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

Good to know, I've only seen 3phase on an IBM PDU once and it was the 5 pin. Sounds like he is going to have to crack it open and count wires.

Coy Krill
Core Processing Team Lead, AVP
Washington Trust Bank

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of James H. H. Lampert via MIDRANGE-L
Sent: Thursday, April 21, 2022 10:54
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Cc: James H. H. Lampert <jamesl@xxxxxxxxxxxxxxxxx>
Subject: Re: rack power 7+ how to tell if 3-phase power


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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