C22.2 NO. 77-95 (R2013)
Motors with Inherent Overheating Protection
This Standard applies to ac and dc motors with inherent overheating protection
designed to be used in accordance with the Canadian Electrical Code, Part 1, as
(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
This standard does not apply to sealed (hermetic) type motor compressors with
inherent overheating protection (See CSA Standard C22.2 No. 140.2).
A product that contains features, characteristics, components, materials, or
systems new or different from those in use when the Standard was developed, and
that involves a risk of fire, electric shock, or injury to persons, shall be
evaluated using the appropriate additional component and end-product
requirements as determined necessary to maintain the level of safety for the
user of the product as originally anticipated by the intent of this Standard.