24 Feb
2003
24 Feb
'03
12:51 p.m.
----- Original Message -----
From: "William Donzelli" <aw288(a)osfn.org>
To: <cctalk(a)classiccmp.org>
Cc: <cctalk(a)classiccmp.org>
Sent: Monday, February 24, 2003 9:26 PM
Subject: Re: Stratus and 220V
And a center-tapped grounded conductor for two phase five wire is what I
read about in skool. At least now I know what it was used for!
> Errr.... 220V comes in single phase and three
phase flavors. While I
> believe 2 phase power does exist, it's somewhat esoteric-- I've never
even
*heard* of
one, let along seen one.
There once was two phase - four wires with the phases 90 degrees apart -
but it is basically "gone"* now. A few big old Navy radio transmitters
from the 1920s used in for the motor-generators.
*It may still be held on in old factories. Remember, New York City *just*
discontinued DC power distribution!
The last time I installed a service (1200A 208V 3P w/ 400KW backup genset
IIRC-- very interesting!) in Dayton, Ohio the power company service handbook
made the assertion that they were not taking any new Edison power customers
but made no mention of how many, if any, were still on the books.
William Donzelli
Bob