Re: rack power 7+ how to tell if 3-phase power

Most 30amp PDUs sold in the US use L630 plugs so it should be a quite a bit easier than they make it out to be. 20amp usually use L5s.

Jim Oberholtzer
Agile Technology Architects

On Apr 21, 2022, at 2:23 PM, Rob Berendt <rob@xxxxxxxxx> wrote:

I think I agree with Jim here. Changing data centers is now the time to get it right.



Rob Berendt
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jim Oberholtzer
Sent: Thursday, April 21, 2022 3:17 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: rack power 7+ how to tell if 3-phase power

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I’d just tell them you need 208/240 volt single phase, or when the system smokes, the just bought a new one. As to looking in the panel, aside from being more dangerous than reasonable and you might not recognize what you see, get an electrician in to check it.

The small amount of money you spend on professionals to give you the right answer, safely is more than worth it. (Insurance would also insist on that)

Jim Oberholtzer
Agile Technology Architects

On Apr 21, 2022, at 1:26 PM, Rob Berendt <rob@xxxxxxxxx> wrote:

Might be easier to replace the pdu.
Or to change the cable which goes from the PDU. Doesn't it untwist from the PDU also?


Rob Berendt
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IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
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Ft. Wayne, IN 46818
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Ft. Wayne, IN 46818
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jim Franz
Sent: Thursday, April 21, 2022 2:08 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: rack power 7+ how to tell if 3-phase power

CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.


what you all are saying, is that it's up to how wired in receptacle box?
i see rack has two Liebert MPH PDU's, one for each power supply , with
further reading it appears the pdu will handle either single or 3 phase.
But new data center is going to have to match receptacle plug type.

On Thu, Apr 21, 2022 at 1:53 PM James H. H. Lampert via MIDRANGE-L <
midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

On 4/21/22 10:44 AM, Krill, Coy via MIDRANGE-L wrote:
Pull the plug out. 3phase will have 5 pins and single phase will have 3.

Actually, it may only have 4 pins (as does single-phase 240VAC with a
neutral).

At the Printing Museum (https://www.printmuseum.org), we've standardized
on a specific size and configuration of 4-pin twist-lock 3-phase plugs
for our 240V plugs and sockets, even if we're plugging in single-phase
equipment.

(I spend my Saturdays docenting there; it was because I'm a programmer
by trade that I was the first one there to realize that the notches at
the top of a Linotype matrix form a binary code.)
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JHHL
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