Two 12-4 Romex cables through the same floor joist holes

Discussion in 'Electrical Forum discussion & Blog' started by pex006, Jul 5, 2014.

  1. pex006

    pex006 New Member

    Messages:
    27
    Location:
    Pittsburgh, Pennsylvania
    Hi. Can two 12-4 Romex cables be put through the same floor joist holes. The holes have about a 1 inch in diameter? They would run together through three floor joist holes for about 6 feet before separating and entering a junction box. I thought derating wouldn't apply since there are only 8 current carrying conductors.
  2. Speedy Petey

    Speedy Petey Licensed Electrical Contractor

    Messages:
    996
    Location:
    NY State, USA
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,641
    Location:
    Cave Creek, Arizona
    Electricians sometimes put as many wires through the hole as will fit.
  4. bluebinky

    bluebinky Member

    Messages:
    393
    Location:
    Santa Clara, CA
    Uh oh - the R word.

    Take you time when pull them so you don't burn off the sheathing. One inch sounds kinda tight for 2 x 12-4...
  5. pex006

    pex006 New Member

    Messages:
    27
    Location:
    Pittsburgh, Pennsylvania
    Thanks for the replies everyone. The holes might be a little bigger than 1 inch. I ran two 12-4 through to see if they would fit and they went through pretty easily.
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