UL 867-2021 pdf download – Electrostatic Air Cleaners.
3.4.2 CONTROL, OPERATING – A device or assembly of devices, the operation of which starts or regulates the end product during normal operation. For example, a thermostat, the failure of which a thermal cutout/limiter or another layer of protection would mitigate the risk of electric shock, is considered an operating control and in this example could also be called a “regulating control”. Operating controls can also include other controlling devices such as switches, contactors, relays and similar devices. Appendix B specifies control functions that are not considered to result in a risk of fire, electric shock or injury to persons. 3.4.3 CONTROL, PROTECTIVE – A device or assembly of devices, the operation of which is intended to reduce the risk of fire, electric shock or injury to persons during normal and reasonably anticipated abnormal operation of the product. For example, a thermal cutout/limiter, or any other control/circuit relied upon for normal and abnormal conditions, is considered a protective control. Protective controls are also referred to as “limiting controls” or “safety controls” and are investigated under normal and single-fault conditions. Appendix B specifies control functions that are considered to result in a risk of fire, electric shock or injury to persons. 3.4.4 ELECTRONIC COMPONENT – A part in which electrical conduction is achieved principally by electrons moving through a vacuum, gas or semiconductor. A Metal Oxide Varistor (MOV) is considered to be an electronic component, but neon indicators are not. ©IEC. This material is reproduced from IEC 60335-1 Ed. 5.2 b:2016 with permission of the American National Standards Institute (ANSI) on behalf of the International Electrotechnical Commission. All rights reserved. 3.4.5 ELECTRONIC DISCONNECTION – The de-energizing of a load within a product by an electronic device of a circuit. No electro-mechanical component having an air gap, such as a switch, contactor or relay is used to de-energize the load.