Sun Microsystems Server X4-2, Руководство по установке

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Preparing for Server Installation 9
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Fluctuations caused by brownouts
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Wide and rapid variations in input voltage levels or in input power frequency
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Electrical storms
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Faults in the distribution system, such as defective wiring
To protect your server from such disturbances, you should have a dedicated power
distribution system, power-conditioning equipment, as well as lightning arresters or
power cables to protect from electrical storms.
See the following sections for additional power specifications.
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“Facility Power Guidelines” on page 9
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“Circuit Breaker and UPS Guidelines” on page 9
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“Grounding Guidelines” on page 10
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.
To prevent catastrophic 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 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
To prevent catastrophic failures, the design of your power system must ensure that
adequate power is provided to the Sun Server X4-2. Use dedicated AC breaker panels
for all power circuits that supply power to the Sun Server X4-2. Electrical work and
installations must comply with applicable local, state, or national electrical codes.
The Sun Server X4-2 requires electrical circuits to be grounded to the Earth.