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#1
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3 Phase supplies and Compaq cabinets
Hiya all
We are trying to install a 10K series Compaq/Hp cabinet to support an EVA5000 the cab has 2 PDU's is it ok to feed the 2 PDU's from separate phases or will this be a health & safety issue ie the potential difference across the 2 phases could reach 480 volts. any URL's to the info would be appreciated. Regards Trevor |
#2
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Cubzilla,
I'd only use one phase for the entire cabinet for simplicity sake. There's no reason to endanger anyone by trying to power this unit with phase A, and that unit with phase B. :-( Larry Wagar Skagit Media Productions (360) 854-0709 larry at skagitmedia dot com www.skagitmedia.com Featuring: Virtual Tours, Database driven ASP sites, ASP Hosting $8.25 month, 50% off for Non-Profits MLS Real Estate Sites "Cubzilla" wrote in message ... Hiya all We are trying to install a 10K series Compaq/Hp cabinet to support an EVA5000 the cab has 2 PDU's is it ok to feed the 2 PDU's from separate phases or will this be a health & safety issue ie the potential difference across the 2 phases could reach 480 volts. any URL's to the info would be appreciated. Regards Trevor |
#3
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Thanks for that Larry,
The problem is that the customer see's if one phase goes down the other phase SHOULD keep the system going and that the UPS people have hinted that the one phase may not support the 32amp max that the FULLY loaded cab could demand. I'm sure I read a document that covers the safety angle. Regards Trev Cubzilla is my sad on-line game sig "Larry" wrote in message ... Cubzilla, I'd only use one phase for the entire cabinet for simplicity sake. There's no reason to endanger anyone by trying to power this unit with phase A, and that unit with phase B. :-( Larry Wagar Skagit Media Productions (360) 854-0709 larry at skagitmedia dot com www.skagitmedia.com Featuring: Virtual Tours, Database driven ASP sites, ASP Hosting $8.25 month, 50% off for Non-Profits MLS Real Estate Sites "Cubzilla" wrote in message ... Hiya all We are trying to install a 10K series Compaq/Hp cabinet to support an EVA5000 the cab has 2 PDU's is it ok to feed the 2 PDU's from separate phases or will this be a health & safety issue ie the potential difference across the 2 phases could reach 480 volts. any URL's to the info would be appreciated. Regards Trevor |
#4
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The problem is that the customer see's if one phase goes down the other
phase SHOULD keep the system going Very rarely will you lose only one phase. And if one phase is lost a switching device will feed from another phase? This sounds a little extravagant for the very few times it would be used. The conventional setup is a UPS (for power filtering and short outages) and a generator (for long outages). the UPS people have hinted that the one phase may not support the 32amp max that the FULLY loaded cab could demand. Then run 3 phase power into the cabinet. Just make sure all wiring is clearly labeled. (¯`·._.· £ãrrÿ ·._.·´¯) "Cubzilla" wrote in message ... Thanks for that Larry, The problem is that the customer see's if one phase goes down the other phase SHOULD keep the system going and that the UPS people have hinted that the one phase may not support the 32amp max that the FULLY loaded cab could demand. I'm sure I read a document that covers the safety angle. Regards Trev Cubzilla is my sad on-line game sig "Larry" wrote in message ... Cubzilla, I'd only use one phase for the entire cabinet for simplicity sake. There's no reason to endanger anyone by trying to power this unit with phase A, and that unit with phase B. :-( Larry Wagar Skagit Media Productions (360) 854-0709 larry at skagitmedia dot com www.skagitmedia.com Featuring: Virtual Tours, Database driven ASP sites, ASP Hosting $8.25 month, 50% off for Non-Profits MLS Real Estate Sites "Cubzilla" wrote in message ... Hiya all We are trying to install a 10K series Compaq/Hp cabinet to support an EVA5000 the cab has 2 PDU's is it ok to feed the 2 PDU's from separate phases or will this be a health & safety issue ie the potential difference across the 2 phases could reach 480 volts. any URL's to the info would be appreciated. Regards Trevor |
#5
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" Very rarely will you lose only one phase. And if one phase is lost a switching device will feed from another phase? The equipment in the cab ALL have dual power supplies that receive power simultaneously. The supplies are connected to both of the PDU's if half the power fails the supply to the other half is already there and the kit can function correctly (from one PDU). Then run 3 phase power into the cabinet. Just make sure all wiring is clearly labeled. The kit (PDU's) have a single phase cables coming out of them the cab is not designed for 3 phase, the "tails" from the PDU go under the floor to the power distribution from the UPS Thanks anyway Larry |
#6
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"Cubzilla" wrote in message
... | Hiya all | | We are trying to install a 10K series Compaq/Hp cabinet to support an | EVA5000 the cab has 2 PDU's is it ok to feed the 2 PDU's from separate | phases or will this be a health & safety issue ie the potential difference | across the 2 phases could reach 480 volts. | | | any URL's to the info would be appreciated. | | See ftp://ftp.compaq.com/pub/products/se...wercooling.pdf Among others: page 8: "HP recommends providing two 30-amp 208/230 single-phase circuits per rack. Future high-density server environments may require up to two 50-amp circuits per rack. Although racks of equipment currently use single-phase power, it may be necessary to switch to three-phase power or higher amperage as technology changes. Customers should consider three-phase power when: • the load exceeds 6 kVA • a centrally-managed UPS solution is needed • a single UPS solution to support the entire datacenter is warranted Rack manufacturers provide wattage and BTU information in their product specifications. For precise facilities planning, HP provides a ProLiant Class, Rack/Site Installation Preparation Utility, accessible from the Active Answers web page. This utility includes a Power Calculator for each ProLiant server (Figure 7). ProLiant Power Calculators are macro-driven Microsoft Excel spreadsheets developed for two purposes: • to review server loading to determine the number of power supplies required to provide redundant power supplies, and • to approximate the electrical and heat load per server for facilities planning." etc etc |
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