UL 20:2000 pdf download General-Use Snap Switches
1.10 For switches intended for connection to branch-circuit wiring containing aluminum conductors, referto the Standard for Receptacles and Switches intended for Use with Aluminum Wire, UL 1567, or toAppendix B.
2 Definitions
2.1 The following definitions apply in this Standard:
Clearances – through-air spacing.
Creepage distances (creepage) – over-surface spacings
Door Switch – a single-pole, momentary contact switch with a push-button actuator, provided with anoutlet-box and cover. lt is intended for installation in door jambs to control lighting fixtures, typically in acloset.
Fixture switch – a switch installed in the enclosure of a fixture such as a luminaire, a fan or the like
Flush switch – a switch provided with a mounting yoke or integral flush device cover plate andintended for installation in or on an outlet box intended to control a branch circuit.
Pendant switch – a switch intended to be installed at the end of a flexible cord for use in branch-circuitpendant applications.
Self-contained switch – a switch intended for flush mounting without a separate outlet box forconnection to one or more nonmetallic sheathed cables containing copper conductors.
Surface switch – a switch provided with a separable base and cover primarily intended for branchcircuit installation on exposed wiring consisting of open wiring on insulators or nonmetalic sheathedcable.
Terminal, insulation displacement – a terminal having a contacting member that forces the conductoinsulation aside and presses against the side of the conductor to make contact.
Terminal, pin-type – a terminal having a contact pin that punctures the conductor insulation to contactthe current-carrying conductor.
Terminal, pressure-wire – a terminal where the conductor is clamped under a pressure plate or saddleby one or more screws or nuts.
Terminal, push-in a terminal where the stripped end of a conductor is pushed into the terminal and theclamping pressure is maintained by a spring mechanism, without the use of screws.
Terminal, set-screw – a terminal where the clamping pressure is applied by the end of the screwbearing directly on the conductor.
Terminal, wire-binding screw – a terminal in which the conductor is bent around the screw and isclamped directly under the head of the screw when it is tightened.
Through-cord switch a switch intended to be installed along the length of flexible cord such as for usein power-supply cords or cord sets.
3 General
3.1 New Product Evaluation
3.1 .1 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this Standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of this Standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this Standard cannot be judged to comply with this Standard. Where considered appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.
UL 20:2000 pdf download
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