Preface
11
QutePC
‐
1010
User’s
Manual
system
can
result
in
electrical
shorts,
which
can
cause
serious
damage
to
the
system.
Buildings
in
which
climate
is
controlled
usually
maintain
an
acceptable
level
of
humidity
for
system
equipment.
However,
if
a
system
is
located
in
an
unusually
humid
location,
a
dehumidifier
can
be
used
to
maintain
the
humidity
within
an
acceptable
range.
Refer
to
the
“Specifications”
section
of
this
user’s
guide
for
the
operating
and
storage
humidity
specifications.
Altitude
Operating
a
system
at
a
high
altitude
(low
pressure)
reduces
the
efficiency
of
the
cooling
fans
to
cool
the
system.
This
can
cause
electrical
problems
related
to
arcing
and
corona
effects.
This
condition
can
also
cause
sealed
components
with
internal
pressure,
such
as
electrolytic
capacitors,
to
fail
or
perform
at
reduced
efficiency.
Power
Protection
The
greatest
threats
to
a
system’s
supply
of
power
are
power
loss,
power
spikes,
and
power
surges
caused
by
electrical
storms,
which
interrupt
system
operation
and/or
damage
system
components.
To
protect
your
system,
always
properly
ground
power
cables
and
one
of
the
following
devices.
Surge
Protector
Surge
protectors
are
available
in
a
variety
of
types
and
usually
provide
a
level
of
protection
proportional
with
the
cost
of
the
device.
Surge
protectors
prevent
voltage
spikes
from
entering
a
system
through
the
AC
power
cord.
Surge
protectors,
however,
do
not
offer
protection
against
brownouts,
which
occur
when
the
voltage
drops
more
than
20
percent
below
the
normal
AC
line
voltage
level.
Line
Conditioner
Line
conditioners
go
beyond
the
overvoltage
protection
of
surge
protectors.
Line
conditioners
keep
a
system’s
AC
power
source
voltage
at
a
fairly
constant
level
and,
therefore,
can
handle
brownouts.
Because
of
this
added
protection,
line
conditioners
cost
more
than
surge
protectors.
However,
line
conditioners
cannot
protect
against
a
complete
loss
of
power.
Uninterruptible
Power
Supply
Uninterruptible
power
supply
(UPS)
systems
offer
the
most
complete
protection
against
variations
on
power
because
they
use
battery
power
to
keep
the
server
running
when
AC
power
is
lost.
The
battery
is
charged
by
the
AC
power
while
it
is
available,
so
when
AC
power
is
lost,
the
battery
can
provide
power
to
the
system
for
a
