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  1. #1
    Join Date
    Mar 2010
    Location
    Prairie du Sac, Wisconsin
    Posts
    9

    Question Phone transformer? What's this?

    Has anyone seen these and what are they? The little black box is about 1 1/2" x 3" x 1/2" thick. The aluminum enclosure is about 2" x 4" x 10". I advised for them to be removed. 1950's vintage home. Thanks Joe

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  2. #2
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,340

    Default Re: Phone transformer? What's this?

    Old telco demarc for POTS line. Why tell them to remove phone line equipment?


  3. #3
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    930

    Default Re: Phone transformer? What's this?

    Quote Originally Posted by Dom D'Agostino View Post
    Old telco demarc for POTS line. Why tell them to remove phone line equipment?
    You talk like a splicing tech.
    Spent a little time in Local 21 myself.


  4. #4
    Join Date
    Mar 2007
    Location
    Anacortes, Washington
    Posts
    395

    Default Re: Phone transformer? What's this?

    With the big ground cable does the demarc also function as a lightning arrestor?


    //Rick

    Anacortes, Wa. Home Inspections by Pacific Crest Inspections in Skagit, Snohomish, Whatcom and Island Counties, Washington.

    Rick Bunzel
    WWW.PacCrestInspections.com
    360-588-6956

  5. #5
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    930

    Default Re: Phone transformer? What's this?

    Quote Originally Posted by Rick Bunzel View Post
    With the big ground cable does the demarc also function as a lightning arrestor?


    //Rick

    Anacortes, Wa. Home Inspections by Pacific Crest Inspections in Skagit, Snohomish, Whatcom and Island Counties, Washington.
    No ,they need to be grounded also.


  6. #6
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,546

    Default Re: Phone transformer? What's this?

    Around here, the old posts are used for terminals for attaching the new landlines. For some reason, the guys that install telephones in old houses really like those old transformer blocks.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  7. #7
    Join Date
    Jan 2011
    Location
    Mississauga, Canada
    Posts
    42

    Default Re: Phone transformer? What's this?

    It is just a old style terminal block used at at the demarc point. You see where drop wire (authority wire from the street) meets the interior wire (house wire).

    Surely not a transformer.

    Thanks,
    Mike.


  8. #8
    Join Date
    Mar 2010
    Location
    Prairie du Sac, Wisconsin
    Posts
    9

    Default Re: Phone transformer? What's this?

    Thanks to you all. Glad that it is what I suspected. My reason for suggesting removal was because the cover was not secured and I thought there was potential for hot wires to arc against the aluminum cover. I'm relatively new and just haven't seen it all and I expect I never will. The client was not to concerned about using or having a landline anyways.


  9. #9
    Join Date
    Dec 2008
    Location
    Maryland
    Posts
    2,777

    Default Re: Phone transformer? What's this?

    Joe,
    Do you know how much voltage / amperage the line carries?


  10. #10
    Join Date
    Mar 2010
    Location
    Prairie du Sac, Wisconsin
    Posts
    9

    Default Re: Phone transformer? What's this?

    No Gary I don't. Did not measure. I did read somewhere that it's about 48 VDC and probably low amperage.


  11. #11
    Join Date
    Dec 2009
    Location
    Florida
    Posts
    552

    Default Re: Phone transformer? What's this?

    Quote Originally Posted by Joe Borkowski View Post
    No Gary I don't. Did not measure. I did read somewhere that it's about 48 VDC and probably low amperage.
    48 VDC and 90 VAC (Ringing Signal).


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