Gives the requirements and testing of electronic control equipment, a general term covering electronic switches, HBES/BACS switches and electronic expansion units. It is suitable for electronic switches and HBES/BACS switches. It is only suitable for alternating current (AC) with a rated switching voltage of not more than 250 V and a rated current of not more than 16 A. It is used for indoor or outdoor household and similar fixed electrical installations. It is also suitable for electronic expansion units with rated supply voltages not exceeding 250 V AC and 120 V DC.IEC 60669 This part of is also applicable to electronic control equipment that includes integrated radio receivers and transmitters.