前言:这是CSA标准C22的第二版。2号144（现为CAN/CSA-C22.2号144-M91），加拿大标准协会根据《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1977年出版的前一版。它已被转换为国际单位制（公制）。范围:1.1根据CSA标准C22，本标准适用于安装在标称系统电压为600 V及以下的非危险场所的接地故障断路器（GFCI）。1，加拿大电气规范第一部分，用于自动切断电气装置的某些部分。1.2本标准包括A级GFCI的规定，CSA标准C22的规则中规定了使用此类GFCI进行电击防护。1、加拿大电气规范第I.1.3部分本标准也适用于除A类以外的GFCI。1.4本标准包括对断路器功能、结构和性能的最低要求。

Preface:This is the second edition of CSA Standard C22.2 No. 144 (now CAN/CSA-C22.2 No. 144-M91), one of a series of Standards issued by Canadian Standards Association under Part II of theCanadian Electrical Code. It supersedes the previous edition published in 1977. It has been converted to SI (metric) units.Scope:1.1This Standard applies to ground fault circuit interrupters (GFCIs) intended for installation in non-hazardous locations at nominal system voltages of 600 V and less, in accordance with CSA Standard C22.1,Canadian Electrical Code, Part I, in order to automatically de-energize some part of an electrical installation.1.2This Standard includes provisions for Class A GFCIs, the use of which for protection from electric shock is specified in the Rules of CSA Standard C22.1,Canadian Electrical Code, Part I.1.3This Standard applies also to GFCIs other than Class A.1.4This Standard includes minimum requirements for the function, construction and performance of interrupters.