Protection classes for electrical equipment
All electrical products must be protected to prevent access to parts that are live with dangerous voltage. This protection is designed in different ways depending on the product.
There are three protection classes.
Class I electrical equipment not only has basic insulation to protect against electric shock, but the exposed and accessible conductive parts also have a protective earth connection.
In Class II electrical equipment, the protection against electric shock is provided by the basic insulation in combination with an additional safety feature such as double insulation or reinforced insulation.
Class III electrical equipment is protected against electric shock because it is supplied from a SELV power source with a voltage not exceeding 50 V AC or 120 V DC from a protective transformer, and in addition, the appliance does not generate higher voltages.