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UL 347

UL Standard for Safety Medium-Voltage AC Contactors, Controllers, and Control Centers

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Organization: UL
Publication Date: 29 January 2016
Status: active
Page Count: 133
scope:

Scope and object

This standard is applicable to ac contactors applied at voltages in the range of 1 501V to 15kV, and metal-enclosed contactor-based controllers, control centers, and other control assemblies and associated equipment applied at voltages in the range of 751V to 15kV, designed for operation at frequencies of 50 or 60 Hz on three-phase systems. These requirements cover equipment intended for use in ordinary (non-hazardous) locations and installed in accordance with the applicable local installation codes and standards (see Annex A, Item 1). These requirements, as modified by the applicable national standards for fire pump controllers, also cover fire pump controllers (see Annex A, Item 2).

This standard also includes requirements for controllers intended for service entrance applications. (See 5.204 and Annex A, Item 3.)

This standard does not cover:

a) equipment for use in classified (hazardous) locations as defined in the applicable installation codes or standards;

b) components contained in contactors and contactor-based controllers for which individual component standards exist; and

c) auxiliary low voltage control assemblies (see Annex A, Item 4).

This standard also includes requirements for reduced-voltage solid state controllers. It does not, however, cover equipment consisting solely of electronic or solid state devices, circuits, or systems, nor does it cover electronic variable speed motor controllers (power conversion equipment). This standard does not cover full-voltage controllers using only solid state devices in the main circuit.

Document History

UL 347
January 29, 2016
UL Standard for Safety Medium-Voltage AC Contactors, Controllers, and Control Centers
Scope and object This standard is applicable to ac contactors applied at voltages in the range of 1 501V to 15kV, and metal-enclosed contactor-based controllers, control centers, and other control...
November 10, 2009
UL Standard for Safety Medium-Voltage AC Contactors, Controllers, and Control Centers
Scope and object This standard is applicable to ac contactors with rated voltages of 1 501 to 7 200 V, and metal-enclosed contactor-based controllers, control centers, and other control assemblies...
August 31, 1993
UL Standard for Safety High Voltage Industrial Control Equipment
A description is not available for this item.
347
August 31, 1993
UL Standard for Safety High Voltage Industrial Control Equipment
A description is not available for this item.
August 31, 1993
UL Standard for Safety High Voltage Industrial Control Equipment
These requirements cover enclosed industrial control equipment and associated components intended for starting, stopping, regulating, controlling, or protecting electric motors or other electrical...

References

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