Sun Microsystems StorageTek StreamLine SL8500, System Assurance Manual

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Introduction
12 SL8500: Systems Assurance Guide • July 2011 E24254-01
AC Power Options
The SL8500 has four external AC power options:
• 200–240 VAC, line-to-line, three phase, 40 Amps, 50–60 Hz,

Delta: mostly used in the U. S. (One 3-phase input for each system PDU)
• 200–240VAC, line-to-neutral, three phase, 24 Amps, 50–60 Hz,

Wye: mostly used in Europe (One 3-phase input for each system PDU)
• 200–240 VAC, single phase, 24 Amps, 50–60 Hz

Three single-phase inputs are required for each system PDU
Notes: The following notes are highly recommended.
• Connect to three phase power whenever possible.
• Have a licensed electrician connect the external power cables.
Delta or Wye?
From the four external AC power options, which one should the customer
use? The following are guidelines that may help:
• As stated before, connecting to three phase power is highly
recommended .
The single-phase power option requires 3 circuits and uses 6 circuits for a
2N power configuration and redundancy. This power option is provided for
customers that do not have access to three phase power.
• There are two three phase power options to choose from: Delta or Wye.
Delta When the voltage measured from phase-to-phase is 200–240 VAC,

use a Delta power distribution unit.
Delta PDUs require four wires (3-phases plus ground).

If supplied, Delta PDUs do not use neutral (a fifth wire).
Wye When the voltage measured from phase-to-phase is 380–415 VAC,

use a Wye power distribution unit.
Wye PDUs require five wires (3 phases, ground, and neutral).

Neutral (N) is required for Wye PDUs.