Original price was: $502.00.$301.20Current price is: $301.20.
Protectors for Data Communications and Fire Alarm Circuits
standard by Underwriters Laboratories, 02/09/1999
Description
By order of the publisher, historical UL documents are not returnable for any reason. Once you place an order for an historical document, we cannot issue a refund, credit, or exchange of any kind.
Purchase of this document includes all current amendments. 3-Year subscription service also available. Reference UL 495 Subscription.
Product Details
- Edition:
- 3
- Published:
- 02/09/1999
- Number of Pages:
- 26
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
Original price was: $502.00.$301.20Current price is: $301.20.
Protectors for Data Communications and Fire Alarm Circuits
| Published by | Publication Date | Number of Pages |
| UL | 06/14/2004 | 26 |
Description
UL 497B – Protectors for Data Communications and Fire Alarm Circuits
Please note: All interim revisions for this edition available at time of your purchase will be included.
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.
Product Details
- Edition:
- 4
- Published:
- 06/14/2004
- Number of Pages:
- 26
- Note:
- This product is unavailable in Ukraine, Russia, Belarus