ULSE - UL 497B
Protectors for Data Communications and Fire-Alarm Circuits
Organization: | ULSE |
Publication Date: | 14 June 2004 |
Status: | active |
scope:
00497b-000000-000000
1 Scope
1.1 These requirements cover protectors for data communications and fire-alarm circuits.
1.2 As covered by these requirements, data communications circuit protectors and fire-alarm circuit protectors consist of single- and multiple-pair air-gap arresters, gas-tube arresters, or solid-state arresters, with or without fuses or other voltage-limiting devices. Data communications circuit protectors and fire-alarm circuit protectors are intended to protect equipment, wiring, and personnel against the effects of excessive potentials and currents caused by lightning in communications alarm-initiating or alarm-indicating loop circuits.
1.3 This standard does not cover the following:
- a) Lightning protective devices for the protection of primary distribution wiring systems and equipment such as AC branch circuit protection.
- b) Antenna discharge units for radio- and television-receiving
appliances. - c) Lightning conductor and air terminals for connection of lightning rods for building protection.
- d) Protective devices to be used on telephone lines or telephone lines connecting to the telecommunication networks.
1.4 A product that contains features, characteristics, components, materials, or systems new or different from those in use when the standard was developed, 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 level of safety for the user of the product as originally anticipated by the intent of this Standard.