nanog mailing list archives
Re: Why choose 120 volts?
From: Paul Vixie <vixie () isc org>
Date: Wed, 27 May 2009 00:32:54 +0000
Leo Bicknell <bicknell () ufp org> writes:
... http://www.apcmedia.com/salestools/NRAN-6CN8PK_R0_EN.pdf ... But what you'll find in the paper is that the change allows you to re-architect the power plant in a way that saves you money on PDU's, transformers, and other stuff. Thus this makes the most sense to consider in a green field deployment.
noting also that "architect" is a noun, i find that on large plants the cost of copper wire and circuit breakers add up, where sizes (and prices) are based on ampherage not wattage. in the old days when a rack needed 6kW, that was 208V 30A (10 gauge wire) or it was two of 120V 30A (also 10 gauge wire). somewhere near the first hundred or so racks, the price of the wire and breakers starts to seem high, and very much worth halving. once in a while some crashcart CRT monitor won't run on anything but 120V but for $50 NRC it can be replaced with an LCD. everything else that's still worth plugging in (that is, having a power/heat cost per performance better than that of a blow dryer) doesn't care what voltage it lives on. -- Paul Vixie KI6YSY
Current thread:
- Re: Why choose 120 volts?, (continued)
- Re: Why choose 120 volts? Ricky Beam (May 26)
- RE: Why choose 120 volts? Aaron Wendel (May 26)
- Re: Why choose 120 volts? Jay Hennigan (May 26)
- Re: Why choose 120 volts? Matthew Moyle-Croft (May 26)
- Re: Why choose 120 volts? Leen Besselink (May 28)
- RE: Why choose 120 volts? Warren Bailey (May 28)
- Re: Why choose 120 volts? Seth Mattinen (May 28)
- Re: Why choose 120 volts? Jay Hennigan (May 26)
- Re: Why choose 120 volts? Paul Vixie (May 26)
- Re: Why choose 120 volts? Ricky Beam (May 26)
- Re: Why choose 120 volts? Ronald Cotoni (May 28)