nanog mailing list archives
RE: Why choose 120 volts?
From: "Dave Larter" <dave () stayonline com>
Date: Wed, 27 May 2009 18:39:37 -0400
The ground is not supposed to carry any current where as the neutral is. If you tried to carry current on the ground of a CGFI protected circuit it would trip. -----Original Message----- From: david raistrick [mailto:drais () icantclick org] Sent: Wednesday, May 27, 2009 6:30 PM To: Seth Mattinen Cc: nanog () nanog org Subject: Re: Why choose 120 volts? On Wed, 27 May 2009, Seth Mattinen wrote:
Here's the L-G voltage off the 208v taps from an isolation transformer
in a
system with no neutral: http://ninjamonkey.us/not_120_volts.jpg
Not 120, but 90 give or take. 90 is at the low end of the acceptable range for common household 110/120v service. Depending on how the phases are balanced in your facility, you may see that fluctuate up or down, of course. If you measure hot to hot on the same PDU, do you get anywhere close to 208? I'm going to suspect either your fairly out of balance, or you've got a good bit of voltage drop by the time it arrives.... But since the concensus from those who haven't used this is that the device will present 208/240 at the 5-15 plug, I withdraw my suggestion and leave you to your own methods. (for the rest, test it yourself) I also won't argue using ground for neutral, that's like arguing bonded vs unbonded panels. --- david raistrick http://www.netmeister.org/news/learn2quote.html drais () icantclick org http://www.expita.com/nomime.html
Current thread:
- Re: Why choose 120 volts?, (continued)
- Re: Why choose 120 volts? Joe Greco (May 26)
- Re: Why choose 120 volts? david raistrick (May 27)
- RE: Why choose 120 volts? Dave Larter (May 27)
- Re: Why choose 120 volts? Joe Greco (May 27)
- Re: Why choose 120 volts? Pete Templin (May 28)
- RE: Why choose 120 volts? Dave Larter (May 28)
- Re: Why choose 120 volts? Jay Hennigan (May 28)
- Re: Why choose 120 volts? Jay Hennigan (May 27)
- Re: Why choose 120 volts? Seth Mattinen (May 27)
- Re: Why choose 120 volts? david raistrick (May 27)
- RE: Why choose 120 volts? Dave Larter (May 27)
- Re: Why choose 120 volts? Joe Greco (May 27)
- Re: Why choose 120 volts? Joe Greco (May 27)
- Re: Why choose 120 volts? david raistrick (May 27)
- Re: Why choose 120 volts? Chuck Anderson (May 27)
- Re: Why choose 120 volts? Ricky Beam (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)