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UL 1066 Document Information:
Title
UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures
Underwriters Laboratories Inc.
Publication Date:
May 30, 1997
Scope:
These requirements cover low-voltage ac power circuit breakers
as follows:
a) Stationary-mounted or drawout-mounted types,
b) 2-pole and 3-pole constructions,
c) Manually operated or power operated, and
d) With or without electromechanical or solid-state type trip
device.
These requirements apply to drawout-mounted type low-voltage ac
integrally fused power circuit breakers, consisting of low-voltage
ac power circuit breakers with integral current limiters or
fuses.
These requirements apply to low-voltage ac fuse draw-outs
consisting of current limiters or fuses in a drawout assembly
intended to be connected in series with a low-voltage ac power
circuit breaker to form a fused circuit breaker.
These requirements apply to general purpose type low-voltage dc
power circuit breakers.
These requirements cover equipment intended for use in ordinary
locations in accordance with the National Electrical Code,
ANSI/NFPA 70.
These requirements are intended to supplement and be used in
conjunction with the:
a) Standard for Low-Voltage AC Power Circuit Breakers Used In
Enclosures, ANSI/IEEE C37.13-1990,
b) Standard for Low-Voltage DC Power Circuit Breakers Used In
Enclosures, ANSI/IEEE C37.14-1993,
c) Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker
Switchgear, ANSI/IEEE C37.20.1-1993,
d) Test Procedures for Low-Voltage AC Power Circuit Breakers
Used In Enclosures, ANSI C37.50-1989 (R1995), and
e) Conformance Testing of Metal-Enclosed Low-Voltage AC Power
Circuit Breaker Switchgear Assemblies, ANSI C37.51-1989
(R1995).
These requirements cover equipment rated 600 V or less nominal,
635 V maximum ac and 300 V maximum dc.
This Standard does not apply to molded-case circuit
breakers.
These circuit breakers are intended for installation in circuit
breaker enclosures, switchboards (switchgear), panelboards, and the
like. Drawout-mounted devices are intended for use with specific
adapters or receiving equipment. The acceptability of the
combination of a circuit breaker with respect to any overall
enclosure will be determined when the complete product is
considered.
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.
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