KYORITSU 4300 - Manual (Page 5)

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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