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Pulling large wire in conduit

Discussion in 'Electronic Basics' started by DaveC, Oct 21, 2005.

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  1. DaveC

    DaveC Guest

    Four AWG #1 conductors in 2-1/2 inch EMT. 50 ft of conduit, four 90 deg.
    elbows.

    Is this combination reasonable to pull with some lubricant? Or should I plan
    some "pull boxes" in this run?

    Thanks,
    --
    Please, no "Go Google this" replies. I wouldn't
    ask a question here if I hadn't done that already.

    DaveC

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  2. CWatters

    CWatters Guest

    Try posting this on the Eelectrical forum at
    http://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl
     
  3. Guest

    You have to be kidding.... "should you plan some pull boxes in this
    run?" ...... absolutely yes..... a pull box at each 90 deg elbow.
    - - - - - - - -- - -
     
  4. SQLit

    SQLit Guest


    I would use a fish tape to install a rope of at least 1/4inch or larger,
    first. If you train the wires through the loop at the end of the rope so
    that they are staggered and tape the head down all should go well.

    Lay the wire out straight and somewhere it is dry, lube as you pull.
     
  5. David

    David Guest

    Only one 90 degree bend is ok. But can't you get inspection elbows. These
    have a removeable cover on the side of the elbow that allows cables to be
    pulled out then fed back in again.
     
  6. Guest

    You should have an electrician give you the proper specifications for
    the job.
    What you are proposing may not meet code.
     
  7. operator jay

    operator jay Guest

    I've never pulled wire. The only two knowledgeable people I ever heard
    speak about it both said to do a pull in the middle of a straight section,
    not at a ninety.

    FWIW.

    j
     
  8. Rick

    Rick Guest

    you have 4 X 90 deg bends? I think you should put a box between the two..
    I'm not sure if a total of 360 deg is impossible to pull. between 50
    feet... yikes.. lemme know how that goes..
     
  9. Guest

    With 4 90-degee turns, even with a lubricant the pull, while possible,
    may be probemlematic. You could possibly accomplish it using a
    hydraullic cable puller, but even then the outsome would be a bit of a
    risk.

    Is there a reason why you can't employ mid-run pull boxes?

    Harry C.
     
  10. Jim Adney

    Jim Adney Guest

    That sounds quite odd. The corners are what will give you all the
    friction, so they make special pull boxes, sort of an L-shaped cast
    box with a long removable cover that allow you to pull the wire out
    there and reinsert it for the next straight run.

    Unless one of your straight runs was extremely long, I would not
    expect to have to install a pull box in the middle of a run.

    # 1 wire is not all that big. This does not sound that hard.

    -
     
  11. Fred

    Fred Guest

    Code in Canada is no more that 3 90 degree bends in a run without pull
    boxes. If you use 4 the pipe had better be very well fastened...something's
    probably going to let go.

    Fred
     
  12. No code book in front of me tonight but I think your conduit is too small
    for four # 1 wires for normal power feeds. It's not just wire size that
    counts you have to consider current in conductor and heating.

    Four 90 degree bends (electricial sweeps) are the limit I think.

    Do you need to use lubricant to pull, If I am helping you will use
    lubricant, if you pull it's your choice.

    I would use a steel cable as a fish tape and a comealong to pull it.

    Hugh
     
  13. DaveC

    DaveC Guest

    Thus spake Hugh Prescott:
    I ended up using 2 90 degree sweeps and two inspection boxes (90's as well).
    Used fish tape to pull nylon rope which was used to pull the wires.

    Man, is it hard work. It's not a big job, but no come-along, just two
    inexperienced guys huffing and puffing.

    An inspection box is an asymmetric item. Pulling the wires into the box in
    the longitudinal direction was relatively easy; feeding them back into the
    "exit" that is 90 degrees to the body was problematic (especially the last 18
    inches, or so). How does one do that last bit of wire so that you don't end
    up with a twisted knot of wires that won't fit in the box?

    1-1/2 EMT is sufficient for four (one is ground) #1 conductors (NEC tables
    referenced).

    Thanks for all your help, guys. Mission accomplished.
    --
    Please, no "Go Google this" replies. I wouldn't
    ask a question here if I hadn't done that already.

    DaveC

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    Please reply in the news group
     
  14. Start at the point where the cables come out of the pull box and
    "straighten' them going along towards the exit of the box. Towards the end
    of the pull if you have twists (common) you can feed the the "crossovers"
    into the conduit in the last few inches od cable, so it is easier to lay the
    last section of cable in. What it comes down to is taking care to try and
    feed the cables in without "crossovers". The extra time spent in tidying up
    the cables and laying them out in one long loop is repayed by the ease of
    installation.
     
  15. How long is the pull?
     
  16. Jamie

    Jamie Guest

    you shouldn't need lube and if it's that tight then
    your not using large enough EMT.
    also, you are allowed a total of 360 deg bends in the
    pipe.
    NE book states no more than 4 bends at 90 degree's
    each.
    if your going to use access elbows/pull elbows then you
    surely don't need lube.
     
  17. Jamie

    Jamie Guest

    it's no problem putting them back in , you simply have the Access Elbow
    loose, side the wires through and then in the other pipe. after that you
    just sit the elbow on the pipe ends and position the pipe with
    wires already inside.
     
  18. Jamie

    Jamie Guest

    other wise known as access elbows.
     
  19. John Ray

    John Ray Guest

    Oh come on! dealing with slack at four 90s is a MUCH bigger pain in the ass
    that the pull itself.
    To the OP...SQLit's recommendation is the right one.

    John
     
  20. DaveC

    DaveC Guest

    Thus spake Igor The Terrible:
    60 ft.
    --
    Please, no "Go Google this" replies. I wouldn't
    ask a question here if I hadn't done that already.

    DaveC

    This is an invalid return address
    Please reply in the news group
     
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