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Read this and you will know the answer:
A common misconception is that utility power is consistent and steady.
It isn't. No matter where you are, spikes, surges, brownouts and other
power problems pose potential hazards to your computer or network. Other
sources of problems are storms that can damage above-ground utility
wires. The lightning that often accompanies storms is an obvious problem
in itself. Older buildings may have inadequate wiring that can become
overloaded and cause power failures.
The resulting power disruptions take many forms including power surges
and sags, high-voltage spikes, switching transients, brownouts and complete
power failure. With any power fluctuation, you have the potential for
data damage, data loss, file corruption and hardware damage. And it's
not always immediately noticeable. The damage may not be noticed until
long after the power disruption.
POWERWARE uses three basic UPS technologies designed to provide power protection.
These are on-line, line-interactive and off-line. On-line UPS provide
the highest level of power protection and are the ideal choice for shielding
important mission-critical computer systems and data.
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