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

--- Quote from: Spork Schivago on May 20, 2018, 06:52:06 pm ---See, I see things like 208V NA/JP with an L6-30P .  That's gotta be a typo.  It's single-phase.  That must be a 240VAC North American one.  But load capacity is only 5KVA.  We're already over that.
--- End quote ---

Why has it got to be a typo? I don't follow.

About the 5 kVA, that's a North American constraint, governed by the NEC.

If you have a 30 amp circuit the maximum continuous load permitted by the breaker and by the L6-30P is 24 amps. Now 208 V times 24 A is 5 kVA. That's the limit on one circuit, and since you would want one PDU per circuit, that's the limit on one PDU. (Since you have a 240 V supply the limit goes up to 5.7 kVA, but that's still your limit.)

So if your total system load is more than 5 kVA or so, then you need two or more 30 A circuits, and two or more PDUs. That's not only for redundancy, it is also an outcome of the National Electrical Code.

In summary, you can't put 7 or 8 kVA on one PDU, and neither would you want to.

Spork Schivago:

--- Quote from: IanB on May 20, 2018, 07:01:32 pm ---It looks like the P9S15A is the only single phase option for switched and metered, and it is vertical mounting. It also only says on the specifications "200-208 V input". It doesn't say "200-240 V input". I do not know if 240 V would be a problem for it. HPE technical consultants would have to tell you the answer to that. If you talk to a salesperson they are likely to cover their ass and say "no"...

--- End quote ---

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?   The tech documents for that PDU give the specs at what voltages it runs at and I think the max where 220VAC, so I don't think it's a typo there.   Don't quote me on the tech documents.   I'll have to check, but I got one of those co-workers here now and I gotta go and have him double check some of my work.   I'll be back later though.
Spork Schivago:

--- Quote from: IanB on May 20, 2018, 07:09:55 pm ---
--- Quote from: Spork Schivago on May 20, 2018, 06:52:06 pm ---See, I see things like 208V NA/JP with an L6-30P .  That's gotta be a typo.  It's single-phase.  That must be a 240VAC North American one.  But load capacity is only 5KVA.  We're already over that.
--- End quote ---

Why has it got to be a typo? I don't follow.

About the 5 kVA, that's a North American constraint, governed by the NEC.

If you have a 30 amp circuit the maximum continuous load permitted by the breaker and by the L6-30P is 24 amps. Now 208 V times 24 A is 5 kVA. That's the limit on one circuit, and since you would want one PDU per circuit, that's the limit on one PDU. (Since you have a 240 V supply the limit goes up to 5.7 kVA, but that's still your limit.)

So if your total system load is more than 5 kVA or so, then you need two or more 30 A circuits, and two or more PDUs. That's not only for redundancy, it is also an outcome of the National Electrical Code.

In summary, you can't put 7 or 8 kVA on one PDU, and neither would you want to.

--- End quote ---

The typo thing was a mistake by  me.   I didn't realize you didn't have to use all three-phases with three phase, so there's still stuff I'm learning about AC, which is good.   Well, this really sucks then, because I'm going to have to spend a lot of the cash I just made on 5KVA Switched PDUs.    Enough to cover my load, and then enough for redundancy <sigh>.   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.

I really gotta go though.   I'll be back later.
IanB:

--- 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.
Gregg:
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).
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