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True RMS
Digital Multimeter
User Manual
This symbol indicates that
a
device is protected throughout by double
insulation
or reinforced insulation.
□
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits
in which
measures are taken
to
limit the transient overvoltages
to
an
appropriate low
level.
Note- Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment
ot
OVERVOLTAGE CATEGORY II
is
energy-consuming equipment to
be supplied from the fixed installation.
Note- Examples
include
household, office,
and laboratory
appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note- Examples include switches in the fixed installation and some equipment for
industrial use with
permanent
connection
to
the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of
OVERVOLTAGE CATEGORY IV is for use at the
origin of
the installation.
Note-
Examples
include
electricity meters
and
primary over-current protection
equipment
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