1.1 这些测试方法涵盖了塑料防护装置和组装防护装置系统的三种电气测试。它们是: 1.1.1 方法A- 耐压试验， 1.1.2 方法B- 闪络电压，以及 1.1.3 方法C- 漏电流。 1.1.4 本规范涵盖工人用于电力电路临时绝缘的塑料防护设备和防护系统。 1.1.5 本规范涵盖的塑料防护设备仅适用于瞬时或电刷接触。最大使用电压包含在 表1 和 表2 . 1.2 这些测试方法涵盖但不限于以下典型防护装置: 1.2.1 导体防护罩和连接盖如下: 1.2.1.1 护线员， 1.2.1.2 线路保护连接器， 1.2.1.3 绝缘体盖、 1.2.1.4 死端盖， 1.2.1.5 巴士防护装置，以及 1.2.1.6 巴士“T”警卫。 1.2.2 结构和装置包括以下内容: 1.2.2.1 护杆、 1.2.2.2 脊销盖， 1.2.2.3 开关刀片盖、 1.2.2.4 护臂、 1.2.2.5 切口盖， 1.2.2.6 结构性障碍，以及 1.2.2.7 横臂护板。 1.3 该设备的用户通常会准备正确使用和维护的说明。 1.4 该设备的使用和维护超出了这些测试方法的范围。 1.5 以英寸-磅单位表示的值应被视为标准值。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。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。1.7 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====== 4.1 所有三项测试均可用于产品设计确认。 4.2 本说明书涵盖了制造商指定的最低电气、化学和物理性能以及确定这些性能的详细程序。买方可以选择执行或已经执行任何这些测试，并可以拒绝不符合标准的设备。关于不符合质量标准的索赔由制造商验证。4.3 塑料防护设备用于防止工人意外接触电刷。应在最大使用电压和测试验证电压之间提供安全裕度。这种关系如中所示 表1 和 表2 该设备仅设计用于相对地或覆盖相对覆盖相曝光。 附注1: 橡胶绝缘设备实际上仅限于设计规范标准中的4类材料。塑料防护设备的设计可以超越这些电压，并提供令人满意的工人保护。橡胶和塑料防护设备的使用标准存在主要差异。橡胶绝缘设备的每个手套、套管或其他制品对于其可以使用的相间电压和其测试的等级或验证电压都具有给定的安全系数。然而，塑料防护设备的设计仅在相对地暴露中使用时才能提供令人满意的安全系数。如果暴露是相间的，那么只有当暴露是相间-相间-相间-相间时，才能提供令人满意的安全系数。 4.4 工作实践因用户而异，取决于许多因素。这些可能包括但不限于操作系统电压、结构设计、工作程序技术、天气条件等。因此，除了由于设计限制而在本说明书中阐述的限制之外，该设备的使用和维护超出了本说明书的范围。 4.5 这类防护设备的使用者通常的做法和责任是准备完整的说明和规定来详细管理这种设备的正确和安全使用。

1.1 These test methods cover three electrical tests on plastic guards and assembled guard systems. They are: 1.1.1 Method A— Withstand voltage proof test, 1.1.2 Method B— Flashover voltage, and 1.1.3 Method C— Leakage current. 1.1.4 This specification covers plastic guard equipment and guard systems used by workers for temporary insulation on electric power circuits. 1.1.5 Plastic guard equipment covered by this specification is rated for momentary, or brush contact only. Maximum-use voltages are covered in Table 1 and Table 2 . 1.2 These test methods cover, but are not limited to, the following typical guards: 1.2.1 Conductor Guards and Connecting Covers as follows: 1.2.1.1 Line guards, 1.2.1.2 Line guard connectors, 1.2.1.3 Insulator covers, 1.2.1.4 Dead-end covers, 1.2.1.5 Bus guards, and 1.2.1.6 Bus “T” guards. 1.2.2 Structure and Apparatus Covers as follows: 1.2.2.1 Pole guards, 1.2.2.2 Ridge pin covers, 1.2.2.3 Switch blade covers, 1.2.2.4 Arm guards, 1.2.2.5 Cutout covers, 1.2.2.6 Structural barriers, and 1.2.2.7 Cross arm guard. 1.3 It is common practice for the user of this equipment to prepare instructions for the correct use and maintenance. 1.4 The use and maintenance of this equipment is beyond the scope of these test methods. 1.5 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. 1.6 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. 1.7 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 ====== 4.1 All three tests may be used for product design qualification. 4.2 This specification covers the minimum electrical, chemical, and physical properties designated by the manufacturer and the detailed procedures by which such properties are to be determined. The purchaser has the option to perform or have performed any of these tests and may reject equipment that fails to meet the standard criteria. Claims concerning failure to meet the specification are subject to verification by the manufacturer. 4.3 Plastic guard equipment is used for protection against accidental brush contact by the worker. A margin of safety shall be provided between the maximum voltage at which they are used and the proof-test voltage at which they are tested. This relationship is shown in Table 1 and Table 2 . The equipment is designed only for phase-to-ground or covered phase-to-covered-phase exposure. Note 1: Rubber insulating equipment is realistically limited to Class 4 material in the design specification standards. Plastic guard equipment has been designed to go beyond these voltages and provide a satisfactory degree of worker protection. Major differences exist in use criteria between the rubber and the plastic guard equipment. Each glove, sleeve, or other article of rubber insulating equipment has a given safety factor for the phase to phase voltage on which it may be used and the class or proof voltage at which it is tested. Plastic guard equipment, however, is designed to provide a satisfactory safety factor only when used in a phase-to-ground exposure. If exposure is phase-to-phase, then a satisfactory safety factor is only provided if the exposure is covered-phase-to-covered-phase. 4.4 Work practices vary from user to user, dependent upon many factors. These may include, but are not limited to, operating system voltages, construction design, work procedure techniques, weather conditions, etc. Therefore, except for the restrictions set forth in this specification because of design limitations, the use and maintenance of this equipment is beyond the scope of this specification. 4.5 It is common practice and the responsibility of the user of this type of protective equipment to prepare complete instructions and regulations to govern in detail the correct and safe use of such equipment.