试验方法 D5424 和 D5537 ) ( 2- 9 ). 尚未建立明确的关系。 5.6 与传播电缆火灾和非传播火灾之间的临界极限相对应的热释放率值未知。 5.7 本试验方法不确定净燃烧热。 5.8 尚未证明该试验方法能够预测电缆或光缆在全尺寸火灾中的响应。特别是，本试验方法未涉及电缆在全尺寸火灾中的自熄特性。

1.1 This is a fire-test-response standard. 1.2 Several fire-test-response characteristics, including the time to sustained flaming, heat release rate, total heat released, effective heat of combustion, and specific extinction area; are measured or calculated by this test method at a constant radiant heat flux. For specific limitations see also 5.7 and Section 6 . 1.3 The tests are conducted by burning the electrical insulating materials contained in electrical or optical fiber cables when the cable test specimens, excluding accessories, are subjected to radiant heat. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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. For specific precautionary statements, see Section 7 . 1.6 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. 1.7 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. 1.8 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 is used to determine the heat release rate and a number of other fire-test-response characteristics as a result of exposing insulating materials contained in electrical or optical cables to a prescribed initial test heat flux in the cone calorimeter apparatus. 5.2 Quantitative heat release measurements provide information that is potentially useful for design of electrical or optical cables, and product development. 5.3 Heat release measurements provide useful information for product development by giving a quantitative measure of specific changes in fire performance caused by component and composite modifications. Heat release data from this test method will not be predictive of product behavior if the product will not spread flame over its surface under the fire exposure conditions of interest. 5.4 The fire-test-response characteristics determined by this test method are affected by the thickness of the material used as test specimen, whether as a plaque or as coating on a wire or cable. The diameter of the wire or cable used will also affect the test results. 5.5 A radiant exposure is used as an energy source for this test method. This type of source has been used for comparison with heat release rate and flame spread studies of insulating materials constructed into cables when burning in a vertical cable tray configuration (Test Methods D5424 and D5537 ) ( 2- 9 ). No definitive relationships have been established. 5.6 The value of heat release rate corresponding to the critical limit between propagating cable fires and non-propagating fires is not known. 5.7 This test method does not determine the net heat of combustion. 5.8 It has not been demonstrated that this test method is capable of predicting the response of electrical or optical fiber cables in a full scale fire. In particular, this test method does not address the self-extinguishing characteristics of the cables in a full scale fire.