Appendix
B
Elite
TM
49
Installation
Category
(Overvoltage
Category)
Classification
of
parts
of
installation
systems
or
circuits
with
standardized
limits
for
transient
overvoltages,
dependent
on
the
nominal
line
voltage
to
earth.
Interlock
A
mechanical,
electrical
or
other
type
of
device
or
system,
the
purpose
of
which
is
to
prevent
or
interrupt
the
operation
of
specified
machine
elements
under
specified
conditions.
LED
Light
‐
Emitting
Diode
Mains
The
electricity
supply
that
is
available
to
the
consumer
from
the
distribution
system
or
systems
for
which
the
equipment
concerned
is
designed.
Maintenance
Planned
or
unplanned
activities
intended
to
keep
equipment
in
good
working
order.
NIST
National
Institute
of
Standards
and
Technology
NRTL
Nationally
Recognized
Testing
Laboratory
Operator
Person
operating
equipment
for
its
intended
purpose.
Pollution
Any
addition
of
foreign
matter,
solid,
liquid,
or
gaseous
(ionized
gases),
that
may
produce
a
reduction
of
dielectric
strength
or
surface
resistivity.
Pollution
Degree
For
the
purpose
of
evaluating
clearances,
the
following
two
degrees
of
pollution
in
the
micro
‐
environment
are
recognized:
Pollution
Degree
1:
No
pollution
or
only
dry,
non
‐
conductive
pollution
occurs.
The
pollution
has
no
influence.
Pollution
Degree
2:
Normally
only
non
‐
conductive
pollution
occurs.
Occasionally,
however,
a
temporary
conductivity
caused
by
condensation
must
be
expected.
Portable
Equipment
Equipment
intended
to
be
carried
by
hand.
Rated
(value)
A
quantity
value
assigned,
generally
by
a
manufacturer,
for
a
specified
operating
condition
of
a
component,
device,
or
equipment.
Risk
The
expected
losses
from
a
mishap,
expressed
in
terms
of
severity
and
likelihood.
Service
Unplanned
activities
intended
to
return
equipment
that
has
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