Why Class 2 equipment must not be earthed

Class 2 equipment is an essential part of electrical systems. It includes devices that do not rely on a protective earth connection for their safety, unlike Class 1 equipment. However, there are specific reasons why Class 2 equipment must never be earthed, as explained below.

The concept of Class 2 equipment

Class 2 equipment is designed based on the principle of double insulation, where two layers of insulating material protect the user from electric shocks. This technique provides an additional layer of safety by eliminating the need for an earth connection. In Class 2 equipment, the internal components are insulated in such a way that even if a fault occurs, the chances of electric shock reaching the user are minimized.

Dangers of earthing Class 2 equipment

Earthing Class 2 equipment can introduce serious safety hazards. When these devices are connected to the earth, any leakage current would flow directly into the ground. As a result, a faulty Class 2 equipment could cause residual currents to pass through the grounding system, which can lead to electric shock hazards. The purpose of Class 2 equipment being isolated from the earth is to ensure that such fault currents do not reach the user.

Fulfilling safety requirements with Class 2 equipment

Manufacturers of Class 2 equipment comply with stringent safety regulations and standards. These well-established standards, such as IEC 61140, mandate the practical implementation of double insulation techniques. By adhering to these standards, manufacturers guarantee a high level of protection against electric shocks. When Class 2 equipment is used correctly according to the manufacturer's instructions, it ensures a safe and reliable operation without the need for an earth connection.

In conclusion, Class 2 equipment should never be earthed due to the inherent risks associated with such an action. The design and construction of Class 2 devices incorporate double insulation, eliminating the need for an earth connection. By strictly adhering to safety standards and guidelines, these devices provide reliable protection against electric shocks while ensuring efficient operation.