本标准适用于额定电压高达132 Vac（含132 Vac）的钢或钢合金管道或设备阻抗加热系统的一般要求、测试、标记和文件要求。 这些加热系统部件旨在按照CSA C22进行安装。1，《加拿大电气规范》第一部分（CE规范）；NFPA 70，美国国家电气规范（R）（NEC（R））。；或任何其他国家电气安装规范（如适用）。本标准适用于拟安装在普通和危险场所的阻抗加热系统。危险场所的安装仅限于30 Vac，包括以下各项:在加拿大:2区；22区；或第一类第二分部；第二类第二分部；CSA C22中所述的III类，第2部分。1.在美国:一级2区；22区；或第一类第二分部；第二类第二分部；NEC中所述的III类2类。 本标准也适用于阻抗加热系统使用的电源连接点和控制方法。 注1——绝缘温度额定值高于105℃的绝缘阻抗导体的认证要求可由认证机构进行特别调查。 注2——有关变压器、配电和控制部件的信息，请参见IEEE Std 844.4/CSA 293.4。

This standard applies to general, testing, marking, and documentation requirements for impedance heating systems for steel or steel alloy pipe or equipment, rated up to and including 132 Vac. These heating system components are intended for installation in accordance with the CSA C22.1, Canadian Electrical Code, Part I (CE Code); NFPA 70, National Electrical Code(R) (NEC(R)) in the U.S.; or with any other national electrical installation code, as applicable. This standard applies to impedance heating systems intended to be installed in ordinary and hazardous locations. The hazardous location installations are limited to 30 Vac and include the following: In Canada: Zone 2; Zone 22; or Class I, Division 2; Class II, Division 2; Class III, Division 2 as described in CSA C22.1; and In the U.S.: Class I, Zone 2; Zone 22; or Class I, Division 2; Class II, Division 2; Class III, Division 2 as described in the NEC. This standard also applies to power connection points and control methods used with impedance heating systems. NOTE 1-- Requirements for certification of insulated impedance conductors with insulation temperature ratings above 105°C may be considered under a special investigation by an accredited certification body. NOTE 2-- Information on transformer, power distribution and control components can be found in IEEE Std 844.4/CSA 293.4.