nanog mailing list archives
Re: Want to move to all 208V for server racks
From: Lamar Owen <lowen () pari edu>
Date: Thu, 2 Dec 2010 12:58:56 -0500
On Thursday, December 02, 2010 11:46:28 am Leo Bicknell wrote:
You may also find this arrangement in larger multi-tennent buildings where they are fed with 3-phase power.
There are two other 3 phase setups that are somewhat common. 120/240V delta (has the third leg 'wild' at 208V to neutral, with the neutral (grounded conductor in NEC parlance) connected to a centertap on one transformer of the three required). This one has special labeling requirements and a prohibition on single-phase loads being connected to the 208V leg. This one is sometimes provided in a two-transformer 'open delta' arrangement (instead of the correct three-transformer 'closed delta') and is, you might say, 'three phase lite' in practice. 480V delta corner ground. This one is 480V three phase on three wires; one phase is grounded at the service entrance, and the other two phases are 480V to ground. This one also has special labeling requirements and no 'neutral' in the conventional sense.
Current thread:
- Re: Want to move to all 208V for server racks, (continued)
- Re: Want to move to all 208V for server racks Gary Buhrmaster (Dec 03)
- Re: Want to move to all 208V for server racks Gary Buhrmaster (Dec 03)
- Re: Want to move to all 208V for server racks Jay Ashworth (Dec 03)
- Re: Want to move to all 208V for server racks Leo Bicknell (Dec 03)
- Re: Want to move to all 208V for server racks Ingo Flaschberger (Dec 03)
- RE: Want to move to all 208V for server racks Alex Rubenstein (Dec 03)
- Re: Want to move to all 208V for server racks Gary Buhrmaster (Dec 02)
- RE: Want to move to all 208V for server racks John van Oppen (Dec 02)
- RE: Want to move to all 208V for server racks Ingo Flaschberger (Dec 02)
- Re: Want to move to all 208V for server racks Lamar Owen (Dec 02)
- Re: Want to move to all 208V for server racks Lamar Owen (Dec 02)
- Re: Want to move to all 208V for server racks Justin M. Streiner (Dec 02)
- Re: Want to move to all 208V for server racks Seth Mattinen (Dec 02)
- Re: Want to move to all 208V for server racks Chuck Anderson (Dec 02)
- Re: Want to move to all 208V for server racks Gary Buhrmaster (Dec 03)