<s>
An	O
accidental	O
condition	O
that	O
causes	O
a	O
functional	B-General_Concept
unit	I-General_Concept
to	O
fail	O
to	O
perform	O
its	O
required	O
function	O
.	O
</s>
<s>
In	O
power	O
systems	O
,	O
an	O
unintentional	O
short	B-Application
circuit	I-Application
,	O
or	O
partial	O
short	B-Application
circuit	I-Application
,	O
between	O
energized	O
conductors	O
or	O
between	O
an	O
energized	O
conductor	O
and	O
ground	O
.	O
</s>
<s>
A	O
random	B-General_Concept
fault	I-General_Concept
is	O
a	O
fault	O
that	O
occurs	O
as	O
a	O
result	O
of	O
wear	O
or	O
other	O
deterioration	O
.	O
</s>
<s>
Manufacturers	O
will	O
often	O
accept	O
random	B-General_Concept
faults	I-General_Concept
as	O
a	O
risk	O
if	O
the	O
chances	O
are	O
virtually	O
negligible	O
.	O
</s>
<s>
For	O
example	O
,	O
an	O
Xbox	B-Operating_System
360	I-Operating_System
console	O
will	O
deteriorate	O
over	O
time	O
due	O
to	O
dust	O
buildup	O
in	O
the	O
fans	B-Application
.	O
</s>
<s>
This	O
will	O
cause	O
the	O
Xbox	B-Operating_System
to	O
overheat	O
,	O
cause	O
an	O
error	O
,	O
and	O
shut	O
the	O
console	O
down	O
.	O
</s>
<s>
Systematic	B-General_Concept
faults	I-General_Concept
are	O
often	O
a	O
result	O
of	O
an	O
error	O
in	O
the	O
specification	B-Application
of	O
the	O
equipment	O
and	O
therefore	O
affect	O
all	O
examples	O
of	O
that	O
type	O
.	O
</s>
<s>
Failures	O
in	O
hardware	O
can	O
be	O
caused	O
by	O
random	B-General_Concept
faults	I-General_Concept
or	O
systematic	B-General_Concept
faults	I-General_Concept
,	O
but	O
failures	O
in	O
software	O
are	O
always	O
systematic	O
.	O
</s>
