6-8 Site Preparation
6 Power Requirements
Is PDU Re-wiring Necessary?
Re-wiring the PDU is necessary only if you are connecting it to a different power
configuration than it was wired for, not merely a different voltage. Delta (3PD) and
Wye (3PY) are equivalent configurations.
See Table 6-2 and the examples below.
Suppose your system’s PDU is wired for 220 volts wye (option 3PY) and you want
to connect it to:
• 208 volts wye (option 3PY)
No re-wiring is necessary; this is merely a voltage change and all internal
components will handle 200 to 240 volts.
• 220 volts delta (option 3PD)
No re-wiring is necessary; options 3PY and 3PD have the same internal wiring.
• 220 volts wye with neutral (opt 3PN)
Re-wiring is necessary because the internal circuits are wired phase-to-phase
and the internal components would experience over-voltage. Whenever you
switch from a non-neutral to a neutral configuration, or vice versa, you must
re-wire the PDU.
1. Regardless of the power option, the internal system components always operate at 200–
240 volts.
If you determine that re-wiring the PDU is necessary, see the PDU Wiring Diagrams.
Table 6-2 Power Options / Configurations
Power Options Configuration Description
1
3PD 200–240 volts 3-phase Delta (50/60Hz)
Includes 200V, 220V, 230V, 240V
3PY 208–220 volts 3-phase Wye (50/60Hz)
Includes 208V, 220V
3PN 380–415 volts 3-phase Wye with Neutral (50/60Hz)
Includes 380V, 400V, 415V
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