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)...
Warehouse Retrofit Saves More Than Electricity
Feb 1, 2008, By Stefanie Kure, Senior Associate Editor
With a student population of approximately 25,000, Colorado State University (CSU), Fort Collins, Colo., is dedicated to reducing its impact on the environment....
Under Contract
Feb 1, 2008, By Beck Ireland, Staff Writer
In 2005, Kentucky procured a statewide LED traffic signal retrofit. Not only did this project make it the second state after Delaware to use LED modules...
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...
OSHA Announces New National Emphasis Program on Silica
Feb 1, 2008,
Each year, approximately 2 million American employees are exposed to crystalline silica, a hazardous form of dust. According to the Center to Protect...
Product News
Feb 1, 2008,
Double-conversion UPS The Digital Energy LP-33U Series double-conversion UPS with true online voltage and frequency-independent operation provides 97%...
Billings at Architecture Firms Hold Steady
Feb 1, 2008,
The American Institute of Architects (AIA), Washington, D.C., says billings at architecture firms remained steady in December, ending the year with the...
Product News
Feb 1, 2008,
Cold storage luminaires Offered with T5HO and T8 lamps, the MJF14, MJF164, and MJF24 cold storage luminaires are designed for use over a temperature range...
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...
Don't Get Burned by Not Following Protocol
Jan 1, 2008,
Proper training is an important part of any occupation, but it's especially critical to workers in the electrical profession. A journeyman electrician...
School Science Complex Has Students Seeing Green
Jan 1, 2008, By Stefanie Kure, Senior Associate Editor
When it opened its doors in 1967, the Sputnik Science Center at St. Olaf College, a private liberal arts school located in Northfield, Minn., was a state-of...
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...
The Real Role of the Contractor/Owner
Jan 1, 2008, By Jayme Dill Broudy, Contractor's Business School
You don't see Donald Trump dealing blackjack or George Steinbrenner playing third base for the Yankees. Instead, they spend their time developing solid...
Tracking Down Transient Voltages
Jan 1, 2008, By Tom Shaughnessy, PowerCET
Have you just spent another day at the office fighting with computers? Join the club. Besides viruses, malware, and software, is it possible that something...
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...
Speed Control of Motors
Jan 1, 2008, By Steve Vidal, P.E., Joseph J. Vidal & Sons, Inc.
An introduction to variable-frequency drives. Speed, torque, and horsepower are three inter-related parameters in motor control. The speed of a motor, measured in revolutions per minute (rpm), defines...
Waging the War for Talent
Jan 1, 2008, By Beck Ireland, Staff Writer
Last year, the construction industry declared a war for talent. Faced with a simultaneous increase in workload and decline in the workforce, the industry...
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...
Feeder Taps
Jan 1, 2008, By Mike Holt, NEC Consultant
Sometimes, it makes sense to tap into a feeder conductor to power another conductor. From Art. 100, we know that a feeder conductor runs between service...
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...
Short Circuits
Jan 1, 2008,
As the Trip Unraveled After finishing a job late Friday, it was time to clean up and get ready for the weekend. I placed all my tools in the toolbox,...
DOE to Invest Millions for Concentrating Solar Power
Jan 1, 2008,
The U.S. Department of Energy (DOE), Washington, D.C., recently announced plans to invest $5.2 million in funding to support the development of low-cost...
Industrial Projects to See Spending Increase in 2008
Jan 1, 2008,
Market research firm Industrial Info Resources (IIR), Sugar Land, Texas, is forecasting a 5.55% increase in total investment value (TIV) for North American...
Disposable FR Garments: What Are the Differences?
Jan 1, 2008, By Hugh Hoagland, ArcWear.com
Any petrochemical worker or electrician exposed to electric arc has something in common with a meth lab cleanup team. When they arrive on the job site,...
Lamp Demand Expected to Grow Steadily
Jan 1, 2008,
Growth in nonresidential construction and the shift to more efficient and more expensive lighting technologies will drive growth in demand for lamps at...
