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Compressed Air Tank on Power Lines

Discussion in 'General Electronics' started by AlWahrabi, May 14, 2004.

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  1. AlWahrabi

    AlWahrabi Guest

    I often see a compressed air (or is it oxygen or acetylene?) tank attached at
    the base of a telephone pole and apparently hooked somehow into the power
    line...for some odd sort of diagnostics. I can never figure out what the
    possible connection might be: why an air bottle is attached near the power
    line. Any suggestions appreciated.
  2. Externet

    Externet Guest

    Seems you are assumming the bottle contains gas. Seems yo are
    assuming the compressed gas is hooked to the power lines. You are
    assumming the gas is air, oxigen or acetylene. You are assuming
    telephone poles carry electric power.
    Not only power lines are hanging from poles. Can be telephony,
    communications, coaxials, signalling, etc.

    Gas can be used to pressurize jacketed or ducted communication cables
    to expel or prevent moisture from entering the jacket and causing
    crosstalk or corrosion.
  3. Wade Hassler

    Wade Hassler Guest

    When I was a youngster, a Phone Guy told me it was a nitrogen tank
    that purged a junction box containing two spliced ??-pair cables. Kept
    oxygen out by keeping an ever-so-slight positive pressure in the can.
  4. iQbal

    iQbal Guest

    Thats quite possibly a step down transformer.

  5. JeffM

    JeffM Guest

    Bottles of dry air or nitrogen are connected to telephone lines
    to give a positive pressure and prevent the moisture in ambient air
    from condensing and causing crosstalk problems.
  6. Nirodac

    Nirodac Guest

    Correct (no, not the transformer reply). The cylinders contain compressed
    nitrogen (generally) and are used as stated earlier, to displace moist air
    in the communications cable. They only use the gas when repairs are needed
    or there is some major issue (like a large leak, or an splice in progress
    where the cable sheath has been opened ). Normally the communications
    cables are pressurized at the headend, in the central office, with pre dried
    air . Water or moisture in a telephone cable is definitely a bad thing.
    Some newer communications cable use a grease around the conductors, instead
    of air. The grease prevents moisture from reaching the copper.
  7. Oooh that grease is NASTY. I recieved a short length of that wire from a
    "friend"... a bundle of solid conductors each in its own color coded sheath.
    Was going to use it for breadboarding. The grease got all over the place.
    It was white, like lard, and squeezed out of the bundle whenever it was
    flexed. Yuck.
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