Class II is equipment in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as supplementary insulation are provided.

There is no provision for the connection of exposed metalwork of the equipment to a protective conductor, and no reliance upon precautions to be taken in the fixed wiring of the installation.

The user is protected by at least two layers of insulation. For this reason, Class 2 appliances are also known as Double Insulated. They do not require an earth connection.

Some examples of class 2 equipment include computers, televisions, some power tools.