scope:

Requirements contained in this Standard cover controls of the light-sensitive or presence-sensitive types, or both; for indoor or outdoor service; intended for the control of indoor or outdoor loads up to a maximum of 20 A and maximum 347 V; intended for installations on 50 Hz or 60 HZ systems or DC up to 60 V (for US); and DC up to 42.4 V (for Canada); and intended to be installed in accordance with the National Electrical Code (NEC), NFPA 70, the Canadian Electrical Code (CE Code) Part I, CSA C22.2 No. 0, and NOM 001 SEDE.

These requirements do not cover controls intended to be used under the following conditions:

a) Devices that are locking type, used for area or roadway lighting fixtures;

b) Devices that monitor or control safety critical loads or personal protection circuits;

c) Devices intended to be installed in areas designated hazardous locations;

d) Devices intended to be installed for manufacturing process control.