序言这是CSA C22的第二版。2个204，线路隔离监测器。它是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1984年出版的前一版。本版本的变更包括a）增加了符合CAN/CSA-C22的要求。0号2个；b） 将最大总危险指数的限值从2 mA提高到5 mA；c） 降低监测器危险指数rms值的公差；d） 明确视觉指标；e） 将CSA集团其他标准涵盖的条款替换为对这些标准的引用； 和f）更新第2条中列出的参考标准。范围1。1本标准适用于根据《加拿大电气规范》第一部分的规定，作为不超过300 V的单相隔离（不接地）配电系统的辅助部分安装和使用的线路隔离监测器，包括特别适用于麻醉场所和医院及其他医疗机构的其他患者护理区域的任何规则。1.2本标准适用于所有线路隔离监测器，并包括其安装外壳的要求。 1.3本标准适用于被编程为定期或连续测量单相电源和任何连接负载的每个“侧”对地阻抗，并在其中一个或两个阻抗等于或小于预设限值时激活警报的监测器。1.4本标准适用于远程指示器，其设计用于复制线路隔离监测器显示的部分或全部报警指示。1.5本标准不包括危险场所安装监测器的要求，因为《加拿大电气规范》第一部分没有规定在此类场所安装监测器。 1.6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；“应该”用于表示建议或建议但不需要的建议；“可”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；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。 附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

PrefaceThis is the second edition of CSA C22.2 No. 204, Line isolation monitors. It is one of a series of Standards issued by CSA Group under Part II of the Canadian Electrical Code. It supersedes the previous edition published in 1984. The changes to this edition include a) adding the requirement to comply with CAN/CSA-C22.2 No. 0; b) increasing the limit for maximum total hazardous index from 2 mA to 5 mA; c) reducing in the tolerance for the rms value of the monitor hazard index; d) clarifying the visual indicator; e) replacing clauses that are now covered by other CSA Group standards with references to those standards; and f) updating the referenced standards listed in Clause 2.Scope1.1 This Standard applies to line isolation monitors designed to be installed and used as an ancillary part of a single-phase isolated (ungrounded) power distribution system not exceeding 300 V in accordance with the rules of the Canadian Electrical Code, Part I, including any rules that are applicable particularly to anaesthetizing locations and other patient care areas in hospitals and other health care facilities. 1.2 This Standard applies to all line isolation monitors and includes requirements for the enclosure in which they are mounted for installation. 1.3 This Standard applies to monitors of a kind that are programmed to measure, periodically or continuously, an impedance to ground of each "side" of a single-phase power supply and any connected load and to activate an alarm whenever either or both of these impedances are equal to or less than a preset limit. 1.4 This Standard applies to remote indicators designed to duplicate some or all of the alarm indications that are presented by a line isolation monitor. 1.5 This Standard does not include requirements for monitors for installations in hazardous locations, as Canadian Electrical Code, Part I does not provide for their installation in such locations. 1.6 In 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.