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    neilgirrard's Avatar
    neilgirrard Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 31, 2008, 10:10 AM
    Wire & underground conduit size
    Hi,

    I will need an electrical wire run between a small transformer and the main control panel for the house. I expect the transformer to push 220 or 240 volts at 200 amps. The transformer will be just under 140 feet from the panel. What size wire should I use and what is the minimum size schedule 40 underground conduit I should use? Schedule 80?

    Thanks,

    Neil Girrard
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #2

    Jul 31, 2008, 01:07 PM
    A 48 KVA (240 volts times 200 amps) transformer is not what I would consider small.

    What exactly are you trying to do?

    The upside to using a transformer is to use the primary voltage for the long feeder, and then step down at the load end.

    What is the primary and secondary voltages?
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