Sources Of Electrical Interference - HP StorageWorks XP128 Installation Manual

Sources of electrical interference

Preparing for installation
Ensure that the disk array is protected from sources of electrical
interference:
wall outlets Convenience power outlets for building maintenance
equipment (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 and not to the
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.
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.
vibration Continuous vibration can cause a slow degradation of
mechanical parts and, when severe, can cause data
errors in disk drives. Mechanical connections such as
printed circuit assembly (PCA) conductors, cable
connectors, and processor backplane wiring can also
be affected by vibrations.
electromagnetic The disk array is specifically designed to reduce its
interference susceptibility to radiated and conducted interference.
Electromagnetic interference can cause a variety of
system problems. Your HP CE can advise you about
many of the most common causes of electromagnetic
interference.
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