前言:这是CSA C22的第一版。2号304，用于光伏应用的封闭式和死前开关，CSA集团根据《加拿大电气规范》第二部分发布的一系列标准之一。本标准拟与CAN/CSA-C22结合使用。2个4号封闭式和死前开关。本标准中的材料补充了CAN/CSA-C22。2第4条规定了用于光伏应用的开关的附加要求。有关《加拿大电气规范》第二部分标准的一般信息，请参见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本标准适用于光伏（PV）系统中使用的封闭式和死前开关，最大额定电压为1500 V dc，最大额定电流为1200 A。1.2光伏应用的可使用开关拟与CSA C22涵盖的光伏熔断器一起使用。2第248.19.1.3条适用于本标准的一般要求见最新版CAN/CSA-C22。2 No.0.1.4本标准拟与CAN/CSA-C22结合使用。2第4条，规定了额外的强制性要求。1.5在本标准中，“应”用于表示要求，即:。 e、 ，用户必须满足的条款，以符合标准；“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）- 必须）定义其应用程序。

Preface:This is the first edition of CSA C22.2 No. 304,Enclosed and dead-front switches for photovoltaic applications, one of a series of Standards issued by CSA Group under Part II of theCanadian Electrical Code.This Standard is intended to be used in conjunction with CAN/CSA-C22.2 No. 4,Enclosed and dead-front switches. The material in this Standard supplements CAN/CSA-C22.2 No. 4 by providing additional requirements for switches that are intended for use in photovoltaic applications.For general information on the Standards of the Canadian Electrical Code, Part II, see the Preface 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 enclosed and dead-front switches for use in photovoltaic (PV) systems rated 1500 V dc maximum, 1200 A maximum.1.2Fusible switches for photovoltaic applications are intended for use with photovoltaic fuses covered by CSA C22.2 No. 248.19.1.3General requirements applicable to this Standard are given in the latest edition of CAN/CSA-C22.2 No. 0.1.4This Standard is intended to be used in conjunction with CAN/CSA-C22.2 No. 4, which specifies additional mandatory requirements.1.5In 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.