Want to move to all 208V for server racks

Thu Dec 2 16:38:22 UTC 2010

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