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Oracle® Rack Cabinet 1242 Power Distribution Units User's Guide

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Updated: March 2018

Facility Power Requirements

To prevent catastrophic failures, design your input power sources to ensure that adequate power is provided to the PDUs. Use dedicated AC breaker panels for all power circuits that supply power to the PDU.

Oracle PDUs are designed to measure the incoming line to neutral voltage. There are many power system types which, when connected to the PDU, will ensure that the PDU outlet groups provide the required output voltage. However, the PDUs cannot accurately measure the voltage when connected to certain power system types. Oracle PDUs measure the correct voltage when connected to a wye TN power system. Using any other power system type might lead to incorrect voltage measurements.

Oracle PDUs are designed to be used with TN, TT or IT power systems. However, TN systems are recommended for accurate measuring of environmental variables. For TN power systems, the PDUs must be provided with protective earthing (grounding) from the installation facility through the earth conductor of the PDU power cord. Additional earthing (grounding) is recommended to ensure continued safe operation of your racked product. Refer to Attaching a Grounding Cable in Oracle Rack Cabinet 1242 User’s Guide for instructions.

Note -  For TT power systems, the power source has no earth connection and so the earth connection must be made through the rack. Refer to Attaching a Grounding Cable in Oracle Rack Cabinet 1242 User’s Guide for instructions.

Note -  All Oracle PDUs are suitable for connection to TN and TT power systems. All PDUs with a maximum of a 240V phase-to-phase rating, fuses in each line, and neutral conductors are suitable for IT power systems that supply a maximum of 240V phase-to-phase. If you are installing an Oracle Engineered System, refer to its documentation to determine if the system is suitable for connection to IT power systems.

While the PDU power cords are 4m (13.12 ft.) long, 1 to 1.5m (3.3 to 4.9 ft.) of the cords will be routed within the rack cabinet. The installation site's AC power receptacle must be within 2m (6.6 ft.) of the rack.

Electrical work and installations must comply with applicable local, state, or national electrical codes. Contact your facilities manager or a qualified electrician to determine what type of power is supplied to your building.

When planning for power distribution requirements for installed rack equipment:

  • Balance the power load between available AC supply branch circuits.

  • In the United States and Canada, ensure that the overall system AC input current load does not exceed 80% of the branch circuit AC current rating.