Line Conditioners; Uninterruptible Power Supplies - Gateway 7400 System Manual

Check the energy absorption (dissipation) rating. The higher the energy
absorption rating, the better the protection for your system.
Check for line-conditioner capabilities. A line conditioner smooths out
some of the normal line noise (small voltage fluctuations) of an electrical
supply.

Line conditioners

A line conditioner protects your system from the small fluctuations in voltage
from an electrical supply. Most systems can handle this variation, called line
noise, without problems. However, some electrical sources include more line
noise than normal. Line noise can also be a problem if your system is located
near, or shares a circuit with, a device that causes electromagnetic interference,
such as a television or a motor.
Some surge suppressors and uninterruptible power supplies include simple
line-conditioning capabilities.

Uninterruptible power supplies

Use a standby uninterruptible power supply (UPS) to protect your server from
data loss during a total power failure. A UPS uses a battery to keep your server
running temporarily during a power failure and lets you save your work and
shut down your server. You cannot run your server for an extended period
of time while using only the UPS.
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Managing Your System