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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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