CSA C22.2 NO. 338:19

Scope

1.1 This Standard applies to wiring devices rated 60 A or less and intended for use in accordance with CSA C22.1, Canadian Electrical Code, Part I, as follows:
a) Class 2 power supply outlets (USB) installed on
i) faceplates of an outlet box;
ii) a yoke similar to an outlet box mounted receptacle; or
iii) mounted on a wall as a self-contained device; and
b) combination devices (receptacle/USB, general use switch/USB).

1.2 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.

1.3 The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.