From: Glen Closson (glen@closson.com)
Date: Fri Jul 11 2003 - 19:58:40 PDT
Actually the 220 in homes is out of phase with each other. Otherwise the
net voltage would be zero from L1 to L2 ( assuming they are equally
balanced, etc.). They are 180 degrees out of phase with each other as they
come off either "end" of a transformer with the center tap neutral (and
grounded).
-Glen
-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org]On
Behalf Of Ryan Gill
Sent: Friday, July 11, 2003 3:28 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] Military Air Conditioner/Heater Information
At 1:54 PM -0700 7/10/03, Horrocks, Aaron wrote:
>While I have no experience with military AC/Heating units, I can
>tell you about the juice needed for it!
>
>For 60Hz here's the standards:
>
>Voltage Phase Wires
>120/240 1 3 Used commonly in homes, small business
>120/208 1 3
>120/208Y 3 4
Isn't 120/208 based on it being off of a 3 phase system (4 wires
total at the box?) 208 volts being the sum of 2 hot wires that are
120° out of phase. Home 120/240 involves 2 hot wires that are in
phase and yielding a total sum of 240 volts.
How do you get 120/208 off of a single phase system? Isn't it by
default, off of a 3 phase 4 wire system?
>240 3 3 " " pumps
>120/240 3 4 " " small business
>277/480Y 3 4 " " industrial
277/480 is useful for large installations of flourescent lights. Most
of the floor on CNN center I'm on has 277 based lights.
>
>
>208 volts is one of those funky voltages that (pardon the pun)
>should be phased out!
Hardly, at home in residential, three phase is unusual. What you get
off the pole is single phase. In industrial/Commercial applications
120/208 is the lower voltage component of 277/480. My electrical room
for the Data Center I run has two types of panels for my Data Center.
120/208 and 277/480. The
Perhaps the question here is if that generator is labeled as 208 and
is really 208Y (perhaps no difference, one label is more particular
than another?).
>Usually 208V equipment is cheap because few manufacturers support it, and
most
Its standard for computers, UPS and other applications in the tech industry.
--
Ryan Gill rmgill@SPAMmindspring.com
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'60 Daimler Ferret '42 Daimler Dingo '43 Humber MkIV (1/2)
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