Why choose 120 volts? When DC will do

John Lee john at internetassociatesllc.com
Tue May 26 15:56:42 CDT 2009

What is all this talk about AC. Real data centers use DC. 

John (ISDN) Lee
From: Seth Mattinen [sethm at rollernet.us]
Sent: Tuesday, May 26, 2009 3:39 PM
To: nanog at nanog.org
Subject: Why choose 120 volts?

I have a pure curiosity question for the NANOG crowd here. If you run
your facility/datacenter/cage/rack on 120 volts, why?

I've been running my facility at 208 for years because I can get away
with lower amperage circuits. I'm curious about the reasons for using
high-amp 120 volt circuits to drive racks of equipment instead of
low-amp 208 or 240 volt circuits.


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