Re: Want to move to all 208V for server racks

["Justin M. Streiner" <streiner () cluebyfour org>]

On Thu, 2 Dec 2010, Jay Ashworth wrote:

> No, I'm pretty sure he means "across the 2 high legs of a 120/208 3ph
> Wye service", and I'd never heard that idea suggested before.  I can see
> why it reduces the amount of copper you need to run, but it seems as if
> it would have compensating disadvantages, though I can't think precisely
> what they might be at the moment.

The only ones I can think of are relatively modest, such as needing 2-pole 
breakers or a pair of ganged single-pole breakers for each circuit, so a 
panelboard would only be able to support half as many 208V circuits as 
120V circuits.

That could translate into needing more panelboards, more/larger switchgear 
to feed those panelboards, etc, but you can plan for this up-front easily 
enough if this new construction or a re-fit of an existing space.

The panelboards we put in our DR site last year are quite large, so we 
have some room to grow, and we also used 3-phase PDUs with both 120V and 
208V receptacles, there are fewer individual circuits going out to each 
cabinet.

jms

> ----- Original Message -----
> > From: "Ingo Flaschberger" <if () xip at>
> > To: "Jay Nakamura" <zeusdadog () gmail com>
> > Cc: "NANOG" <nanog () nanog org>
> > Sent: Thursday, December 2, 2010 11:22:32 AM
> > Subject: Re: Want to move to all 208V for server racks
> > Dear Jay,
> >
> >
> > > I really want to move all newly installed internal and customer
> > > racks
> > > over to all 208v power instead of 120v. As far as I can remember, I
> > > can't remember any server/switch/router or any other equipment that
> > > didn't run on 208v AC. (Other than you may need a different cable)
> > > Anyone have any experience where some oddball equipment that
> > > couldn't
> > > do 208v and regret going 208v? We won't have any TDM or SONET
> > > equipment, all Ethernet switches, routers and servers. I have
> > > control
> > > over internal equipment but sometimes customers surprises you.
> >
> > you mean 240V AC 50HZ and move from 120V 60Hz? (or also 50Hz)
> >
> > 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.
> >
> > Kind regards,
> > Ingo Flaschberger