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You'll need to take the cover of the circuit breaker box.

Look at the box's main breaker: 2 non-white wires connected, you have 240V
single phase; 3 non-white wires connected, you have 3 phase. The white wire
is the neutral, it will be connected to a bar within the box to which other
white wires will be connected.

Roy Luce

Direct - 847-910-0884

Email - lwl@xxxxxxxxxxxxx

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jim
Sent: Thursday, April 21, 2022 12:26 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: rack power 7+ how to tell if 3-phase power

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
Is there any definitive clue in this description?
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