前言:这是CSA C22.2 No.160电压和极性测试仪的第三版，是CSA集团根据《加拿大电气规范》第二部分发布的一系列标准之一。它取代了1985年和1983年出版的先前版本。与前一版相比的主要变化包括:a）更新了聚合物材料性能评估的要求；b） 增加了防腐要求；所有参考标准均已更新。范围:1.1本标准适用于在非危险场所使用的电压和极性测试仪，符合《加拿大电气规范》第一部分关于电压差不超过750 V的点的供电电路和设备的规则。1.2本标准不适用于主要用于测量电压的装置，如采用电表移动的装置。 1.3本标准不适用于专门设计用于电力或通信公用设施行使其公用设施功能的设备。1.4在本标准中，“应”用于表示要求，即用户为遵守本标准而有义务满足的规定；“宜”用于表示建议或建议但不需要的建议；“may”用于表示一个选项或在标准范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释旨在与文本中的解释性或信息性材料分开。表和图的注释被视为表或图的一部分，可以作为要求编写。 附录被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

Preface:This is the third edition of CSA C22.2 No. 160,Voltage and polarity testers, one of a series of Standards issued by CSA Group under Part II of theCanadian Electrical Code. It supersedes the previous editions published in 1985 and 1983.Major changes from the previous edition include the following:a) requirements for the evaluation of properties of polymeric materials have been updated;b) corrosion protection requirements have been added; andc) all of the reference standards have been updated.Scope:1.1This Standard applies to voltage and polarity testers for use in nonhazardous locations, in accordance with the Rules of theCanadian Electrical Code, Part I, on electrical supply circuits and equipment at points where the voltage difference does not exceed 750 V.1.2This Standard does not apply to devices primarily intended to measure voltage, such as those that employ a meter movement.1.3This Standard does not apply to devices designed specifically for use by an electric or communication utility in the exercise of its function as a utility.1.4In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.