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CSA C22.2 NO 55 4th Edition, January 1, 2015
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Special use switches
Published By:CSA Group (CSA)
Page Count:37
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CSA B51
This Standard applies to manually operated and mechanically operated special use switches that are

a) for use on dc, ac/dc, or ac only; and

b) rated at not more than

i) 60 A at 250 V or less; or

ii) 30 A or 2 hp at 600 V or less

and intended for use in accordance with the Canadian Electrical Code, Part I.

This Standard does not apply to

a) 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; and

h) solid state lighting controls covered in CSA C22.2 No. 184.

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.