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C
10
HAPTER
System Power
Power Distribution Units
Each power distribution unit (PDU) must be attached to a dedicated facility
circuit.
Each Oracle FS System component (Pilots, Controllers, and Drive Enclosures)
must have its power supplies connected to separate PDU circuits to ensure
complete redundancy of power.
The PDUs used in a not-racked Oracle FS System installation must provide
redundancy for both external AC power source and internal AC power
distribution to the components. The PDUs must provide sufficient current to
meet the sum of the requirements for the Oracle FS System components.
Oracle PDUs might be purchased for use with non-Oracle racks. The Oracle FS
System component power cords have been designed to work with vertical style
Oracle or third party PDUs. Non-Oracle PDUs must be compatible with Oracle
component power cord lengths and plug types. Non-Oracle PDUs must be
mounted in a manner such that the power cords provided by Oracle might be
used and the PDUs do not obstruct the ability to replace field replaceable units
(FRUs) and customer serviceable units (CRUs).
While planning rack-space, ensure that adequate space is also allocated for the
PDUs, if using non-Oracle PDUs.
PDU Outlet Amperage Ratings
Plug in the Oracle FS System components (Pilots, Controllers, and Drive
Enclosures), into the PDUs so that they do not exceed the amperage rating of any
outlet group. Exceeding the amperage rating, can trip the circuit breakers.
The requirements of Underwriters Laboratories (UL) limit the power draw to
approximately 80% of the circuit breaker rating. For example: In the United
States where the voltage supply is at 240V, the power in a 30A circuit is 24A.
Thus the power available for use is 80% of the total amperage rating of the
circuit. The International Electrotechnical Commission (IEC) uses a system where
the exact available power is listed as the circuit breaker rating. For example: In
Europe, where the voltage supply is at 230V, the power in a 24A circuit is 24A.
For data centers with an input main power of 208V (single-phase from the
building), the amperes drawn increases by roughly 15% over a 240V service.
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