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waterproof wire

Discussion in 'Electronic Design' started by Matt, Sep 17, 2006.

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  1. Matt

    Matt Guest

    i am looking for a type of wire that can withstand constant contact
    with water. the wire cannot have a jacket on it. thanks for any help.
     
  2. mkaras

    mkaras Guest

    Consider then the highest quaity stainless steel wire you can get.

    Go to http://www.mcmaster.com/

    and type in to the Find Products search box:

    stainless steel wire

    - mkaras
     
  3. Matt

    Matt Guest

    does stainless steel wire conduct electricity.
     
  4. Matt

    Matt Guest

    does stainless steel wire conduct electricity.
     
  5. Yes. Not so well as copper, or aluminum, but much better than
    plastic, rubber or glass. I use stainless steel wire as an heating
    elements in my winter gloves.
     
  6. mkaras

    mkaras Guest

    Sure it conducts electricity.

    You will have to ask yourself what you intend to do with a wire under
    water that is conducting a current however. There are several
    concerns...

    1) The water in most cases will itself be conductive and so the
    conductivity of the water can disturb any current flow through the wire
    in inverse proportion to the conductivity of the bare wire.

    2) If you are using the wire for the likes of high voltage such as AC
    mains or higher be very aware that there could be an extreme saftey
    hazard where you have your wire in the water.

    3) An electrical potential applied to the wire that is capable of
    establishing a current path also through the water could setup an
    electrical reaction at the wire/water boundary that could plate the
    wire, corrode the wire, or other similar activity.

    - mkaras
     
  7. Guest

    This won't necessarily work. If there is electricity flowing, the wire
    will corrode quickly in (for instance) salt water; the oxide layer that
    protects
    the wire from rusting does NOT protect from electrolytic attack.

    Unless the water in question is deionized, the metal will corrode at
    any potential differing from ground by more than a few millivolts.
    I've
    rusted clear through a sheet of stainless shim stock with about 4V, and
    it didn't take long.

    Titanium's oxide is stable in salt-water environment, I believe.
     
  8. J.A. Legris

    J.A. Legris Guest

    At the other end of the impractical spectrum, consider 24K gold.
    Conducts real good and stays as shiny as a doubloon.

    Seriously, to the O.P., what are you using the wire for?
     
  9. Jamie

    Jamie Guest

    many common insulation's can with stand water..
    direct barial wire comes to mind how ever, some
    of these compounds stiffen up abit ,
    you might look into "Silicone Rubber Cord"
    make sure you get water proof wire nuts..
    :)
    arrivederci, tally-ho, good bye and all that
    crap.
     
  10. IS the pope German?

    One will need to use platinum or pure gold, but even those will
    corrode eventually. From memory, gold doesn't react with oxygen, so I
    don't know why it corrodes. But I suspect it may be due to impurities.
    Its been years since I did material science in uni, but I would like
    to here this answer from a knowledgeable science dude/ette.
     
  11. J.A. Legris

    J.A. Legris Guest

    I think you're right, it's not the gold that corrodes, it's everything
    else. According to wikipedia, the reaction products of gold corrosion
    tend to spontaneously decompose back to the metal - it's
    thermodynamically unfavourable for gold to corrode (in most cases -
    notable exception: using it as a submerged conductor).
     
  12. linnix

    linnix Guest

    Not so well as copper. We have some 20 mils copper alloy wires (medium
    tensile strength) left-over. They will last at least 10 years with
    moisture, same as copper water pipes. How many yards do you need?
     
  13. Guest

    Use stainless Steel fishing leader. It may not last forever but it
    will last a normal person's lifetime, even in salt water.
     
  14. linnix

    linnix Guest

    Unless you are trying to heat the pond, stainless steel would have too
    much energy lost. Copper alloy wire is the best choice.
     
  15. qrk

    qrk Guest

    Titanium wire holds up to direct contact with water, fresh and salt.
     
  16. Guest

    There is a little more on this over at rec home repair. The OP is
    trying to sense water level in a pipe. Better plans have been
    presented, like using a tube and water pressure.
     
  17. On Mon, 18 Sep 2006 16:16:44 -0400, in sci.electronics.design
    Then WTF didn't he say that?


    martin
     
  18. Jamie

    Jamie Guest

    you know, i work at a wire manufacturing plant for years now, when we
    speak of wire its the conductor with the insulation on it. for me it
    gets a little confusing.
    are we talking about wire or conductor?
    this is from a series of responses i have seen from the original
    poster.
     
  19. ehsjr

    ehsjr Guest

    How do you know it would have "too much energy lost"?

    Ed
     
  20. I'm not an expert but do have this impressive tome
    entitled "The Corrosion Handbook". Bits quoted below.

    Pure gold has a low chemical affinity for most elements
    and this is the reason for its corrosion resistance,
    (rather than the formation of passive films).

    ..... Gold, however, is rapidly attacked by chlorine,
    bromine, and generally by iodine. Iodine as a KI
    solution is particularly corrosive.

    I think that those are all halogens and the rate of
    corrosion is rapidly increased with moisture.
     
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