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#204296 - 11/27/11 09:45 PM What NEMA receptacle to use  
pdh  Offline
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Joined: Jan 2005
Posts: 354
In USA for a data center, power is to be provided at the (unusual for USA) voltage of 416Y/240 at 60 Hz. Circuits will be single phase, probably 20 or 30 amps though I have heard of even 60 amps being used for high density blade systems, supplying a rack cabinet (optionally with a UPS ordinarily intended for 230 volts at 50 Hz, but specified as supporting 240 volts at 60 Hz, too). Some USA equipment makers are already recognizing that a number of data centers in USA are operating equipment with this type of system. PDUs are already made for this system, as well, and have IEC 60320 plugs, inlets, and receptacles. However, all the UPSes I have seen for this are hardwired.

So here's an idea. Instead of wiring the UPS to a junction box, how about wiring a cord and plug to the UPS and plug it into a wall outlet? The question I have is what type of plug and receptacle would be appropriate in USA?

Would the appropriate NEMA plug be (L)6-xxP or (L)7-xxP (for xx amps)? Since 6-xxR is normally expected to have 120 volts relative to ground on both conductors, would it be safe to wire it with a neutral and 240 volts relative to ground? I don't see anything in the code that specifies this (I looked in 2008 edition). What about 7-xxR which is normally 277 volts L-N, where equipment being plugged in could potentially be damaged with the 15% higher voltage should there happen to be a real 277 volt receptacle somewhere?

Other possible options might include: C13 or C19 (from IEC 60320) or one of the alternate national receptacle types (CEE 7/4, AS/NZS 3112, etc), or IEC 60309 types, where acceptably listed versions are available. I've looked for C14 and C20 receptacles in a wall mount form factor, but have yet to see one.

If you had a job to install 20 amp single phase wall receptacles for a bunch of computer rack cabinets, and the particular receptacle type was not specified, although the electrical system type is known to be single phase branches from 416Y/240, what would you install?


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#204297 - 11/27/11 10:16 PM Re: What NEMA receptacle to use [Re: pdh]  
renosteinke  Offline
Cat Servant
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Joined: Jan 2005
Posts: 5,316
Blue Collar Country
You're not required to use a NEMA pattern! What you ARE required to do is use equipment that can handle the use, and cannot be confused with other systems in the same building.

To that end, there are quite a few private brands out there ... Meltric, Amphenol, etc. I'd find out what the local supply house carries, and try to conform to that.


#204298 - 11/27/11 11:26 PM Re: What NEMA receptacle to use [Re: pdh]  
pdh  Offline
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Joined: Jan 2005
Posts: 354
I'm putting together specifications and plans and don't know where the data center will be. Do you know of any web sites that would sell this?


#204303 - 11/28/11 12:18 AM Re: What NEMA receptacle to use [Re: pdh]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,126
Estero,Fl,usa
Contact the Installation Planning Rep for the hardware vendor. He should be able to give you the list of plug caps for the ordered equipment.
When I was in the business Russell Stoll was the normal plug in the mainframe arena but IEC309 was rapidly taking hold.
The smaller rack machines like AS/400 used L6-xxR pretty much universally.


Greg Fretwell

#204305 - 11/28/11 02:36 AM Re: What NEMA receptacle to use [Re: pdh]  
NORCAL  Offline
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Joined: Sep 2002
Posts: 873
There is a IEC pin & sleeve configuration for that voltage, check the Hubbell website to find the catalog #'s...


#204313 - 11/28/11 03:38 PM Re: What NEMA receptacle to use [Re: pdh]  
pdh  Offline
Member
Joined: Jan 2005
Posts: 354
Another UPS I am looking at using has a C20 inlet, and comes with a Schuko to C19 cord. But I could replace that with a 6-20P to C19 cord.


#204333 - 11/29/11 10:11 PM Re: What NEMA receptacle to use [Re: pdh]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
380Y220 is a classic Japanese set up, so you may be building for an Hitachi system.



Tesla

#204342 - 12/01/11 01:39 PM Re: What NEMA receptacle to use [Re: Tesla]  
Texas_Ranger  Offline
Member
Joined: Dec 2001
Posts: 2,402
Vienna, Austria
Originally Posted by Tesla
380Y220 is a classic Japanese set up, so you may be building for an Hitachi system.


Seriously? Sounds a lot more European to me. I thought Japan usued 100/200V 1ph or something in that area for most equipment.


#204344 - 12/01/11 04:11 PM Re: What NEMA receptacle to use [Re: pdh]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,126
Estero,Fl,usa
I think the 100/200 is just a generic term for 120/240 and all the variance we see in those nominal voltage ranges.
I know we had a lot of equipment marked that way and the actual stated voltage range was 95v-130v or something for the "100" switch setting. The "wide mouth" switcher power supplies are pretty forgiving on the input side.


Greg Fretwell

#204356 - 12/02/11 09:54 AM Re: What NEMA receptacle to use [Re: Tesla]  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,262
Fullerton, CA USA
Originally Posted by Tesla
380Y220 is a classic Japanese set up, so you may be building for an Hitachi system.



The OP said this was a 416Y/240 system.

Texas Ranger is correct. Japan's voltage is 200/100 1, and 200V 3.

http://www.inverter-china.com/blog/...e-phase-voltage-frequency-and-wires.html


.


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