The power quality industry has developed certain index values that help us assess the quality of service as it relates to distortion caused by the presence...More
There's no doubt the growing demand for energy efficiency is and will continue to be a source of new business for electrical contractors. Efficiency makes...More
Fiber that bends around pencils and sharp corners without a significant increase in attenuation has captured the collective imaginations of fiber pundits...More
There's no doubt solid-state lighting (SSL) technology has progressed rapidly in recent years. Most every small research group and high-tech firm focused...More
There's no question the solar industry has reached a crossroads entering the beginning of a potentially phenomenal growth spurt that will continue for...More
Just as an NFL cornerback would face tribulation from teammates for playing wide receiver, an engineer turned contractor knows he must run the gauntlet...More
The U.S. Department of Energy (DOE), Washington, D.C, has expanded the categories of compact fluorescent lamps (CLFs) under the Energy Star label. CFL...More
Separately derived systems (SDSs) include most transformers as well as any generator or UPS supplying a transfer switch that opens the neutral conductor....More
Much like the old adage about the month in which this article appears, 2007 came roaring in like a lion for the majority of firms in EC&M's list of Top...More
President Bush recently released a $3.1 trillion budget for fiscal year 2009 that plans to shrink domestic spending and proposes a 2.9% drop in infrastructure...More
What if someone told you that you could save thousands of dollars on your next project before you even break ground? Would you believe such a grand statement?...More
Below the busy streets of downtown Oklahoma City sprawls a vast network of tunnels and bridges that links 16 blocks and more than 30 of the area's buildings....More
Although the kaleidoscope of green options available to those who design and build commercial buildings can be confusing, one fact is clear: Going green...More
There's abundant information about the sizing and application of large UPS systems; small commodity UPS systems, on the other hand, are a different story...More
When it comes to fighting climate change, many Americans are not only talking the talk, they're actually walking the walk. Case in point: the Environmental...More
Reliable operation of security systems is obviously essential to protect company assets and ensure human safety. However, episodic equipment malfunctions...More
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...More
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)...More
The energy efficiency of light-emitting diodes (LEDs) is expected to equal the most efficient white light sources by 2010, according to the U.S. Department...More
With a student population of approximately 25,000, Colorado State University (CSU), Fort Collins, Colo., is dedicated to reducing its impact on the environment....More
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...More
Although concern for the environment and awareness of green technologies are at an all-time high, results from an online survey of 1,000 respondents conducted...More
On any given project, choosing the appropriate colors for conductors during installation facilitates maintenance and enhances troubleshooting efforts...More
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....More
LEDs have unique and compelling characteristics that make them ideal for industrial lighting applications. But there are a variety of misconceptions about LEDs, how well they work, how long they last, and more. Digital Lumens developed this whitepaper to dish up the facts around LEDs and address some common misunderstandings....More
An arc flash is associated with the explosive release of energy caused by an electrical arc, due to either a phase-to-ground or a phase-to-phase fault. This kind of fault can result from many factors – a dropped tool, accidental contact with electrical systems, buildup of conductive dust, corrosion or improper work conditions.....More
Abstract: In this webinar, Mike will not only explain the current NEC requirements for GFCIs and AFCIs, but he'll explain how they operate, what causes their premature failure, and when they won't provide the safety protection you might have thought they would.
Abstract: This webinar will teach attendees the difference between risk and hazard, and how the choice of system grounding has a direct impact on reliability and safety.
Arlington’s recessed combination power and low voltage boxes – TV BOX™ and Indoor IN BOX™ – offer secure, convenient & easy way to mount LCD or plasma TVs flush against a wall...More
