Medium-voltage (MV) generators are not designed to withstand full fault current during a single phase-to-ground fault, which is why they are connected...More
Understanding the potential transformer (PT), a conventional, single-phase transformer that has its primary and secondary windings on a common core...More
With the advent of systems at frequencies above 60 Hz, we've seen increased interest in the rating of cables in these applications. Mainframe computer...More
When plumbers Jim and Dave arrived at a new residential development, their task at hand certainly seemed routine performing trim-out work (installation...More
In the December 2008 issue of EC&M, we talked about calculating the inductive reactance of conductors that are in close proximity to (or touching) one...More
The importance of bonding and grounding in commercial, industrial, and institutional buildings cannot be overstated. The grounded circuits of machines...More
Of more than 4,000 U.S. military deaths recorded in Iraq since the 2003 invasion, two, in particular, have haunted the halls of Congress, corridors of...More
As backup power sources become more common in residential construction (Photo 1), many homeowners have learned about the needs and benefits of transfer...More
You would think one of the most basic concepts of an electrical system would be the most widely understood. But after years of working in the electrical...More
In this last installment, we'll talk about using simple parallelogram relationships and trigonometry to determine neutral currents in balanced and unbalanced circuits....More
Last month, we clarified the definition of a vector and showed you how vectors are added, subtracted, multiplied, and divided. This month, we'll see how...More
Proper grounding and bonding prevent unwanted voltage on non-current-carrying metal objects, such as tool and appliance casings, raceways, and enclosures, as well as facilitate the correct operation of overcurrent devices....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.
