前言:这是CSA C22的第四版。2个55号专用开关。它取代了1986年、1957年和1942年出版的之前版本。它是根据《加拿大电气规范》第二部分发布的一系列标准之一。有关《加拿大电气规范》第二部分标准的一般信息，请参阅最新版CAN/CSA-C22的前言。2号，0号。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。 范围:1.1本标准适用于在直流、交流/直流或仅交流电源上使用的手动和机械操作的专用开关；andb）额定电压不超过i）250V或以下时为60A；orii）根据《加拿大电气规范》第一部分第1.1.2节的规定，在600V或更低电压下使用30A或2 hp，本标准不适用于构成电热器具或自动温度响应开关部件的开关；b） 开关机构内置于CSA C22覆盖的灯座中。2第43号；c） CSA C22中涵盖的通用开关。 2第111号；d） CSA C22中涵盖的固态单相电机速度控制。2第156号；e） CSA C22覆盖的调光器。2第184.1号；f） CSA C22中涵盖的时钟操作开关。2第177号；g） 用于危险场所的开关；和h）CSA C22中涵盖的固态照明控制。2本标准第184.1.3条中，“应”用于表示要求，即用户有义务满足的条款，以符合本标准；“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。

Preface:This is the fourth edition of CSA C22.2 No. 55,Special use switches. It supersedes the previous editions published in 1986, 1957, and 1942. It is one of a series of Standards issued under Part II of theCanadian Electrical Code.For general information on the Standards of theCanadian Electrical Code, Part II, see the Preface of the latest edition of CAN/CSA-C22.2 No. 0.This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.Scope:1.1This Standard applies to manually operated and mechanically operated special use switches that area) for use on dc, ac/dc, or ac only; andb) rated at not more thani) 60 A at 250 V or less; orii) 30 A or 2 hp at 600 V or lessand intended for use in accordance with theCanadian Electrical Code, Part I.1.2This Standard does not apply toa) switches forming parts either of electrothermal appliances or automatic temperature-responsive switches;b) switching mechanisms built into lampholders covered in CSA C22.2 No. 43;c) general use switches covered in CSA C22.2 No. 111;d) solid-state single-phase motor speed controls covered in CSA C22.2 No. 156;e) dimmers covered in CSA C22.2 No. 184.1;f) clock-operated switches covered in CSA C22.2 No. 177;g) switches for use in hazardous locations; andh) solid state lighting controls covered in CSA C22.2 No. 184.1.3In 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.