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  • Users: hdp
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  1. hdp

    Amsterdam Electrical Device

    Can one of you more international gents let me know what this device is? I think it is a generator transfer switch. A USA associate is looking at properties and needs some advice as to electrical infrastructure. Thanks, HDP
  2. hdp

    120/240V Single Phase Generator for Backup of 208Y120V 1P Load

    I have a customer that needs to provide standby power for lyophilizers (freeze drying equipment). They are rather expensive, multiple compressor loads. These loads are 208V single phase, fed from a 208Y120V service. To minimize expense, the customer wants to use a 120/240V residential single...
  3. hdp

    Circuit All Equipment in this Room to the Same Electrical Phase?

    I am working on the electrical design for a fairly technical office building with Video - Teleconferencing Rooms. The boiler plate information on the client rough-in and circuitry requirements indicates that all this audio-video equipment should be connected to the same electrical phase "to...
  4. hdp

    Smoke Dampers Required in 3 Story Dorm?

    Gentlemen: I was asked to budget a minor retrofit of a military dormitory in U.S. I'm an electrical contractor. The original scope of work was primarily plumbing and carpentry - redoing the dorm room restroom facilities. These restrooms had individual exhaust fans, ducted between floors...
  5. hdp

    Corner Grounded Wye?

    I have a client that operates a large distribution facility in the US (approx.800,000 sq. ft.). The service is fed from a 12.47kV/480V padmounted transformer that is wound delta/wye. The service is 3 wire with B phase grounded. The grounding strap from x0 to the tank was not removed when the...
  6. hdp

    600V 400A 3 Pole Double Pole Double Throw Switch

    I have an application in which I would like to use a DPDT switch to toggle between two loads, connecting a source to the common terminal. In the typical DPDT switch application, a load is connected to the common terminal and is toggled between two sources. In that many of these switches I've...

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