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Protecting from power source problems
Surge protectors, line conditioners, and uninterruptible power supplies can help protect
your server against power source problems.
Surge protectors
During a power surge, the voltage level of electricity coming into your server can increase
to far above normal levels and cause data loss or server damage. Protect your server and
peripheral devices by connecting them to a surge protector, which absorbs voltage surges
and prevents them from reaching your server.
When you purchase a surge protector:
■ Make sure that the surge protector meets the appropriate product safety certification
for your location, such as Underwriters Laboratories (UL).
■ Check the maximum amount of voltage the protector allows to pass through the line.
The lower the voltage that the protector allows to pass through, the better the
protection for your server.
■ Check the energy absorption (dissipation) rating. The higher the energy absorption
rating, the better the protection for your server.
■ 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 server from the small fluctuations in voltage from an
electrical supply. Most servers 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 server is located near, or shares a circuit with, a device that causes
electromagnetic interference, such as a television or a motor.
Some surge protectors and uninterruptible power supplies include simple line-conditioning
capabilities.
Warning High voltages can enter your server through the power
cord, and the modem and network connections. Protect
your server by using a surge protector. If you have a
modem, use a surge protector that has the appropriate
type of modem jack. During an electrical storm, unplug the
surge protector and the modem and network cables.