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Calculating Touch Voltages and Electric Shock Risk in Low-Voltage Systems

2014-04-16 18:35:59| Electrical Construction & Maintenance

By Massimo Mitolo, PhD, P.E., Eaton Corp., and Haijun Liu, PhD, P.E., ETAP The analysis of magnitudes and durations of touch voltages in cable installations can provide electrical professionals with a better understanding of the requirements of Art. 250 of the NEC regarding the protection against electric shock. read more

Tags: systems risk touch electric

Calculating your water footprint

2014-02-10 07:00:00| Climate Ark Climate Change & Global Warming Newsfeed

Environmental News Network: Water scarcity affects 2.7 billion people worldwide for at least a month each year and in the same way that each of us has a carbon footprint, Professor Arjen Hoekstra of the University of Twente in the Netherlands posits that every person also has a "water footprint". Our water footprint is calculated by counting the amount of fresh water that we each use daily and the amount of water required to produce the goods and services that we consume. Due in large part to our monthly water bill, we recognize...

Tags: water calculating footprint calculating water

Airport Screening Queues: Calculating Waiting Time at Security Control

2014-01-18 03:14:15| Wireless - Topix.net

Current security control procedures at Vrnes Airport use two infra-red thermal imaging cameras and strategically located optical sensors to provide an estimate of how long the queue will take to pass.

Tags: time control security waiting