Chauvin Arnoux C.A 5231 Notice De Fonctionnement page 26

MEASUREMENT CATEGORIES
Definitions of the measurement categories according to
standard IEC 61010-1:
CAT I: Circuits not directly connected to the network and
specially protected.
Example: protected electronic circuits.
CAT II: Circuits directly connected to the low-voltage
installation.
Example: power supply to household electrical appliances and
portable tools.
CAT III: Power supply circuits in the installation of the building.
Example: distribution panel, circuit-breakers, fixed industrial
machines or devices.
CAT IV: Circuits supplying the low-voltage installation of the
building.
Example: power lines, meters, and protection devices.
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