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Symbols

CAT.III

Primary electrical circuits of the equipment connected

directly to the distribution panel, and feeders from the

distribution panel to outlets.



Instrument with double or reinforced insulation

User must refer to the explanations in the instruction

manual.



(Functional) Earth terminal

Crossed-out wheel bin symbol (according to WEEE

Directive: 2002/96/EC) indicating that this electrical

product may not be treated as household waste, but

that it must be collected and treated separately.

○ Measurement (over-voltage) category

To ensure safe operation of measuring instruments, IEC 61010

establishes safety standards for various electrical environments,

categorized as CAT.I to CAT.IV, and called measurement categories.

Higher-numbered categories correspond to electrical environments

with greater momentary energy, so a measuring instrument

designed for CAT.III environments can endure greater momentary

energy than one designed for CAT.II.

CAT.I : Secondary electrical circuits connected to an AC

electrical outlet through a transformer or similar device.

CAT.II : Primary electrical circuits of equipment connected to an

AC electrical outlet by a power cord.

CAT.III : Primary electrical circuits of the equipment connected

directly to the distribution panel, and feeders from the

distribution panel to outlets.

CAT.IV : The circuit from the service drop to the service entrance,

and to the power meter and primary overcurrent

protection device (distribution panel).

Transformer

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Kyoritsu 4300 Manuale Utente Pagina 5