本标准适用于根据《加拿大电气规范》第一部分设计的以下产品:a）体积不超过1640 mL的非金属出线盒、导管、混凝土、地板和分线盒；b） 体积不超过1640 mL的非金属设备箱（带或不带整体配件），但多个组合箱除外，其中每个组合段的体积不超过1640 mL；和c）延长环、封闭塞和出线盒盖。本标准还适用于根据《加拿大电气规范》第一部分的规定，用于安装墙壁或天花板用金属或非金属出线盒的金属和非金属接线盒延长件的要求。见附录A。

This Standard applies to the following products designed to be employed in accordance with the Canadian Electrical Code, Part I:a) nonmetallic outlet boxes, conduit, concrete, floor, and pull boxes that do not exceed 1640 mL in volume;b) nonmetallic device boxes (with or without integral fittings) that do not exceed 1640 mL in volume, except for multiple-gang boxes where each single-gang section does not exceed 1640 mL in volume; andc) extension rings, closure plugs, and outlet box covers.This Standard also applies to requirements for metallic and nonmetallic box extenders intended for use with metallic or nonmetallic outlet boxes for wall or ceiling applications for installation in accordance with the Canadian Electrical Code, Part I. See Annex A.