Lighting theory

Safety classes

Safety class I indicates luminaires for connection to a protective earth conductor. In the event of a fault, the mains is disconnected by overload/residual current protective devices.

Safety class II indicates luminaires that have protective insulation in addition to the operational insulation. Under fault conditions, no dangerous voltage can reach metal parts which can be touched.

Safety class III indicates luminaires for safety extra-low voltage. Connection only to safety transformers in accordance with EN 61558 / VDE 0570, EN 61347 / VDE 712 or VDE 0100 Part 410. The transformer must be approved for this type of installation.