We love to splash around in the bathroom, but that can lead to the whole room becoming damp or even wet. So, for this reason, the bathroom is divided into lighting protection zones. Protection zone 0 is for lights installed directly inside showers and bathtubs, which must be equipped for temporary immersion, i.e. the second digit of the IP protection class, which protects against moisture, must be at least a 7. Protection area 1 is the area on the ceiling above the shower or bathtub. Here the second digit must be at least 5 (protection against jet water). In protection zone 2 - i.e. 60 cm from the shower and bathtub - the same applies to lights as in protection zone 1. Other electrical appliances such as washing machines fall into IP protection class X4. While in protection zone 3 (outside the areas mentioned above), IP protection class X1 is sufficient for bulbs that need protecting from vertically impinging dripping water.