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| How to wire up a 240VAC receptacle |
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| Gregg:
Mr. Crowley certainly has more patience than I. When stated that --- Quote ---“None of the HPE PDU are designed to handle split-phase. They are all designed for schemes where Neutral = Ground.” --- End quote --- I believe He may have overlooked the P9S13A, as I previously posted, states it is for North America and Japan as it is rated for 200 -240V, uses a standard L6-30P plug (208-240V 3 pole twist lock labeled L1, L2 and Ground in the USA) and it has 2ea 2pole 20a breakers, one for each level of the PDU. It also has the exact same receptacles as the one chosen by Spork. I’m not trying to rag on Mr. Crowley here, but I still think two of the P9S13A deserve more consideration especially since Spork has stated that he may expand his power requirements. It would eliminate the need for a transformer unless his servers specifically need a grounded neutral which is very doubtful for SMPS typical server power supplies. Bratster’s drawing is a fine example of how to install a transformer; with the breaker panel on the output and proper breakers installed I believe it would pass any reasonable inspection. However there are inspectors out there that kind of make up their own rules. |
| Richard Crowley:
Certainly Spork would be better off with something he can connect directly to his split-phase domestic service as @Gregg observes. It seems unfortunate that he selected that particular PDU. The "documentation" provided by HPE leaves a great deal to the imagination from lack of useful details. |
| Gregg:
--- Quote from: Richard Crowley on May 17, 2018, 03:36:42 am --- --- Quote from: Teledog on May 17, 2018, 02:34:28 am ---Kitchen outlets/receptacles, if done to most American codes, have alternating hot lines, above & below on each outlet (hence the center breakaway tab on the receptacle line connections) --- End quote --- Can you cite an authoritative reference for that? In 70 years I have never seen (or even heard of) such an extraordinary thing. Even if it is everything as claimed, while it might be suitable for some random domestic applications, it is certainly not up to the task of operating a rack full of heavy-duty servers. Not if reliability means anything to you. --- End quote --- NEC article 210.4 allows the use of two circuits to the same receptacle and even allows sharing the return. Enclosed is s can from the 2005 NEC handbook I suggest that Spork buy an older copy of the NEC handbook on ebay, study it and keep it for future reference. They don't change much between editions so a 2005 (big yellow book) or a 2008 (big blue book) or a 2011 (big red book) by the NFPA National Fire Protection Association (not by anyone else) will probably suffice |
| Gregg:
Here is an example of a proper PDU being installed. Input is 480V 3ph from one of two redundant 400KVA UPS units backed up by two redundant utility services and two 2MW V16 Caterpillar generators. Output is two panels of 42 breakers and 225a 208/120V input each. The branch wires go through small current transformers near each breaker. There are two grounds, the green and yellow is isolated all the way back to the data center’s ground ring; the green are tied to the PDU chassis, transformer neutral and back to the UPS ground, which in turn eventually goes back to the main ground ring. Data centers are very complicated in order to attempt zero down time. |
| C:
One thing When you buy computer equipment in the USA and it states that is it 220-240 Volt. There is a good chance that it is built for the USA standards. With most businesses having 220-240 split phase power, would be a huge loss of sales not to support this. Very easy for a computer company to make a computer power supply that works with standard 220-240 split phase power source. C |
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