Transformer Secondary Conductors
Feb 1, 2008, By Mike Holt, NEC Consultant
Similar to feeder taps, covered in the last issue, transformer secondary conductors can be every bit as confusing. Let's take a closer look at 240.21(C)...
The Art and Science of Color Coding
Feb 1, 2008, By David Herres, Master Electrician
On any given project, choosing the appropriate colors for conductors during installation facilitates maintenance and enhances troubleshooting efforts...
Optimizing Energy Conservation in Today's Plants
Feb 1, 2008, By Dave Bovankovich, E-Mon, LLC
With the industrial sector consuming more than one-third of all the energy used in the United States, it's easy to see why facility managers are constantly...
Motor Selection for Adjustable-Speed Drives
Feb 1, 2008, By Alexander Kusko, Sc.D., P.E., Exponent Failure Analysis Associates, and Jean Y. Ayoub, M.S.E.E.,
Prior to the advent of the adjustable-speed drive (ASD), the polyphase induction motor operated as a constant-speed motor. Figure 1 shows the well-known...
AFCI Article Sparks Reader Debate
Jan 1, 2008,
Your magazine is very informative. I would like to comment on the article by Gerald Winstanley from NEMA, starting on page C34 of the November 2007 issue....
Once an Engineer, Always an Engineer
Jan 1, 2008, By Michael Eby, Editor-in-Chief
By the time this issue hits your inbox, Engineers Week, celebrated around the world from February 17 to 23, will be less than a month away. Although I'm...
Free Guides to Ampacity Adjustments for Wire and Cable Derating
Jan 1, 2008,
Did you know that conduits on the rooftops of commercial buildings can run more than 70F hotter than surrounding temperatures? For example, depending...
Analyze This
Jan 1, 2008,
Standby Power Stats at a Glance What do microwave ovens, garage door openers, and cable boxes have in common? They are just a few of the appliances found...
Increase Your Motor System's Efficiency
Jan 1, 2008,
Although electric motors consume more electricity than any other technology in industrial and commercial applications, today's energy-efficient and premium-efficiency...
Speed Control of Motors
Jan 1, 2008, By Steve Vidal, P.E., Joseph J. Vidal & Sons, Inc.
Speed, torque, and horsepower are three inter-related parameters in motor control. The speed of a motor, measured in revolutions per minute (rpm), defines...
The Changing Shape of Renewables Technology
Jan 1, 2008, By Beck Ireland, Staff Writer
Until recently, breakthroughs in renewable electric energy technology debuted in relative obscurity. With high up-front costs and rates of return spanning...
AC-DC Data Center Debate Heats Up
Jan 1, 2008, By Tom Zind, Freelance Writer
The candidates exude power, supporters are campaigning hard, the issues are framed as vital, and the outcome is ultimately uncertain. That's the 2008...
Mortgage Fallout
Dec 1, 2007, By Beck Ireland, Staff Writer
Over the past two years, the seesaw that is the construction industry economy was kept level by a thriving non-residential sector. Industry analysis performed...
Searching for Gold in Green Buildings
Dec 1, 2007, By Joe Knisley, Senior Editorial Consultant
A variety of green initiatives in the construction industry are helping to spotlight the importance of being good stewards of the environment. However,...
Bragging Rights
Dec 1, 2007, By Beck Ireland, Staff Writer
With overall construction spending in the black and double-digit increases for non-residential construction in the last few years, electrical firms have...
