1.1 本规范涵盖两（2）种电气系统绝缘监测装置。 1.1.1 I型是一种交流装置，用作永久安装装置，用于检测高达1000 VAC的有源交流不接地电气系统中对地的欧姆绝缘故障，直流元件高达1500 VDC。 1.1.2 II型直流装置是一种永久安装装置，用于检测高达1500 VDC的直流不接地电气系统中对地的欧姆绝缘故障。 1.2 限制- 本规范不包括拟在无直流元件的交流不接地系统中运行的设备。 1.3 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.4 以下预防性警告仅适用于试验方法部分第节 7. 本规范: 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、健康和环境实践，并确定监管限制的适用性。 1.5 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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers two (2) types of electrical system insulation monitoring devices. 1.1.1 Type I is an AC device intended as a permanently installed unit for use in the detection of ohmic insulation faults to ground in active AC ungrounded electrical systems up to 1000 VAC, having DC components up to 1500 VDC. 1.1.2 Type II is a DC device intended as a permanently installed unit for use in the detection of ohmic insulation faults to ground in DC ungrounded electrical systems up to 1500 VDC. 1.2 Limitations— This specification does not cover devices that are intended for operation in AC ungrounded systems without DC components. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are included for information only and are not considered standard. 1.4 The following precautionary caveat pertains only to the test methods portion, Section 7 of this specification: 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. 1.5 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.