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UL Standards Update: December 16-31, 2010

Underwriters Laboratories has announced the availability of the following standards, revisions and bulletins. For additional information regarding the standards listed below, please visit their website at http://www.ul.com.

UL 496: Lampholders
Revision dated December 20, 2010

- Partner Content -

VSWR Explained

This resource traces VSWR from telegraph linemen using light bulbs to detect transmission line faults to modern RF measurements. It explains how improper line termination creates reflected signals that combine with forward waves, forming standing wave patterns. The evolution demonstrates how VSWR became a standard parameter for measuring reflected power in RF systems.

UL 959: Standard for Medium Heat Appliance Factory-Built Chimneys
New Edition dated December 17, 2010

UL 963: Standard for Sealing, Wrapping, and Marking Equipment
New Edition dated December 15, 2010

UL 1322: Standard for Fabricated Scaffold Planks and Stages
Revision dated December 17, 2010

UL 2167: Standard for Water Mist Nozzles for Fire Protection Service
Revision dated December 16, 2010

 

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