Technical data

Power Requirements
5-3
5
Laser printers and some other devices cause periodic short
duration heavy loads that are not reflected in their ampere ratings.
Connect laser printers on a separate branch circuit from the
computer enclosure.
Using power strips with separate circuit breakers does not add
additional protection and may cause unwanted power
interruption. Ensure that all power strips or extension cords used
are not too long and are at least #16 (the best choice is #14 AWG or
larger) with ground.
The use of surge/transient suppressors is not recommended
without careful and expert power system analysis. Most
surge/transient suppressors can cause system damage from
transients if used in the typical manner.
All branch circuits must have a “third wire” type ground for the
branch circuit that only goes to the circuit breaker panel. Conduit
ground is unacceptable for any portion of the system. It is better if
“orange” insulated ground outlets are used for the computer
system where conduit is present. Do not connect the ground wire to
the conduit or the outlet box when using insulated ground outlets.
Blinking lights or fluctuating intensity from lighting at the
computer site are an indication of poor power. This may be a cause
of possible system hang ups. Investigate the electrical installation to
ensure proper system operation.
Power Circuit Protection
Ideally, the power circuit should be protected by an electrical line
filter that prevents voltage spikes caused by unusual outside forces
from reaching the computer. The most desirable means is to use a
“no-break” UPS (uninterruptible power supply) to furnish power
to your system's processor enclosure. A no-break (also known as
“online”) UPS makes the central processor less susceptible to the
voltage fluctuations, spikes, and frequency aberrations inherent in
most power systems.