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Selective Coordination of Elevator Circuits   by Todd Lottman  It is important to provide power for elevators as much as possible, particularly for multiple elevators supplied by a single feeder as an overcurrent on a single elevator circuit could easily cascade up to the feeder and take down the whole bank of elevators. Inspecting Elevator Power Wiring   by Rob Forister Every year, elevators are involved in accidents that kill thirty people and seriously injure seventeen thousand. Article 620 of the National Electrical Code has evolved through the years in an effort to prevent these injuries.

Electrical Safety Precautions During Hurricanes by Electrical Safety Foundation International Beware of hurricane dangers caused when water comes in contact with electricity. Avoid using equipment that has been wet. Always install generators properly. Guidelines to Evaluating Unlisted Products   by Len Frier If an unlisted product goes undetected and it causes a hazard, the electrical inspector could be held accountable. Or if the hazard is in a workplace and results in an OSHA investigation, the employer can be fined. How Does EMC Matter to Global OEM Drives Users-Specifers?  by Mark Kenyon In the U.S., there are no codes and standards that specifically and completely cover electromagnetic compatibility of adjustable frequency drives (AFDs). Perspectives on PV: Making the Utility Connection     by John Wiles More than 90 percent of the new PV systems being installed throughout the U.S. are connected to the local utility with utility-interactive inverters. Unfortunately, in many cases, code requirements are not fully understood or complied with. The NEMA Field Representatives Program!  by Cheryl D. Smith If an inspector has difficulty with a company, the field representative knows exactly how to address the problem and can get both parties together to work it out. Hydrogen Super Highway by Edison Park  Within a year, ground could be broken on a new kind of accelerated highway across America that runs on clean-burning hydrogen-powered magnetic levitation (MagLev) rails, transporting automobiles, freight and people at up to 250 mph. Trusts Can Help You Achieve Estate Planning Goals  by Jesse Abercrombie Estate planning is extremely important for the highly successful electrical contractor who owns several pieces of real estate, retirement plans and other businesses. Concrete-Encased Electrodes Required by Mike Johnston The goal when establishing a grounding electrode or grounding electrode system for a building or structure should be to strive for the best possible connection to the earth. Concrete-encased electrodes have a proven record of providing this. Engineering Series Ratings: Is It Practical?  by National Electrical Manufacturers Association Engineering a series rating without testing is not practical where MCCBs are involved and product standards recommend against the application of series ratings using low-voltage power circuit breakers.

Editorial: Don't Let the Smoke Get in Their Eyes!  by James Carpenter, CEO/Executive Director Our safety systems have served us well since the introduction of that thing called electricity. We have learned the difficult lessons and if we remain diligent, we can keep that skyline without smoke and fire and not electrocute ourselves. Uncontrolled and unmanaged, things could be a lot different. We must remain diligent for the little things! Canadian Code: Single Conductor Issues  by Leslie Stoch Let us review issues concerning induced current flow in the metallic coverings of single-conductor cables. Single-conductor cables have some advantages over multi-conductor cables, especially in larger sizes. Tables 1 and 3 of the Canadian Electrical Code allow us to use smaller wire sizes for single-conductor cables than Tables 2 and 4 for multi-conductor cables.  Electricity Fundamentals: Basic Electricity—Part 8  by David C. Young, PE Electrical resistance is not the only property of materials that resists the flow of current. Let us consider an experiment. Let’s purchase a 12,000-foot spool of insulated 20 AWG copper wire commonly used as communications wire and pull the wire off the spool and lay it out on the ground. UL Question Corner (pdf) by Underwriters Laboratories The “UL Question Corner” answers questions of general interest that are sent in from authorized government inspectors and we believe will have interest for many inspectors. Inspector's Corner: Approved Electrical Equipment Facts and Confusion  by Ark Tssieerev How often in Canada perplexed distributors or wholesalers of electrical equipment provided with various trademarks or other symbols of identification hear from a visiting inspector: "This equipment is not approved. It must not be offered for sale." Electrical contractors can also share some of their confusion, when an inspector rejects a piece of electrical equipment for installation as being "unapproved," although the equipment bears a familiar certification monogram. So, where is the problem, and why do "innocent" wholesalers or contractors encounter such adamant actions from the Canadian electrical inspectors?

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