Electrical Requirements
Caution - Servers must have a reliable power source. If the system exceeds the ranges, damage
to the server might occur. Electrical disturbances, such as the following, might damage the
system:
■
Fluctuations caused by brownouts
■
Wide and rapid variations in input voltage levels or in input power frequency
■
Electrical storms
■
Faults in the distribution system, such as defective wiring
To protect your server from such disturbances, use a dedicated power distribution system,
power-conditioning equipment, and lightning arresters or power cables for protection from
electrical storms.
See the following additional power specifications.
■
“Facility Power Guidelines” on page 19
■
“Circuit Breaker and UPS Guidelines” on page 20
■
“Grounding Guidelines” on page 20
Facility Power Guidelines
Electrical work and installations must comply with applicable local, state, or national electrical
codes. To determine the type of power that is supplied to the building, contact your facilities
manager or qualified electrician.
To prevent failures:
■
Design the input power sources to ensure adequate power is provided to the power
distribution units (PDUs).
■
Use dedicated AC breaker panels for all power circuits that supply power to the PDU.
■
When planning for power distribution requirements, balance the power load between
available AC supply branch circuits.
■
In the United States and Canada, ensure that the current load of the overall system AC input
does not exceed 80 percent of the branch circuit AC current rating.
PDU power cords for the Oracle Rack Cabinet 1242 and Sun Rack II are 4 meters (13.12 feet)
long, and 1 to 1.5 meters (3.3 to 4.9 feet) of the cord might be routed in the rack cabinet. The
installation site AC power receptacle must be within 2 meters (6.6 feet) of the rack.
Preparing for Server Installation 19
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