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UL Standards Update: January 1-15, 2011

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 98: Enclosed and Dead-Front Switches
Revision dated January 14, 2011

UL 399: Standard for Drinking-Water Coolers
Revision dated January 14, 2011

- 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 464: Standard for Audible Signal Appliances
Revision dated January 12, 2011

UL 778: Standard for Motor-Operated Water Pumps
Revision dated January 14, 2011

UL 864: Standard for Control Units and Accessories for Fire Alarm Systems
Revision dated January 12, 2011

UL 1090: Standard for Electric Snow Movers
Revision dated January 14, 2011

UL 1286: Standard for Office Furnishings
Revision dated January 6, 2011

- From Our Sponsors -

UL 2267: Standard for Fuel Cell Power Systems for Installation in Industrial Electric Trucks
Revision dated January 13, 2011

 

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