basic electric theory-#1

Discussion in 'Homework Help' started by xbox112005, Nov 2, 2011.

  1. xbox112005

    Thread Starter New Member

    Oct 30, 2011
    You are an electrician working in a industrial plant.The company is constructing a maintenance shop located 225 feet from the main plant electrical system.You are to install a 400 ampere three phase wire system in the new maintenance shop.The service is supplied by the existing plant service.The voltage is 480 volts and the voltage drop is to be kept at 3% or below at full load.The conductors are to be aluminum.What size conductors should be install for the new service?
    Last edited: Nov 2, 2011
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    There is missing information such as required maximum demand for the installation, allowable voltage drop and whether the cables are enclosed or buried etc....
  3. Evil Lurker


    Aug 25, 2011
    Depends on the amperage your needing to supply, what electrical code calls for, and some headroom calculation in the event additional amperage is needed due to future equipment upgrades.

    Also, if a lot of amperage is required, it might be better to run high voltage wire to the shop area and then feed it into a step down transformer.
    Last edited: Nov 2, 2011