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  1. ftutelo

    Automatic Transfer Switches

    Are there set rules and/or requirements regarding the use of a 4-pole vs. 3-pole transfer switch in emergency systems?
  2. ftutelo

    Electric Service Upgrade 460/265 to 480/277

    Thanks to all who responced to my question. Today the utility opened the transformer enclosure, the secodary voltage of the transformer as per the name plate is 460/265v 3phase. This was the standard voltage provided by the utility when this transformer was installed in 1971. Since all the...
  3. ftutelo

    Electric Service Upgrade 460/265 to 480/277

    I am looking into upgrading the electrical service to a commercial building. The building is currently fed from a 460/265v 500kVA service, installed in 1971. The new service will be 480/277 750kVA. All the existing power panels within the building have a voltage rating of 460/265V. Must these...

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