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Locating conduit in floor

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  1. #1
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    Default Locating conduit in floor

    I have a plastic conduit about 6meter long and buried about 50mm down in a concrete floor. I have access to one end to thread a wire through, the other end is somewhere on the opposite side of the room. Can anyone suggest how I can find the postion of the other end?
    Thanks, Ken

  2. #2
    Senior Member NCArcher's Avatar
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    Why cant you work out where the other end is?
    A bit more info required.
    If the other end is buried push a snake or stiff wire into the conduit till it hits the end then lay the snake on the concrete to give the end position. Only works if there are no bends of course.
    Aoccdrnig to rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a total mses and you can sitll raed it wouthit porbelms. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

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    That will give me the distance from the open end but not the lateral position. If I poked in a return wire and ran a low voltage current through the wire, is there an instrument that can pick up the charged wire beneath. I have noticed Telecom guys dig up cables with some accuracy but have not seen how they locate the cables.
    Thanks, Ken

  4. #4
    Senior Member NCArcher's Avatar
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    The instrument you need is a cable locator but they start at around $1000 for a half decent one. You might be able to hire one for a couple of hours.
    Aoccdrnig to rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a total mses and you can sitll raed it wouthit porbelms. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

  5. #5
    Diamond Member Barry_White's Avatar
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    If you push the snake or the wire in and push it backwards and forwards so it hits the end of the conduit and makes a noise and get someone else to listen it should give you an approx location.

    Or fill it with water and devine it.
    Regards Bazza

    Skype Username: bazzabushy

    "Experience is a hard teacher because she gives the test first, the lesson afterwards."
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    The views expressed by the poster are general in nature and any advice should be taken in this vein. The poster accepts no responsibility if this advice is used. When undertaking any work personal professional advice should be sought from suitably qualified persons in the field of work being undertaken.


  6. #6
    Senior Member NCArcher's Avatar
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    Quote Originally Posted by Barry_White View Post
    Or fill it with water and devine it.
    Nice tip Barry.
    Happy Birthday by the way
    Aoccdrnig to rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a total mses and you can sitll raed it wouthit porbelms. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

  7. #7
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    is there reo in the concrete, if not you may be able to use a metal detector to sense the copper.

  8. #8
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    Default mebbe

    Quote Originally Posted by kandjc View Post
    That will give me the distance from the open end but not the lateral position. If I poked in a return wire and ran a low voltage current through the wire, is there an instrument that can pick up the charged wire beneath. I have noticed Telecom guys dig up cables with some accuracy but have not seen how they locate the cables.
    Thanks, Ken
    I've got a stud detector GMC which also detects "live" wires and nails...
    Finds elec wires behind gyprock and stuff - but dunno about 50mm concrete... it will ignore the reno (I think) when turned to "live" wire detection...
    Jedo
    When all the world said I couldn't do it - they were right...

  9. #9
    Senior Member DavidG's Avatar
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    1. Blow smoke in and look for where it comes out.
    2. Blow compressed air in and listen for it coming out.
    3. as 2 but put some flour in the pipe first.

    Above assumes the end is not buried.

    1. If end is buried then fill with water and look for a wet spot.
    2. Slide an stick of jelly with an electric det right to the end. Apply power and the end is (was) in the resultant hole.
    For the best results I use -

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