Do I need conduit?

Discussion in 'Electrical Forum discussion & Blog' started by comfun1, Feb 23, 2010.

  1. comfun1

    comfun1 New Member

    Messages:
    12
    Location:
    S.E. Kansas
    I could not get any 4-2 wg to connect my air handler to my breaker box so I bought 4 copper and 8 copper single strand. Can I bundle these together and run them through the attic like romex or do they have to run in conduit?
  2. Jim Port

    Jim Port Electrical Contractor

    Messages:
    156
    Location:
    Maryland
    Individual conductors like you bought need to be installed in a complete conduit system from the panel to the unit or junction box. You just cannot run conduit part way and slide the conductors through.
  3. comfun1

    comfun1 New Member

    Messages:
    12
    Location:
    S.E. Kansas
    According to my calculations two 4's and an 8 can run in 3/4" conduit and be within the 40% fill rule. Am I right?
  4. Jim Port

    Jim Port Electrical Contractor

    Messages:
    156
    Location:
    Maryland
    What type of conduit?
  5. comfun1

    comfun1 New Member

    Messages:
    12
    Location:
    S.E. Kansas
    PVC plastic conduit
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,251
    Location:
    Cave Creek, Arizona
    My book says 1".
  7. comfun1

    comfun1 New Member

    Messages:
    12
    Location:
    S.E. Kansas
    There are two 4's and an 8. I looked at a chart and it said 1" for three 4's, so I calculated it for two 4's and an 8 and got 3/4". Was your chart for two 4's and an 8, or three 4's?
  8. Jim Port

    Jim Port Electrical Contractor

    Messages:
    156
    Location:
    Maryland
    Table C9 only allows 1 #4 in a 3/4, and 3 #4s in a 1", based on THHN
  9. Alectrician

    Alectrician DIY Senior Member

    Messages:
    689
    #4 wire for an air handler?


    Must be heat strips.


    Just get the right cable.
  10. comfun1

    comfun1 New Member

    Messages:
    12
    Location:
    S.E. Kansas
    You're right. Heat strips it is. I have decided to run them in a 3/4" smurf pipe and see what the inspector says
  11. Furd

    Furd Engineer

    Messages:
    446
    Location:
    Wet side of Washington State
    I guess that's okay as long as you don't mind doing it over. One-inch conduit is the correct size.
  12. Jim Port

    Jim Port Electrical Contractor

    Messages:
    156
    Location:
    Maryland
    But those red tags add a splash of color.
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