[114799] in North American Network Operators' Group
RE: Why choose 120 volts?
daemon@ATHENA.MIT.EDU (Dave Larter)
Tue May 26 19:58:41 2009
Date: Tue, 26 May 2009 19:58:18 -0400
In-Reply-To: <20090526235142.GB869478@hiwaay.net>
From: "Dave Larter" <dave@stayonline.com>
To: "Chris Adams" <cmadams@hiwaay.net>,
"Joe Greco" <jgreco@ns.sol.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Yes, you are correct Chris. The loss from getting 240 from two legs is
due to the fact that it is at 120 instead of 180 deg's.
-----Original Message-----
From: Chris Adams [mailto:cmadams@hiwaay.net]=20
Sent: Tuesday, May 26, 2009 7:52 PM
To: Joe Greco
Cc: nanog@nanog.org
Subject: Re: Why choose 120 volts?
Once upon a time, Joe Greco <jgreco@ns.sol.net> said:
> And I don't like not having anywhere to plug in my power screwdriver's
> recharger... I suppose I should see if I can find someplace that has
> a transformer of an appropriate size, or does anyone already have the
> part number for something that can provide a few hunderd milliamps of
> 120V from 208? :-)
Isn't 208V usually provided as a connection across two phases of a 3
phase circuit? In that case, you get 120V by going between one phase
and neutral (no transformer required).
You need a NEMA 14 (4 wire) connector to get two phases, neutral, and
ground (provides 1 208V circuit and/or 2 120V circuits) or a NEMA L21
(5 wire) connector to get all three phases, neutral, and ground
(provides 3 208V circuits and/or 3 120V circuits).
--=20
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
