Safety; International Safety Symbols; Iec1010 Overvoltage Installation Categories - Extech Instruments GX900 User Manual

SAFETY
INTERNATIONAL SAFETY SYMBOLS
This symbol, adjacent to another symbol or terminal, indicates the user must
refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use,
hazardous voltages may be present
Double insulation
This symbol advises the user that the terminals so marked must not be
connected to a circuit point at which the voltage with respect to earth ground
exceeds (for this specific instrument) 1000VAC or VDC
WARNING
CAUTION
IEC1010 OVERVOLTAGE INSTALLATION CATEGORIES
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which
measures are taken to limit the transient over‐voltages to an appropriate low level. Examples
include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy‐consuming equipment to be supplied from
the fixed installation. 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. Examples
include electricity meters and primary over‐current protection equipment.
This symbol indicates a potentially hazardous situation, which if not
avoided, could result in death or serious injury.
This symbol indicates a potentially hazardous situation, which if not
avoided, could result in damage to the instrument.
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Extech Instruments
GX900-EU-EN V1.6 4/14