Electronics > Beginners
How to wire up a 240VAC receptacle
Spork Schivago:
--- Quote from: Bratster on May 15, 2018, 04:48:45 am ---He has already given the model of the device twice, it's a rack mount power distribution unit.
HPE P9S16A PDU
I think that is the elephant in the room that's not being talked about, will this device still be safe if it is fed two Lines as opposed to a line and a neutral.
With the OP so concerned about changing the plug voiding the warranty, I think he is missing the bigger issue, will feeding this pdu two lines void the warranty?
And besides that will it even be safe?
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Changing the plug, again, doesn't fix the problem. The cord still only has three wires, just like the plug. However, you bring up a valid point, and I will call HPE to double check that this unit is truly meant to be used in the USA. I have noticed, depending on who you talk to at some of these larger companies, you're given conflicting information. In the beginning, a Microsoft Sales rep said we could just use Windows Home editions to run the business! That's a no. Now, Microsoft and a Microsoft reseller are fighting over whether we can legally have Windows 10 Enterprise E3 with the Cloud Service Provider agreement installed on the local workstations / servers or if they need to be hosted somewheres not on-premise. We're currently going with what the reseller said, and hopefully he's right. But multiple times, Microsoft, as one, has provided us with conflicting information, depending on who we've talked to. Calling HPE is just a phone call. Doesn't hurt to double check.
To properly replace the plug, I'd have to open the unit, which will void warranty, and replace the actual cord as well as the plug. If that's the only way to keep it up to code, to keep it safe, I would rather void the warranty and do that than risk burning the house down. Our options for HPE PDUs are limited to literally only this one, with the features that feel we _need_. There was one we wanted, that had extra features, but they only made it in three-phase. After talking to the professional electrician, it would cost over 50,000$ to run 3-phase to our house (which I think is kinda B.S., personally, but eh). He says there's no 3-phase on our street. I'm not an expert on power lines, but to me, the pole out back really looks like three-phase. I can upload pics of that.
3-phase would cost money, but would open the doors a bit for us. But then we'd have to send back all the PSUs and order 3-phase ones, and that opens a whole nother can of worms.
Monkeh:
--- Quote from: Spork Schivago on May 15, 2018, 07:14:07 pm ---Replacing the plug itself puts us in the same predicament that we're in now. That plug only has three pins, therefore, it only has three wires inside running to those three pins.
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Which is fine, if it were suited to split-phase supply, because you could just put a NEMA plug on and use a normal NEMA socket, and off you go.
--- Quote ---It's not like I can just through a NEMA twist-and-lock plug on there and wire it up properly. The wire itself would be what would limit us. So, the only way to really properly put a NEMA twist-and-lock plug on it or something similar, would be to tear the unit apart and see how they have the actual cable wired up, and see if I can wire it differently, where it accepts two 120VAC's, but from reading everyone's responses, it seems that it might already be wired like that. 240VAC going down the L/+ pin, or 120VAC going down the L/+ pin, 120VAC going down the Neutral pin.
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It is not wired like that. It almost certainly only has single pole breakers - this is not suitable for a split-phase system.
You cannot use this PDU safely with a split-phase supply. If 240V operation is desired you will need to use smaller PDUs which do not require additional protection, obtain a single-phase 208V or 240V supply, or use a transformer to provide such (this is a not inexpensive lump of iron..).
Spork Schivago:
--- Quote from: Monkeh on May 15, 2018, 06:54:29 pm ---It can be used in the USA - on a single phase 208V supply. Not a split-phase 240V one, preferably.
--- Quote ---The plug it's using is common over there, the built-in breakers show the derated values of the breakers, the plug itself shows the derated value of the plug (breakers shouldn't continuously handle a load more than 80% of what they're rated for, that 80% is called the derated value, and everything here shows the derated value (80% of 20 is 16, 80% of 40 is 32. The two breakers both show 16-Amp, the plug shows 32-Amp)).
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Bollocks. That's the American approach to breakers and that is not how they are rated in the rest of the world. A 16A breaker carries 16A continuous. A 32A plug handles 32A continuous. Those are not deratings, they are ratings.
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Let me reword it a bit. Over in Europe, a 32A breaker is equivalent to our North American 40-Amp breakers. Does that sense?
Here's an article I just googled that explains it better than I can. Give it a read and let me know what you think.
http://www.raritan.com/blog/detail/rack-pdu-power-rating-vs.-load-capacity
Monkeh:
--- Quote from: Spork Schivago on May 15, 2018, 07:30:03 pm ---
--- Quote from: Monkeh on May 15, 2018, 06:54:29 pm ---It can be used in the USA - on a single phase 208V supply. Not a split-phase 240V one, preferably.
--- Quote ---The plug it's using is common over there, the built-in breakers show the derated values of the breakers, the plug itself shows the derated value of the plug (breakers shouldn't continuously handle a load more than 80% of what they're rated for, that 80% is called the derated value, and everything here shows the derated value (80% of 20 is 16, 80% of 40 is 32. The two breakers both show 16-Amp, the plug shows 32-Amp)).
--- End quote ---
Bollocks. That's the American approach to breakers and that is not how they are rated in the rest of the world. A 16A breaker carries 16A continuous. A 32A plug handles 32A continuous. Those are not deratings, they are ratings.
--- End quote ---
Let me reword it a bit. Over in Europe, a 32A breaker is equivalent to our North American 40-Amp breakers. Does that sense?
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Not really, no, because trip characteristics don't necessarily work like that. But it doesn't matter anyway.
Richard Crowley:
You could have your electrician wire one of these into the circuit that you install for PDU.
This will provide a true single-phase (neutral at ground-potential) 240V power circuit.
* Input Voltage: 240/480VAC
* Output Voltage: 120/240VAC
* VA Rating: 7.5KVA
* $605.49 /EA
* Item ships from Zoro in 1 business day.
This item ships FREE
https://www.zoro.com/acme-electric-transformer-75kva-120240v-wall-t2535153s/i/G2253343/#specifications
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