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From: slb@drutx.UUCP (Sue Brezden)
Newsgroups: net.sci
Subject: Choice of voltage?
Message-ID: <107@drutx.UUCP>
Date: Fri, 28-Feb-86 10:42:55 EST
Article-I.D.: drutx.107
Posted: Fri Feb 28 10:42:55 1986
Date-Received: Sat, 1-Mar-86 16:27:25 EST
Organization: AT&T Information Systems Laboratories, Denver
Lines: 15

>	Does anyone know why 60hz was chosen as the standard frequency
>	for the AC power distribution system in North America??

Along the same lines, why -48 volts for telephone lines.  I understand
the negative voltage is to prevent loss of copper.  But 48?
-- 

                                     Sue Brezden
                                     ihnp4!drutx!slb

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      Nirvana?  That's a place where the powers that be and
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