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

--- Quote from: Bratster on May 17, 2018, 01:24:30 am ---IMHO while I think you could install this with minimal problems you really should get an electrical engineer or commercial electrician that is familiar with something along these lines to have a plan drawn up and run it past your electrical inspector for the city and make sure everything will be okay.

You seem very concerned with security and Audits and having it done as right as it can be and all of that stuff;
 so having this planned out by a professional and approved by the inspector before you start doing things would be highly important. IMO

I would bet your insurance is going to absolutely require that.



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--- End quote ---

Yes, even though I'll be installing it, I'm going to be running it by professionals before I actually even touch anything.   It's out of my league a bit, and I will learn, but because of the dangers involved, I have no choice but to run it by professionals first.   Heck, I'm still having a hard enough time trying to understand how to wire it properly to begin with.   I will not take chances and just randomly guess or say yeah, I think this is right.   I just thought that was assumed, but yeah, that's the plan and was from the git go.   I might be able to get the company in my city that I'm working with to send one of their guys over, I dunno.   But I still want to wire it up, I don't want them doing it for me.   I just need them to double check everything and make sure it's correct before I go to the city, and watch me while I'm wiring it up, to make sure I don't make any horrible mistakes.
Spork Schivago:

--- Quote from: Gregg on May 17, 2018, 03:39:52 am ---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.

--- End quote ---

I appreciate the suggestion again for the P9S13A, but as Mr. Crowley had previously stated (which I was unaware of), these PDUs put out what they're fed.   So if they're fed a split-phase 120VAC - 0 - 120VAC source, they're going to output a split-phase 120VAC - 0 - 120VAC source, thus, we would not be able to use it.   We would still need the 240VAC - 0 - 0 for the PSUs (Power Supplies) that are in the servers.   If that makes since to you.   Unless I am misunderstanding something, and the P9S13A can actually provide single phase 240VAC on the output....
Spork Schivago:

--- Quote from: Richard Crowley on May 17, 2018, 03:58:35 am ---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.

--- End quote ---

It's not like we actually just randomly picked a PDU Mr. Crowley.   We had a power assessment done for the server and where told we could only power our servers with one model PSU, which is 240VAC single-phase.    Then, after that, the HPE technicians found a suitable PDU for our rack environment.   I let those people make the decisions like that, so if something goes wrong, it falls back on them, not me.    But according to them, anything less than 1400 watt, our servers aren't going to power on at all with the hardware that we have in there.   And for the PSU, there was only one choice they provided us with, which expects the 1-phase 240VAC.    I mean, to use a split-phase service, we'd have to ditch some hardware, or go through another company.

We cannot mix and match equipment either, or it voids the warranty.   I don't necessarily mean we cannot go for a PDU made by a different company, but because we have HPE servers, we need to use HPE RAM, HPE Power Supplies.   If we don't, and something breaks, even if it's not related to us using something that isn't HPE branded, they will use that as an excuse to not warrant the hardware.   (one of those, oh, we see you're using non-qualified power supplies.   We're not going to replace your broken really expensive CPUs because you used unapproved PSUs.   For all we know, those PSUs killed your CPUs).
Spork Schivago:

--- Quote from: Richard Crowley on May 17, 2018, 07:23:55 pm ---
--- Quote from: C on May 17, 2018, 06:23:59 pm ---Actually Split-phase can be safer.
--- End quote ---
Yes, that all may be true, but none of it is beneficial (or even relevant) to the specific case at hand.
Bottom line: The PDU appears to be designed to have Neutral = ground and connecting split-phase to it is dangerous.

--- End quote ---
And would be not only dangerous, but wouldn't work.   The equipment that the PDU powers is designed to run off 1-phase 240VAC.   Now, if we were to hook up some workstations (not desktop's, but actual workstations), they might be designed to run off split-phase or even 120VAC.   The switch is made to run off single phase (either 120VAC or 240VAC) but not split-phase 120VAC - 0 - 120VAC.   I don't know if it'd turn on at all if we tried, but it isn't right.

Then the servers themselves, as we verified once again, are designed for single phase 240VAC but learned they won't even power on if we attempt to feed them split-phase.   This is probably a safety feature.

I don't like using a 240VAC transformer anymore than some of you guys, but I don't see any other options here, unless we ditch all the money we've invested in all this very expensive equipment and go for another vendor, but chances are even then, we'll need the single phase 240VAC.    Unfortunately, when you're dealing with equipment that requires a lot of power and is commercial grade, there aren't too many options.   It was hard enough just finding stuff that wasn't designed for 3-phase.   Most of the stuff was for 3-phase.   It would have been easier, but much, much, much more expensive, to have 3-phase ran to the house, and then purchase the 3-phase equipment.
Monkeh:

--- Quote from: Spork Schivago on May 18, 2018, 01:46:26 am ---Then the servers themselves, as we verified once again, are designed for single phase 240VAC but learned they won't even power on if we attempt to feed them split-phase.   This is probably a safety feature.
--- End quote ---

This seems unlikely. There's no safety benefit.
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