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Ralph Liebing
Senior Member
Username: Rliebing

Post Number: 32
Registered: 02-2003
Posted on Thursday, August 07, 2003 - 03:33 pm:   Edit PostDelete PostPrint Post

Stray reference we have run across-- have you heard of it, and can explain it, and how it functions?

"UL Seismic Hazard Exposure Group"

Thanks for your help.
Margaret G. Chewning CSI CCS
Senior Member
Username: Presbspec

Post Number: 9
Registered: 01-2003
Posted on Thursday, August 07, 2003 - 04:33 pm:   Edit PostDelete PostPrint Post

Its a new one to me! I put the title into google and dogpile search engines and the only place it pointed was to the Global Documents Group. Checked there also and there were no UL documents in their listings with "Seismic" in the title.
You have me curious now.
Helaine K. Robinson CCS
Junior Member
Username: Hollyrob

Post Number: 3
Registered: 07-2003
Posted on Thursday, August 07, 2003 - 04:57 pm:   Edit PostDelete PostPrint Post

A visit to the UL Website produces:

UL opens network equipment-building system (NEBS) environmental facility

"The focal point of the facility's interior is the "earthquake machine" a servo-hydraulic shake table that can simulate earthquakes measuring approximately 7.0 on the Richter scale on samples weighing up to 5,000 pounds. The table is mounted to a seismic mass consisting of a 25-foot by 25-foot by 8-foot mass of concrete and steel weighing a mammoth 400 tons. The facility also contains an airborne contaminant chamber, a vibration table, an altitude chamber and two humidity/temperature chambers. The altitude chamber, for example, can simulate an altitude up to 20,000 feet above sea level with a temperature range of minus 40 degrees Celsius up to 180 degrees Celsius."

"NEBS stands for "Network Equipment-Building System." It is a term commonly used to refer to a family of documents that apply to telecommunications equipment located in a Central Office. Two of the most common documents used for testing are GR-63-CORE, Network Equipment-Building System Requirements: Physical Protection, and GR-1089-CORE, Electromagnetic Compatibility and Electrical Safety -- Generic Criteria for Network Telecommunications Equipment.

Reliability of the telephone system is considered a national security issue, is demanded by consumers and makes good business sense. Therefore, NEBS testing is taken very seriously by both the Regional Bell Operating Companies (RBOCs) and other service providers as well as manufacturers developing equipment used for the telecommunications network"


A UL Trustee:

"Eugene J. Zeller

Zeller is the Director of Planning and Building for the City of Long Beach, Calif. A graduate of University of California, Los Angeles (UCLA), Zeller has held various board positions with the National Institute of Building Sciences (NIBS), including: past chairman of the Board of Direction for the Building Seismic Safety Council and current vice chairman for the Board of Direction for the Multihazard Mitigation Council. Zeller has also served on the board of directors for the American Society for Testing and Materials (ASTM). Zeller is a resident of Hacienda Heights, Calif."
Richard Howard, AIA CSI CCS
Username: Rick_howard

Post Number: 4
Registered: 07-2003
Posted on Thursday, August 07, 2003 - 04:58 pm:   Edit PostDelete PostPrint Post

I have not heard of UL having anything to do with classification of seismic hazards.

"Seimic Exposure Hazard Group" is a term that was used in the BOCA building code (1610.1.5 in my 1997 Kentucky code). Buildings were classified into Groups I, II, and III based upon type of occupancy (criticality and the importance of survivability). Group III included essential facilities, such as hospitals, police stations, fire houses, communication centers and power generating facilities; Group II included places of public assembly; and Group I coverd all other buildings.
Ralph Liebing
Senior Member
Username: Rliebing

Post Number: 33
Registered: 02-2003
Posted on Friday, August 08, 2003 - 11:41 am:   Edit PostDelete PostPrint Post

Thanks much, Richard. Obviously a goof by a "back-then" specer!

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