Electronics > Beginners
How to wire up a 240VAC receptacle
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Spork Schivago:

--- Quote from: IanB on May 20, 2018, 07:39:39 pm ---
--- Quote from: Spork Schivago on May 20, 2018, 07:24:54 pm ---Yes, but even the tech people I talk to say no, it's only for 208VAC.  So it's listed as Single-Phase. Is it possible in the US to get single phase 208VAC?
--- End quote ---

Yes, 208 V AC single phase is a standard supply voltage in commercial premises.


--- Quote from: Spork Schivago on May 20, 2018, 07:29:39 pm ---Maybe modifying the current PDU would be the better way to go. A lot of work, I know, and it'd void warranty, but that just might be the best way to go about it.
--- End quote ---

Bear in mind that if you do that you would have to install a 40 amp circuit to plug it into and you wouldn't have any redundancy. But other than that it might work if fitted with 2-pole breakers.

--- End quote ---

I got a few seconds here, yes, I got the double-pole 40-amp breaker which I can return, if need be.   But I was thinking about what you said, "About the 5 kVA, that's a North American constraint, governed by the NEC."....would modifying the current PDU (which I do like because of the fact that it can handle higher loads) violate the NEC because it'd be using the 40-amp breaker?    I understand that 30-amp breakers the max would be 24-amp.   And I understand why.   But what I was saying was could HPE make a PDU for 240V North America that provides a higher load using something like double-pole 40-amp breakers?   Or is that against NEC?   I can check the NEC when I finish up here.   But once I'm done here, I want to get some work done for my start-up business.
Spork Schivago:

--- Quote from: Gregg on May 20, 2018, 08:11:16 pm ---In a business environment every time you try to save money by not doing something correctly, Murphy’s Law gets reinforced big time.  Granted there are degrees of correctness, but blatant disregard for tried and true power wiring is not recommended. 
Things that you can get away with on the bench for short term testing seldom work out when put in service 24/7 unattended especially when it is your source of income.
You can’t afford pissed off customers, nobody wants a service that’s unreliable (even if it is cheaper than other options).

--- End quote ---

I agree.   But is there really anything wrong with modifying this PDU if they won't accept the return, and then buying the same, modifying that for redundancy, instead of buying something like 6 of the P9S13A's?   When I did a quick price check, the price of those P9S13As where more than the P9S16As.

Once this guy leaves, I'll go through the numbers again, figure out exactly what our load is, what will need to be ran off the PDUs, what won't.   For my workbench, I wanted to purchase a switched and metered PDU (doesn't have to be HPE) that was around 10-foot tall, but I can't seem to find one.   A general power strip I can find.   Right now, that's what I have, just a general power strip.
james_s:
Look on ebay for PDUs, there are tons of perfectly good used ones that are cheap compared to new. It's not like they're something that tends to wear out.
IanB:

--- Quote from: Spork Schivago on May 20, 2018, 09:02:33 pm ---But what I was saying was could HPE make a PDU for 240V North America that provides a higher load using something like double-pole 40-amp breakers?
--- End quote ---

It seems that they could, but they don't. For higher loads they seem to prefer three phase supplies, probably because that is what will be found in data centers. If they made a high power 240 V single phase PDU for North America they would have no sales because no customers would have a need for it.

Your existing P9S16A PDU is designed to handle 32 A and is fitted with two 16 A single pole breakers. If you were to replace the single pole breakers with double pole breakers rated for 16 A continuous, and if you were to plug the PDU into a 40 A 240 V circuit (using 8-gauge wire for the circuit and using plugs rated for 32 A continuous) then I suppose, theoretically, it would work.

But since you would be going off script, you would have to absorb the risk of things going wrong and would void any warranty support.
Gregg:
Now that many of us on this forum have spent countless hours advising Spork about powering his secret project, I would like to make a guess as to what this project might be.

My guess: Spork is turning his basement into a node for a VPN.  If so, his revenue will depend on up time and throughput but the IT administrators want control of things like powering down servers and routing data.  But a power outage won’t be the end of this business model because the customers can be automatically connected via another node.  The VPN saves a ton of money by not needing to be located in expensive data centers plus they have a continuous tech on site.  It could be a nice steady source of income that may grow.  Worst case the VPN goes out of business leaving Spork with a sizeable investment not yet amortized. 

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