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CHAPTER
Protecting Your Equipment and Data
Surge
Lightning, electrical surges, and power fluctuations can damage your equip-
ment and/or data through the power lines and/or the serial data lines. When
electrical storms occur, the most effective method of protecting your com-
puter system is to unplug your computer and peripherals, and disconnect
all data and telephone lines.
To protect against lightning, electrical surges, and power fluctuations,
recommends uninterruptible power supplies power line filters, and
surge protectors for every installation.
A UPS can provide protection from electrical surges and fluctuations in the
power supplied to the computer. However, it does little good to protect the
main console if you have no protection on the other devices attached to the
system. Power line filters protect against electrical surges and transient
spikes. Some filters even have a shutdown feature that drops power to the
device if voltage drops below a preset level. This prevents the spikes and
surges caused by the typical “off and on” electrical problems that occur
during a thunderstorm. AC line filters should be used with all electrical
devices connected to a computer system, no matter how small or simple.
The interface cables themselves present another potential danger. Nearby
lightning strikes can induce high-voltage surges into the cables. Machinery,
especially commercial machines with electric motors, often generates elec-
trical noise that can be picked up by cables and cause data errors or
equipment damage. includes on every and
optionally on the clips fast-rising peak voltages to
help protect against spikes over twenty-five volts caused by lightning,
static, or induced voltage. For maximum protection we recommend surge
suppressors on the peripheral end of all serial cables.
Cables running long distances and/or through electrically noisy areas are
subject to noise pickup that can cause data errors or equipment damage.
Destructive power surges can also enter through modems via telephone
connections. Filters made specifically for this purpose should be included
on all telephone line connections.
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