UL 1054:2013 free download

UL 1054:2013 free download Special-Use Switches
3 components
3.1 A component of a product covered by this standard shall comply with the requirements for thatcomponent,and shall be used in accordance with its recognized rating and other limitations of use.Acomponent need not comply with a specific requirement that:
a) Involves a feature or characteristic not needed in the application of the component in theswitches covered by this standard; or
b) ls superseded by a requirement in this standard.
3.2 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
3.3 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.
3.4 ln the following text, a requirement that applies only to a switch for a specific use, such as in a heatingappliance or in a radio or television-receiving appliance, is so identified by a specific reference in thatrequirement to the use involved. Absence of such specific reference or use of the term switch indicatesthat the requirement applies to all switches covered by this standard unless the context indicatesotherwise.
4General Requirements for All Switches
4.1 Requirements under this heading apply to all switches covered by this standard. They aresupplemented in subsequent sections with requirements applying exclusively to heater switches,television switches, and special-use dimmer switches.
4.2 A switch shall employ materials that are acceptable for the intended use.cONSTRUCTION
5 Enclosure
5.1 General
5.1.1 A metal enclosure of a switch (such as the shell of a pendant-type switch) shall not be less than0.013 in (0.33 mm) thick. Thicker metal shall be employed to provide strength and rigidity if the size orshape of the enclosure requires an increased metal thickness.
5.1.2 A switch intended to be exposed to a specific environment shall comply with the applicablerequirements in the Standard for Enclosures for Electrical Equipment, UL 50.
5.2 Lining
5.2.1 All conductive material on the inside surface of a part of the enclosure that is removable for wiringshall be lined completely with insulation not less than 1/32 in (0.8 mm) thick. The thickness of theinsulation is to be measured by means of a machinist’s micrometer caliper having a flat-ended spindle anda rounded anvil.
Exception: The lining of a switch may be less than 1/32 in (0.8 mm) thick if of a material – other thanpaper or fiber – that has been shown to be acceptable for the application, and may be omitted if there isa spacing of not less than 1/4 in (6.4 mm) between any uninsulated live part and the metal enclosure.
5.2.2 An insulating lining shall be secured so that it will remain in place under conditions of ordinaryservice and prevent the enclosure from becoming a live part even if a wire inside the switch shouldbecome loose or detached from its position.
6 Thermoplastic Materials
6.1 A thermoplastic material used in a switch shall comply with the requirements in Table 6.1.
Exception: A thermoplastic material with a flammability Class of less than V-2 as required in Table 6.1used in a switch with material that complies with the applicable 3/4-in flame test specified in the Standardfor Polymeric Materials – Use in Electrical Equipment Evaluations,UL 746C, complies with therequirement.