rack power 7+ how to tell if 3-phase power -- MIDRANGE-L

Subject: rack power 7+ how to tell if 3-phase power
From: Jim Franz <franz9000@xxxxxxxxx>
Date: Thu, 21 Apr 2022 13:25:33 -0400
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Am a pgmr, not an electrician - moving system to different data center.
Existing center - no one remembers.
All i can see is the rack power connect to a metal boxes, big round plugs
(redundant power supply), with label "240V" on breaker. Other site asking
if 3 phase or single phase. They don't want to pay for an electrician to
come onsite.
Is there any definitive clue in this description?
Jim

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Follow-Ups:

RE: rack power 7+ how to tell if 3-phase power , Krill, Coy
Re: rack power 7+ how to tell if 3-phase power , Patrik Schindler
RE: rack power 7+ how to tell if 3-phase power , Rob Berendt
RE: rack power 7+ how to tell if 3-phase power , Roy Luce - Long Pier Solutions

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