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-   -   300 amp wire size (https://www.askmehelpdesk.com/showthread.php?t=498683)

  • Aug 16, 2010, 07:12 AM
    Roseparsons
    300 amp wire size
    I want to install a 300amp t from the main panel this is a commercial . What gauge and type of copper wire and what size conduit whould I use.
  • Aug 17, 2010, 12:47 PM
    tkrussell
    And what if I told you #2 in 4 inch conduit? Would you believe me?

    Where is this located?

    Phase?

    What type conduit?

    Location of conduit?

    Are you an electrician?

    Commercial what? Elaborate on the building.
  • Aug 28, 2010, 03:03 PM
    wplash420
    Why would you tell someone #2 in a 4 inch conduit... I mean if your going to with someone... just tell them to pound sand or something. Don't intentionally give them the wrong information... even if its in the form of a question. That's dangerous and stupid.
  • Aug 28, 2010, 03:07 PM
    wplash420

    Oh and by the way... its 350 kcmil in a 2 1/2 inch conduit for the average commercial installation into a 300 amp panel.
  • Aug 29, 2010, 04:11 AM
    tkrussell
    Since when is information in a question providing that information?

    This is not Jeopardy. In my world a question does not provide information.

    My point is a generic question was asked with a great deal if detail missing. And my other point is that anyone installing a 300 amp commercial feeder better have some knowledge and experience.

    I am glad your able to speculate on the details that were not provided.

    If it is single phase, and 4 - 350 MCM copper THHN/THWN can fit in a 2.5 " PVC Sch 40, the 3- #350 MCM and 1 equipment ground will fit.


    If this question involves 3 phase, then what?

    If Sch 80 is used, then only 3 # 350 MCM THHN/THWN will fit.

    Assuming you know all the missing details and situations is dangerous.

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