序言这是CSA C22的第七版。2第56号，柔性金属导管和协会液体密封柔性金属导管，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。它取代了2013年、2004年、1977年、1961年、1954年和1938年出版的之前版本。范围1。1本标准适用于贸易尺寸为12（3/8）至103（4）（不包括14（7/16））的柔性金属导管和液密柔性金属导管，用于根据加拿大电气规范第一部分安装导线的金属线槽。此外，本标准适用于贸易尺寸为10（5/16）和14（7/16）的特殊用途柔性金属导管，用于其他需要将导体封闭在柔性金属线槽中的应用。 1.2本标准涵盖的液密柔性金属导管配有一个整体热塑性护套，该护套可在最高温度60℃、75℃或105℃下使用。注:对于本标准中的导管尺寸，首先给出公制贸易代号，括号中的贸易尺寸以英寸为单位。1.3以SI（公制）单位给出的数值为标准。括号中给出的值仅供参考。1.4在本标准中，“应”用于表示要求，即用户为遵守本标准而有义务满足的规定；“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。

PrefaceThis is the seventh edition of CSA C22.2 No. 56, Flexible metal conduit and association liquid-tight flexible metal conduit, one of a series of Standards issued by CSA Group under the Canadian Electrical Code, Part II. It supersedes the previous editions published in 2013, 2004, 1977, 1961, 1954, and 1938.Scope1.1 This Standard applies to flexible metal conduit and liquid-tight flexible metal conduit, trade sizes 12 (3/8) to 103 (4), excluding 14 (7/16), intended for use as a metal raceway for the installation of conductors in accordance with the Canadian Electrical Code, Part I. In addition, this Standard applies to special purpose flexible metal conduit, trade sizes 10 (5/16) and 14 (7/16), intended for other applications requiring the conductors to be enclosed in a flexible metal raceway. 1.2 Liquid-tight flexible metal conduit covered by this Standard is provided with an overall thermoplastic jacket that is recognized for use at a maximum temperature of 60 °C, 75 °C, or 105 °C. Note: For conduit sizes in this Standard, the metric trade designator is given first, with the trade size in inches following in parentheses. 1.3 The values given in SI (metric) units are the standard. The values given in parentheses are for information only. 1.4 In 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.