UL 1066:2017

$78.65

Standard for Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures

Published By	Publication Date	Number of Pages
UL	2017-03-22	35

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Category: UL

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Description

1 Scope

1.1 These requirements cover low-voltage ac power circuit breakers as follows:

a)    Stationary-mounted or drawout-mounted types,

b)    2-pole, 3-pole, and 4-pole constructions,

c)    Manually operated or power operated, and

d)    With or without electromechanical or solid-state type trip device.

1.1 revised effective April 13, 2017

1.2 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.

1.2 revised effective April 13, 2017

1.3 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.

1.3 revised effective April 13, 2017

1.4 These requirements apply to general purpose type low-voltage dc power circuit breakers.

1.4 revised effective April 13, 2017

1.5 These requirements cover equipment intended for use in ordinary locations in accordance with the National Electrical Code, ANSI/NFPA 70.

1.5 revised effective April 13, 2017

1.6 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, IEEE C37.13,

b)    Standard for Low-Voltage DC Power Circuit Breakers Used In Enclosures, IEEE C37.14,

c)    Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear, IEEE C37.20.1,

d)    Test Procedures for Switchgear – Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI C37.50, and

e)    Conformance Test Procedures for Switchgear – Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies, ANSI C37.51.

1.6 revised effective April 13, 2017

1.7 These requirements cover equipment rated 1000 V or less nominal, 1058 V maximum ac and 1500 V maximum dc.

1.8 This Standard does not apply to molded-case circuit breakers.

1.8 revised effective April 13, 2017

1.9 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.

1.9 revised effective April 13, 2017

Additional information