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

Originally Posted by Dom D'Agostino

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.

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.

Originally Posted by Rick Bunzel

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.

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.

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.

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.

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

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

Originally Posted by Joe Borkowski

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).