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UL 497A

UL Standard for Safety Secondary Protectors for Communications Circuits

active, Most Current
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Organization: UL
Publication Date: 20 March 2001
Status: active
Page Count: 75
scope:

These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National Electrical Code, ANSI/NFPA 70.

Secondary protectors are intended to be used in the protected side of telecommunications networks that have an operating rms voltage to ground less than 150 volts and installed or used in accordance with the National Electrical Code, NFPA 70.

These requirements do not cover telephone protectors that are covered by the Standard for Protectors for Paired-Conductor Communications Circuits, UL 497. These requirements do not cover telephone equipment such as telephone answering devices, residential telephone instruments, telephone dialers, cordless telephones, key systems, and private-branch exchange equipment that is covered by the Standard for Information Technology Equipment - Safety - Part 1: General Requirements, UL 60950-1 or the Standard for Audio/Video, Information and Communication Technology Equipment - Part 1: Safety Requirements, UL 62368-1.

These requirements do not cover cellular telephones or other receiver/transmitter-type devices. Equipment of this type is covered by ione of the following Standards:

• Standard for Audio, Video and Similar Electronic Apparatus - Safety Requirements, UL 60065

• Standard for Information Technology Equipment - Safety - Part 1: General Requirements, UL 60950-1; or

• Standard for Audio/Video, Information and Communication Technology Equipment - Part 1: Safety Requirements, UL 62368-1.

These requirements may be used, directly or by reference, to investigate portions of other equipment not classified as telecommunications equipment accessories and that may be connected to a telecommunications network, insofar as they may be applicable to such equipment.

These requirements do not cover wires and cables intended to be permanently installed in a building in accordance with Article 800 of the National Electrical Code, NFPA 70.

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 or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the 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 does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

Document History

UL 497A
March 20, 2001
UL Standard for Safety Secondary Protectors for Communications Circuits
These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National...
March 20, 2001
UL Standard for Safety Secondary Protectors for Communication Circuits
These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National...
March 20, 2001
UL Standard for Safety Secondary Protectors for Communications Circuits
These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National...
March 20, 2001
UL Standard for Safety Secondary Protectors for Communication Circuits
A description is not available for this item.
March 20, 2001
UL Standard for Safety Secondary Protectors for Communications Circuits
These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National...
March 20, 2001
UL Standard for Safety Secondary Protectors for Communication Circuits
These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National...
March 20, 2001
UL Standard for Safety Secondary Protectors for Communication Circuits
These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National...
January 30, 1996
UL Standard for Safety Secondary Protectors for Communication Circuits
A description is not available for this item.
January 30, 1996
UL Standard for Safety Secondary Protectors for Communication Circuits
A description is not available for this item.

References

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