[time-nuts] Where does 28V come from?

Mike S mikes at flatsurface.com
Tue Jul 21 14:46:25 UTC 2009


At 10:25 AM 7/21/2009, n3izn at aol.com wrote...
>Not to steal the thread, but any one know why the telephone company 
>choose to use a negative voltage? Where as the positive is referenced 
>to ground? When I was a kid I was told it was because they discovered 
>that the battery terminal would corrode if it was done that way?

Using negative voltages on the lines (referenced to ground) reduces 
corrosion, by making the conductor cathodic.





More information about the time-nuts mailing list