[132855] in North American Network Operators' Group
Re: Want to move to all 208V for server racks
daemon@ATHENA.MIT.EDU (Seth Mattinen)
Thu Dec 2 11:44:15 2010
Date: Thu, 02 Dec 2010 08:38:22 -0800
From: Seth Mattinen <sethm@rollernet.us>
To: "nanog@nanog.org >> \"nanog@nanog.org\"" <nanog@nanog.org>
In-Reply-To: <AANLkTikWUx4V=6vxsCEx8i0T8FE6UxWNpazqXUeNkT+5@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 12/2/10 8:30 AM, Jay Nakamura wrote:
>> you mean 240V AC 50HZ and move from 120V 60Hz? (or also 50Hz)
>
> In US, I think everything is 60Hz. But I mean 208v single phase.
> (Which is what you get when you combine two 120v single phase legs out
> of three phase, I believe. I am not an expert on AC...)
Correct, a L-N connection will get you 120V, a L-L connection will get
you 208V. Everything in the US is 60Hz.
>> you will need to check each device if it supports 240V, commonly the
>> specified power ratings are printed at a stricker on the device itself.
>
> I have even been looking at USB HD AC adapter and all other odd ball
> equipment and I always see the label say "100~240v AC". Dell's old
> rack mount monitor/KB from 5 years ago even supports 208v (Just wrong
> connector.)
>
The vast majority of power adapters are switching these days and will
run up to 240, it's when they have built in NEMA 1-15 or 5-15 prongs
that you have to overcome.
~Seth
