Extech Instruments EX350 User Manual page 5

Safety Symbols that are typically marked on meters and instructions
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLT AGE CATEGORY I is equipment for connection to circuits in which measures are
taken to limit the transient over‐voltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of 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
This symbol, adjacent to another symbol, indicates the user must refer to the
manual or user guide for further information.
Risk of electrical shock
Fuse symbol
Equipment protected by double or reinforced insulation
Low Battery symbol
Conforms to EU directives
Do not discard this product in household trash.
AC measurement
DC measurement
Earth ground
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