Appliance classes

   

In the electrical appliance manufacturing industry, the following classes are used to differentiate between the power connection requirements of devices.

Class 0

These appliances are without earthing protection and with simple insulation, intended for dry areas.

Class 1

These appliances must have their chassis connected to the ground, by an earth conductor (yellow/green). The protection is assured by an automatic switch (generally a differential breaker) which, in case of defective insulation, cuts the electric power supply off, by discharging the current to the ground. The differential breaker must be set to the resistance of the earth connection.

Class II

These appliances can be used in all areas without particular measures of protection. However, they must be manufactured under strict rules which assure the consumers that in the case of insulation defects no risk may occur.

See also

External link

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