1.1这些试验方法涵盖对塑料防护装置和组装防护系统的三次电气试验。他们是: 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 — 泄漏电流。 1.1.4本规范涵盖了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。最大使用电压见表1和表2。 1.2这些试验方法包括但不限于以下典型防护装置: 1.2.1 导线防护罩和连接盖如下 : 1.2.1.1线路防护装置， 1.2.1.2线路保护连接器， 1.2.1.3绝缘子盖， 1.2.1.4死端盖， 1.2.1.5总线防护装置，以及 1.2.1.6总线 “ T ” 警卫。 1.2.2 结构和设备包括以下内容 : 1.2.2.1电杆防护装置， 1.2.2.2脊销盖， 1.2.2.3开关叶片盖， 1.2.2.4护臂， 1.2.2.5开口盖， 1.2.2.6结构屏障，以及 1.2.2.7横臂防护装置。 1.3本设备的用户通常会编写正确使用和维护说明。 1.4本设备的使用和维护不在本试验方法的范围内。 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和健康实践，并确定监管限制的适用性。 1.6以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 ====意义和用途====== 所有三种测试均可用于产品设计鉴定。 本规范涵盖制造商指定的最低电气、化学和物理性能，以及确定此类性能的详细程序。买方可以选择执行或已经执行任何此类测试，并可能拒收不符合标准的设备。有关不符合规范的索赔应由制造商验证。 塑料防护设备用于防止工人意外接触电刷。 应在使用它们的最大电压和测试它们的验证测试电压之间提供安全裕度。这种关系如表1和表2所示。该设备仅设计用于相对地或覆盖相对覆盖相暴露。 笔记 1-橡胶绝缘设备实际上仅限于设计规范标准中的4级材料。塑料防护设备的设计可超过这些电压，并提供满意程度的工人保护。橡胶和塑料防护设备的使用标准存在重大差异。 橡胶绝缘设备的每个手套、套筒或其他物品都有一个给定的安全系数，用于其可能使用的相间电压以及其测试的等级或验证电压。然而，塑料防护设备的设计仅当用于相对地面暴露时，才能提供令人满意的安全系数。如果暴露是相间的，则只有当暴露是相间的时，才提供令人满意的安全系数。 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，除本规范因设计限制而规定的限制外，本设备的使用和维护不在本规范范围内。 通常情况下，此类防护设备的用户有责任制定完整的说明和法规，详细管理此类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 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 and health practices and determine the applicability of regulatory limitations prior to use. 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. ====== Significance And Use ====== All three tests may be used for product design qualification. 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. 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. 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. 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.