Chauvin Arnoux F407, Руководство пользователя

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As a safety measure, and to avoid repeated overloads on the inputs of the
device, we recommend performing configuration operations only when the
device is disconnected from all dangerous voltages.
MEASUREMENT CATEGORIES
Definitions of the measurement categories :
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.