前言: 这是针对接地故障电路断路器的统一ANCE、CSA集团和UL标准。它是NMX-J-520-ANCE的第三版，CSA C22的第二版。2第144.1号和UL 943第五版。本版NMX-J-520-ANCE取代了2006年2月1日发布的前一版。本版CSA C22。2 No.144.1取代了2006年2月出版的前一版。本版UL 943取代2006年2月1日发布的前一版，并于2012年6月29日修订。范围:1.1本标准适用于用于保护人员的A类单相和三相接地故障断路器，仅用于符合国家电气规范（NEC）、ANSI/NFPA 70、加拿大电气规范第一部分和电气装置（使用）NOM的接地中性点系统- 001-SEDE。这些设备适用于120 V、208Y/120 V、120/240 V、127 V或220Y/127 V、60 Hz电路的交流（AC）电路。注:在加拿大，“旨在保护人员”的文本不包括在内。1.2这些要求不包括用于绕组彼此完全绝缘的变压器供电电路的接地故障断路器。1.3本标准适用于所有A类接地故障断路器。这些A类GFCI允许集成到其他设备中，在这种情况下，除了符合本标准外，这些设备还应符合相关设备的相应适用标准。1.4本标准包括对地面功能、结构、性能和标记的最低要求- 范围内包括故障电路断路器。1.5本标准仅适用于A级GFCI设备。1.6本标准还包括拟安装在柜台上的独立式GFCI，例如适用于安装在厨房或浴室台面上的GFCI。

Preface:: This is the harmonized ANCE, CSA Group, and UL Standard for Ground-Fault Circuit-Interrupters. It is the third edition of NMX-J-520-ANCE, the second edition of CSA C22.2 No. 144.1, and the fifth edition of UL 943. This edition of NMX-J-520-ANCE supersedes the previous edition published on February 1, 2006. This edition of CSA C22.2 No. 144.1 supersedes the previous edition published in February 2006. This edition of UL 943 supersedes the previous edition published on February 1, 2006, and revised on June 29, 2012.Scope:1.1This Standard applies to Class A, single- and three-phase, ground-fault circuit-interrupters intended for protection of personnel, for use only in grounded neutral systems in accordance with theNational Electrical Code(NEC), ANSI/NFPA 70, theCanadian Electrical Code, Part I, andElectrical Installations (Use), NOM-001-SEDE. These devices are intended for use on alternating current (AC) circuits of 120 V, 208Y/120 V, 120/240 V, 127 V, or 220Y/127 V, 60 Hz circuits.Note -In Canada, the text "intended for protection of personnel" is excluded.1.2These requirements do not cover ground-fault circuit-interrupters intended for use in circuits served by a transformer having windings wholly insulated from each other.1.3This Standard applies to all Class A ground-fault circuit-interrupters. These Class A GFCIs are permitted to be integrated into other devices, in which case, besides complying with this Standard, these devices are to comply with the corresponding applicable Standard for the device in question.1.4This Standard includes minimum requirements for the function, construction, performance, and markings of ground-fault circuit-interrupters included in the scope.1.5This Standard is intended to cover only Class A GFCI devices.1.6This Standard also covers GFCIs of the self contained type that are intended for installation in a counter, such as would be suitable for installation in a kitchen or bathroom counter top.