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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.
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