HP rp7400, Hardware Manual

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Identify Sources of Electrical Interference
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Identify Sources of Electrical Interference
The following are some of the sources of electrical interference that may affect rp7400 servers.
Convenience Wall Outlets
Power outlets for building maintenance equipment (i.e., vacuum cleaners, floor buffers, etc.) must be wired
from circuit breakers on a power panel separate from the computer system panel. The ground wires from
these outlets must be connected to the normal building distribution panel; not the computer system ground.
If a separate power source and separate ground are not provided, operation of janitorial equipment can
induce electrical noise and cause abnormal operation of the computer system. Your electrician can verify
whether or not maintenance outlets are on separate panels.
Lightning
In some geographical areas it may by advisable to install lightning protection for both personnel and
computer systems. In the United States (USA), the installation of lightning or surge arrestors on power and
communication lines is described in the National Electrical Code, Article 280. All lightning arrestors must
have the UL 1449 rating and should be tested to survive the suite of IEEE587 tests.
The principles of lightning protection and personnel safety are outlined in detail in the lightning protection
code contained in the National Fire Protection Association (NFPA) Handbook.