Power Line Transients; Protection Against Sources Of Electrical Interference; Uninterruptible Power Supply (Ups); Sources Of Electrical Interference - HP StorageWorks XP10000 - Disk Array Manual

Power line transients

Heavy electrical loads from nearby machinery or equipment (for example, elevators or electric welders)
can cause intermittent system problems with sophisticated electronic equipment, even if that equipment
is on a separate circuit breaker. When faced with these conditions, provide a separate, completely
independent power panel with an isolated ground and circuit breaker coming directly from the main
building power source or secondary power source.
If necessary, an HP representative can measure your power line noise level and make appropriate
recommendations concerning the use of line treatment devices.

Protection against sources of electrical interference

Protect the disk array from sources of electrical interference:
Table 14 Sources of electrical interference
Potential source
Wall outlets
Lightning
Electromagnetic
interference

Uninterruptible power supply (UPS)

Most disk array units are installed in data centers where a UPS strategy is already in place. However,
if you are making your first large disk array purchase, you may need a separate UPS solution.
CAUTION:
If you are planning or already have a site-wide UPS, HP recommends against using a product UPS powered
by a site-wide UPS for the HP XP10000 disk array.
Make sure your UPS satisfies the power requirements listed in
"Heat dissipation, power consumption, and air flow
"AC line voltage
Description
Convenience power outlets for building maintenance equipment (such as vacuum
cleaners and floor buffers) 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 maintenance outlets are on
separate panels.
In geographical areas subject to lightning storms, 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.
The HP system is specifically designed to reduce its susceptibility to radiated and
conducted interference. Electromagnetic interference can cause a variety of system
problems. An HP representative can advise you about the most common causes of
electromagnetic interference.
requirements" on page 41.
specifications" on page 33 and also in
XP10000 Disk Array Site Preparation Guide 39