More than 90 percent of the new PV systems being installed throughout the United States are connected to the local utility with utility-interactive inverters (figure 1). These inverters range in size from about 250 watts (rated ac output) to about 250 kW. Multiple inverters may be used at a single location to provide even higher [...]
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The American Council for Electrical Safety (ACES) is a collaboration that was formed by a variety of regulators responsible for ensuring the safety of electrical products sold in the United States. The council is sponsored by the American Council of Independent Laboratories (ACIL). Members of ACES include chief electrical inspectors, accredited laboratories, government agencies involved [...]
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Electromagnetic compatibility (EMC) is the ability of electrical/electronic equipment to operate in its installation environment while neither causing nor experiencing electromagnetic interference (EMI). EMI is any interference with normal equipment operation caused by abnormal energy entering the equipment either by conduction though wiring connections or by radiated wave reception. Radiated EMI is also called radio [...]
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Every year they are involved in accidents that kill thirty people and seriously injure seventeen thousand.1 Before you let that statistic scare you into using another route, remember that you are fifty times more likely to get hurt taking the stairs. Also, half of these deaths involve people who are working on elevators.2 Falls or [...]
(1 votes, average: 4.00 out of 5)Inductive reactance 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. If we take [...]
(No Ratings Yet)Imagine traveling from New York to Los Angeles by car in 10.5 hours, while the rail system you are running on is producing enough extra hydrogen to power 70 percent or more of the nation’s entire energy demand at no extra charge? Sounds impossible? Don’t bet against it. If a young group of dedicated pioneers [...]
(No Ratings Yet)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 [...]
(1 votes, average: 5.00 out of 5)In this article, 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 [...]
(No Ratings Yet)The National Electrical Manufacturers Association Field Representatives Program promotes the use and adoption of the National Electrical Code and monitors regional developments of importance to the electrical manufacturing industry. Electrical inspectors can rely on the field representatives’ expertise to interpret how the Code applies to specific installations and to provide a direct link to manufacturers, [...]
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During the past revision cycle for the 2005 NEC, a new definition was created in Article 100 for selective coordination. The need for this definition can be taken from its creation and shows the expansion of selective coordination requirements throughout the NEC. One of the basic requirements for the creation of a definition in Article [...]
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IAEI, as the keystone of the electrical industry, is a membership driven, non-profit association promoting electrical safety throughout the industry by providing premier education, certification of inspectors, advocacy, partnerships and expert leadership in Electrical Codes and Standards development.
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