Requirement for safety measures in place against electric shocks, applying to electric devices.
Protection category I: Protective earthing
Protection category II: Protective insulation
Protection category III: Protective extra-low voltage
IP = Ingress Protection. Indicates the level of protection for the housing against external influences, in compliance with DIN EN 60529. The first figure describes protection against foreign bodies, the second figure describes protection against water. The higher the individual values are, the higher the respective protection level is.