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Wood Type On Street Telephone Poles

Discussion in 'Electrical Engineering' started by Robert11, Mar 13, 2005.

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  1. Robert11

    Robert11 Guest

    Hello:

    This is one of those just-curious type of questions.

    Guess it probably varies throughout the country, but what type of wood/tree
    is used for
    the street telephone/power poles in the northeast ?

    What type of preservative do they use these days ?

    How long do they typically last ?

    Bob
     
  2. Dwayne

    Dwayne Guest

    The coating they use is supposed to last at least 30 years. It's the same
    stuff used in the lumber industry (green treated). I'm not sure what is is
    exactly, but I was told (when I worked in a lumber yard as a lad) it contain
    Arsenic.

    Dwayne
     
  3. Guest

    Ask in misc.industry.utilities.electric ; they should be able to tell
    you all about it.

    Matt Roberds
     
  4. Guest

    They are usually southern yellow pine pressure reated to 2.5 CCA
    I don't know when they will start forcing them to use the new stuff
    but since all the hardware is now galvanized I doubt it will be soon.
     
  5. Tom Lager

    Tom Lager Guest

    (Robert11) wrote in
    Most poles in distrubution (as opposed to transmission) systems are
    Southern Pine, pressure treated with creosote. They are rated as to how
    many pounds of creosote per cubic foot of wood is used in the treatment.
    Durability depends upon how many pounds per cubic foot is retained by the
    wood. An 8 pound treat may last 20-30 years under normal conditions. A
    ten-pound treat may last 30 - 40 years. YMMV. Salt and Copper Chromium
    Arsenate are also used in some areas. CCA poles seem to be more common in
    transmission systems. All preservatives are toxic to some extent, that's
    how they preserve the wood, by killing fungus.
    You may occasionally run across a cedar or chestnut pole. These are
    naturally rot resistant, but expensive and scarce. In the 70's I climbed a
    few that had been in plant since the early part of the 20th century.
     
  6. Mike Lamond

    Mike Lamond Guest

    One of my grandfathers worked for Southern New England Telephone Co. from
    1929 to 1970. The farmhouse he remodeled when he retired has the living room
    paneled in tongue & groove chestnut boards that were milled from old poles.

    Mike
     
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