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  • Eaton Expands Variable Frequency Drive Line

    Eaton has expanded its PowerXL Series DG1 variable frequency drives to include a new Frame 6 option. Aimed at the global commercial, industrial and original equipment manufacturer (OEM) market, the new Frame 6 drive option increases available power from 150 to 250 horsepower, adding agility, reliability and safety while reducing energy consumption to help customers reduce energy costs.

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  • Being Selective When Talking About Coordination

    Ensuring a minor branch-circuit electrical fault doesn’t travel any farther upstream is a goal of any electrical designer’s plans. However, in some settings, isolating such problems is especially critical. This is why the National Electrical Code (NEC) has paid a great deal of attention to the specification of appropriate fuses and/or circuit breakers to achieve “selective coordination” over the years.

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  • Business Information and the Cloud

    I've seen a lot of changes in business computing over the last three decades. Once upon a time, all you needed was a large enough closet to house a server or two. And, of course, some cable looms to keep your cabling neat and tidy.

    A rack system on the wall supported a few ethernet switches to handle incoming cables and route them to the servers. To keep things cool, an air conditioner was ducted into the space, ensuring the equipment wouldn't overheat.

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  • Data Center Products: More than Just Neat and Tidy

    In a previous article, I mentioned how data centers evolved from tiny spare closets to huge data-only facilities, often housed underground.

    There's no doubt that as the need for big data and other information increases, the data centers that gather and distribute this information will evolve as well. And, they're getting huge.

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  • Keeping Current on Voltage-Testing Options

    Among the most basic tasks for electrical contractors is testing for the presence – or absence – of electrical voltage. Whether it’s simply to determine if a system is de-energized and safe to work on, or part of a more complicated troubleshooting exercise, voltage testing is a critical element in any contractor’s job. Choosing the right tester can be more than an issue of convenience, it also can make a difference in an electrician’s productivity – and, more importantly, safety.

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  • Input Sensors – Your eyes, fingers and…more?

    No need to "eyeball" it any more. Input sensors take the place of our human senses… and do a great job of it, to boot.

    There are several types of input sensors. One of the first I encountered was the photo electric sensor or photo eye. These eyes controlled remote relays with a set of integrated mechanical contacts. Located inside the sensor body, the contacts changed state with a tiny magnetic relay.

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