CSA C22.2 NO. 156-M1987 (R2023)

1. Scope

1.1

This Standard applies to solid-state, single-phase motor speed controls, rated at 300 V and less, 20 A and less, designed to be used in circuits for the control of shaded pole, permanent split capacitor, or universal motors, and other motors suitable for use with this type of control, intended for use in nonhazardous locations in accordance with the Canadian Electrical Code, Part I.

1.2

This Standard applies to controls that may incorporate a switch t o place an air gap in series with the motor; and when provided with a series switch, (a) incorporate solid-state components in a phase shift network to provide a controlled voltage output and designed so that (i) Type I: the ON/OFF function is independent of the output voltage setting; or (ii) Type II: the ON/OFF function can be operated at minimum output voltage setting only; or (iii) Type III: the ON/OFF function can be operated at maximum output voltage setting only; or (b) (Type IV) incorporate solid-state components to provide one or more, but not an infinite number of positions of control.

1.3

This Standard applies to controls intended for (a) flush mounting; (b) surface mounting; (c) use as a table-mounted control to which a portable motor can be temporarily connected; (d) installation in other equipment as part of the control package for that equipment; (e) permanent installation in the supply line of a motor; or (f) other similar applications within the general outline above.

1.4

This Standard does not apply to resistor, transformer, and variable frequency type motor speed controls.