User's Manual

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

Note-

OVERVOLTAGE CATEGORY II

Note-

OVERVOLTAGE CATEGORY III

Note-

OVERVOLTAGE CATEGORY IV

Note-

Equipment of is equipment for connection to circuits

in which measures are taken to limit the transient overvoltages to an appropriate low

level.

Examples include protected electronic circuits.

Equipment of is energy-consuming equipment to

be supplied from the fixed installation.

Examples include household, office, and laboratory appliances.

Equipment of is equipment in fixed installations.

Examples include switches in the fixed installation and some equipment for

industrial use with permanent connection to the fixed installation.

Equipment of is for use at the origin of the installation.

Examples include electricity meters and primary over-current protection

equipment