UL 497
UL 497
UL 497 Series of Safety Standards
The UL 497 series is a family of three safety standards that provides requirements for
protection devices used in low-voltage circuits.
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UL 497 addresses requirements for primary protectors used in paired communications
circuits.
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UL 497A covers secondary protectors for use in single or multiple pair-type
communications circuits.
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UL 497B addresses protectors used in data communication and fire alarm circuits.
UL 497C addresses protectors for coaxial circuits.
The focus of UL 497 is to ensure that paired communication circuit protectors do not
become a fire or safety hazard. The requirements in UL 497 cover any protector that is
designed for paired communications circuits and is employed in accordance with Article 800
of the National Electric Code. The protectors covered in UL 497 include solid state primary
and station protectors. These circuit protectors are intended to protect equipment, wiring,
and service personnel against the effects of excessive voltage potential and currents in the
telephone lines caused by lightning, power cross, power induction, and rises in Ground
potential.
UL 497 Construction and Performance Requirements
The “Construction” section covers the following requirements:
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General
Enclosures
Protection Against Corrosion
Field-wiring Connections
Components
Spacing
The “Performance” section covers the following requirements:
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General
Line Fuse Test
Instrument Fuse Test
Arrestor Test
Polymeric Material Test
Rubber Materials Test
Corrosion Test, Outdoor Use Protector
Jarring Test
Water Spray Test
Drop Test
Cover Replacement Test
Strain Relief Test
Replacement Arrestors Installation Test
Appliqué Assemblies Installation Test
Dielectric Voltage-withstand Test
Manufacturing and Production Tests
Marking
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SIDACtor Data Book and Design Guide
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