1.1 本试验方法用于确定热衰减系数（HAF）、有效热衰减系数和屏蔽机械强度（SMS），该屏蔽安装在带电工具或货架杆上，用于保护接触电弧的工人。 1.2 本工人保护试验方法中使用的材料是连接在带电工具或二层架杆上的防护罩。 1.3 本试验方法中所述的防护罩应是透明的，且应易于从带电工具或二层架杆上连接和拆除。 1.4 本试验方法中所述的防护罩具有24 in。（0.61-m）直径，可用于大多数应用，但对于特殊情况，防护罩可具有不同的尺寸，以满足应用的保护要求。 1.5 本标准应用于测量和描述材料、产品或组件对入射能量（热能- 在受控的实验室条件下电弧产生的辐射波、对流波、辐射波和压力波），并且不打算预测来自光的损害、除了测量的压力和热方面之外的合成压力冲击。 1.6 以英寸-磅单位表示的值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.7 本标准不得用于描述或评估材料、产品或组件在实际火灾条件下的火灾危险或火灾风险。然而，该测试的结果可作为火灾评估的要素，该评估考虑了与特定最终用途火灾危险评估相关的所有因素。 1.8 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体预防措施，请参阅第节 7. . 1.9 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本试验方法旨在确定屏蔽材料的热衰减系数（HAF）和工人所在位置的有效热衰减系数。这可以通过测量连接在带电工具（热棒）或二层架杆上的屏蔽物引起的电弧入射能级的降低来实现，该屏蔽物设计用于保护暴露在电弧中的工人。 屏蔽机械强度（SMS）可以从HAF测试期间对每个镜头的高速视频记录的视觉观察中获得。 5.1.1 由于电弧暴露的可变性，各个传感器可能会产生不同的传热值和压力。根据第节评估每个传感器的结果 12 . 5.2 该测试方法将防护罩和热传感器保持在静态、垂直位置，除暴露导致的移动外，不涉及移动。 5.3 本试验方法规定了一组标准的暴露条件。不同的暴露条件可能产生不同的结果。 注1: 除标准暴露条件外，还可使用代表预期危险的其他条件，并应在引用该数据时予以报告。

1.1 This test method is used to determine the heat attenuation factor (HAF), the effective heat attenuation factor (EHAF), and the shields mechanical strength (SMS) of a shield attached on live line tools or racking rods intended for protection of workers exposed to electric arcs. 1.2 The materials used in this test method of worker protection are in the form of a shield attached on live line tools or on the racking rods. 1.3 The protective shield described in this test method shall be transparent and shall be easily attached and removed from live line tools or from racking rods. 1.4 The protective shield described in this test method has 24-in. (0.61-m) diameter and can be used for most applications, however for special cases, the shield can have different sizes to suit the protective requirements of the application. 1.5 This standard shall be used to measure and describe the properties of materials, products, or assemblies in response to incident energies (thermal-convective, and radiant and pressure wave) generated by an electric arc under controlled laboratory conditions and does not purport to predict damage from light, resultant pressure impact other than the pressure and thermal aspects measured. 1.6 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.7 This standard shall not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire assessment, which takes into account all of the factors, which are pertinent to an assessment of the fire hazard of a particular end use. 1.8 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 precautions, see Section 7 . 1.9 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 intended for determining the heat attenuation factor (HAF) of a shield material and the effective heat attenuation factor (EHAF) at the location of the worker. This can be obtained by measuring the reduction of the arc incident energy levels caused by a shield attached on a live line tool (hot stick) or on a racking rod and designed for protection for workers exposed to electric arcs. The shield mechanical strength (SMS) can be obtained from visual observations of the high speed video recordings of each shot during HAF tests. 5.1.1 Because of the variability of the arc exposure, different heat transmission values and pressure may result for individual sensors. The results of each sensor are evaluated in accordance with Section 12 . 5.2 This test method maintains the shield and the heat sensors in a static, vertical position and does not involve movement except that resulting from the exposure. 5.3 This test method specifies a standard set of exposure conditions. Different exposure conditions may produce different results. Note 1: In addition to the standard set of exposure conditions, other conditions representative of the expected hazard may be used and shall be reported should this data be cited.