Especially in the bathroom, it is important that special protective measures are observed when installing electrical connections. Whether it's connections for lighting or the installation of sockets for the use of everyday objects such as a hairdryer or a shaver - the technical specifications are laid down in VDE 0100. The regulations for appliances such as fans or towel radiators are also found there. Socket circuits, for example, must have a residual current circuit breaker (RCD). Equipotential bonding is also mandatory.
In DIN 57100/VDE 100 Part 701, the bathroom is divided into four zones or protected areas. Within each zone, different specifications apply to the equipment and its use. The interior of the bathtub or shower is considered "zone 0" and includes, among other things, the specification that only luminaires that are particularly watertight and offer a high level of protection may be used. Here, only luminaires with protection class IP X7 are permitted. The operating equipment must be permanently installed and may not exceed a current voltage of 12 volts.
Area 1" refers to the area above the bathtub or shower tray. This area extends up to 2.25 meters from the floor in height. Here, the protection class for the lights is IP X5, which ensures protection against water jets. Also, only permanently installed devices are allowed. This includes, for example, fans or boilers. Electrical wiring may only be installed in a vertical direction. Area 2" defines the area of 60 centimeters in depth starting from the bathtub or shower and 2.25 meters in height along the wall. Here, for example, it is possible to connect a washing machine. Area 3" is an extension of area 2 and covers an additional area of 2.40 meters. Here, among other things, sockets and switches with a residual current circuit breaker may be installed.
Source: baunetzwissen.de
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