UL 988-2020 pdf free download.Humidifiers.
2,8 HUMIDIFIER — Equipment that is designed to increase the relative humidity of air.
2.9 JUNCTION BLOCK — A wiring device that encloses splices between wires and that may provide a receptacle for connecting a component of the equipment.
2.10 PORTABLE EQUIPMENT — Equipment designed to not be used in a fixed position and that receives current through a flexible cord or cable and an attachment plug.
2.11 SAFETY-CIRCUIT— A circuit that includes contacts of any controls integral with, or external to, the equipment that are intended to prevent unsafe operation of the equipment due to circuit wiring becoming grounded, open circuited, or short circuited, such as:
a) A device to prevent overheating of a motor due to overload (induding locked rotor):
b) A temperature limit switch, the failure of which to operate might result in an unsafe operation; or
c) A pressure-limiting device in a system. the failure of which to operate might result in an unsafe condition.
2,12 TEMPERATURE-LIMITING THERMOSTAT — A thermostat that functions only under conditions that produce abnormal temperatures. The failure of such a thermostat might result in a hazard.
2.13 TEMPERATURE-REGULATING THERMOSTAT – A thermostat that functions only to regulate the temperature under normal conditions of use. The failure of such a thermostat would not result in a hazard.
2.14 USER SERVICING — Any form of servicing that is likely to be performed by personnel other than those who are trained to maintain the product. Some examples include routine cleaning, filter replacement. and replacement of an accessible fuse or lamp.
3 General
3.1 Components
3.1 .1 Except as indicated in Clause 3.1.2, a component of a product covered by this Standard shall comply with the requirements for that component. See Annex A for a list of Standards covering components used in the products covered by this Standard. A component shall comply with the CSA and UL Standards.
3.1.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this Standard; or
b) Is superseded by a requirement in this Standard.
3.1.3 A component shall be used in accordance with its rating established for the intended conditions of use.UL 988 pdf download.