Symbols marked on the instrument
CAT III
Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distribution panel to outlets
CATIV
The circuit from the service drop to the service
entrance, and to the power meter and primary
over-current protection device (distribution panel)
Instrument with double or reinforced insulation
User must refer to the explanations in the instruction
manual.
Earth
Never use on a circuit with voltages higher than
600V.
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