CSA C22.2 NO 77
Motors with inherent overheating protection
|Publication Date:||1 January 2014|
This Standard applies to ac and dc motors with inherent overheating protection designed to be used in accordance with the Canadian Electrical Code, Part I, as follows:
a) motors with a voltage rating not exceeding 600 V and with a protective device connected in the motor circuit;
b) impedance-protected motors with a voltage rating not exceeding 600 V; and
c) motors with a voltage rating not exceeding 5000 V and having a protective device connected in an external control circuit with a voltage rating not exceeding 600 V.
This Standard applies to motors with protective devices that are responsive to
a) motor temperature alone; or
b) motor temperature and motor current passing through the device but does not apply to motors with protective devices that are responsive to current alone.
This Standard does not apply to sealed (hermetic) type motor compressors with inherent overheating protection (see CAN/CSA-C22.2 No. 140.2).
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.