Industry organizations that include NEMA have commented on new building code proposals in California that, in the name of energy efficiency, would require permits for something as simple as changing the ballast in a fluorescent light fixture. On the face of it, a building permit for a ballast changeout does seem ridiculous. As a practical matter, many people won’t pay much attention to the rule, which is a bit of a problem in itself.
Even engineers sometimes get confused by energy-related terms such as VAR, Watt-hour, and power factor. Here’s help sorting out the differences. A one-kilowatt oven that is on for one hour will consume one kilowatt-hour of energy. Are energy units that easy? On rare occasions, they are. When they are not, it helps to have a fundamental understanding of power and energy.
Many engineers look at NEMA Premium grade as the gold standard for induction motor efficiency. But technical innovations now make possible even more power-miserly designs. By now, most engineers who work with induction motors know that new efficiency standards went into effect for them last year. But there are ways to improve efficiency levels above even those mandated by the new regulations.
Sales of such electric vehicles as the Toyota Prius, Nissan Leaf, and Chevy Volt are on the rise, and so, too, is the need for a comprehensive recycling strategy once their batteries wear out. The rechargeable batteries used in electric vehicles (EVs) and hybrid electric vehicles (HEVs) are expected to last eight to 10 years, after which they must be replaced. But there is still an open question about what to do with these partially spent batteries once the time comes.
Automation Systems Interconnect Inc. (ASI) introduces a new line of solar connectors. The ASIPV series is compatible and intermateable with industry standard 4-mm connectors. The new connectors are available with a 1,000 Vdc (IEC), 600 Vdc (UL), and 25 A rating. Both male and female contacts have a wire range of 12-10 AWG.
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