Electrical Power Requirements
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“Grounding Guidelines” on page 19
Facility Power Guidelines
Electrical work and installations must comply with applicable local, state, or national electrical
codes. Contact your facilities manager or qualified electrician to determine what type of power
is supplied to the building.
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 overall
system AC input current load does not exceed 80 percent of the branch circuit AC current
rating.
For example, PDU power cords for the Oracle's 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 within the rack cabinet. The
installation site AC power receptacle must be within 2 meters (6.6 feet) of the rack.
Circuit Breaker and UPS Guidelines
The design of your power system must ensure that adequate power is provided to the server.
Use dedicated AC breaker panels for all power circuits that supply power to the server.
Electrical work and installations must comply with applicable local, state, or national electrical
codes. The server requires electrical circuits to be grounded to the Earth.
Note - Circuit breakers are supplied by the customer. One circuit breaker is required for each
server power cord.
In addition to circuit breakers, provide a stable power source, such as an uninterruptable
power supply (UPS) to reduce the possibility of component failures. If computer equipment is
subjected to repeated power interruptions and fluctuations, then it is susceptible to a higher rate
of component failure.
Grounding Guidelines
The rack must use grounding-type power cords. For example, Oracle's Sun Rack II has three-
wire, grounding-type power cords. Always connect the cords to grounded power outlets.
Preparing for Server Installation 19