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UL 20 Document Information:
Title
UL Standard for Safety General-Use Snap Switches
Underwriters Laboratories Inc.
Publication Date:
Sep 22, 2000
Scope:
The requirements of this Standard apply to manually operated,
general-use snap switches for connection to copper (Cu) or
copper-clad conductors used in accordance with the National
Electrical Code(NEC), ANSI/NFPA 70, or the Canadian Electrical Code
(CEC), Part 1, and intended for connection to wiring systems
recognized by the NEC or the CEC, Part 1. In Canada, requirements
for switches for connection to aluminum (Al) conductors used in
accordance with the CEC, Part 1, and intended for connection to
wiring systems recognized by the CEC, Part 1, are covered in
Appendix B.
This Standard applies to ac/dc rated switches for which the load
ratings do not exceed 60 A at 250 V or less, 30 A at 251 V – 600 V,
and 2 hp at 125 V – 600 V or less. This Standard also covers
ac-only rated switches for which the load ratings do not exceed 30
A at 347 Vac or less.
This Standard applies to switches constructed to be installed
readily in a flush device box or on an outlet-box cover and
intended for connection to branch-circuit wiring.
This Standard applies to pendant and through-cord switches
intended for field installation on flexible cord and provided with
one "on" and one "off" position.
This Standard applies to switches intended for surface mounting
and provided with a separable base and cover for connection to
exposed wiring consisting of nonmetallic sheathed cable or open
wiring on insulators (knob and tube).
This Standard applies to self-contained switches intended for
flush mounting without a separate outlet box and for connection to
branch-circuit wiring consisting of one or more non-metallic
sheathed cables containing copper conductors.
This Standard applies to ac/dc fixture switches intended to be
installed in fixtures to control incandescent lighting or fans for
connection to branch-circuit wiring.
This Standard also applies to single-pole, momentary-contact
door switches constructed to be installed readily in a
special-purpose device box or on an outlet-box cover for connection
to branch-circuit wiring.
This Standard does not apply to:
Clock operated switches specified in the Standard for
Clock-Operated Switches, UL 917, and CSA Standard C22.2 No.
177;
Dimmer switches specified in the Standard for Solid-State
Dimming Controls, UL 1472, and CSA Standard C22.2 No. 184.1;
Industrial control equipment specified in the Standard for
Industrial Control Equipment, UL 508, and CSA Standard C22.2 No.
14;
Solid-state, single-phase motor speed controls specified in the
Standard for Solid-State Fan Speed Controls, UL 1917, and CSA
Standard C22.2 No. 156;
Special-use and ac-only fixture switches specified in the
Standard for Special-Use Switches, UL 1054, and CSA Standard C22.2
No. 55; and
Switches for use in hazardous locations specified in the
Standard for Switches for Use in Hazardous (Classified) Locations,
UL 894, and CSA Standard C22.2 No. 159.
For switches intended for connection to branch-circuit wiring
containing aluminum conductors, refer to the Standard for
Receptacles and Switches Intended for Use with Aluminum Wire, UL
1567, or to Appendix B.
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