Shower lighting walk-in shower

But shouldn't it be connected to 230V with a ceiling height of 2.50 m?

No, not directly in the shower! No 230V!

No, not directly in the shower! No 230V!

That is not entirely correct:
The installation zone must be observed.
Zone 1 extends from the floor edge up to 2.25 m in height, but at least up to the corresponding water outlet (i.e. shower head).

From Wikipedia:


Area
Construction of low-voltage systems


Title
Requirements for workplaces, rooms and systems of special types


Short description:
Rooms with bathtub or shower


Last edition
2008-10


ISO





Installation zones in the bathroom

In living spaces, rooms with a bathtub or shower count as dry rooms, although moisture occurs in these rooms. Due to the moisture, there is a particular hazard in these rooms because moisture significantly reduces the human body resistance, and in conjunction with earth potential, even small touch voltages can cause dangerous currents to flow through the human body.
Electrical installations in these rooms should be arranged so that hazards due to electric currents are excluded. The detailed requirements for installation are specified in the DIN standard DIN VDE 0100-701:2008-10.
Different protection zones or protection areas are distinguished:

[*]Protection area 0: Protection area 0 defines the interior of a bathtub or shower with a tub. For showers without a tub (floor-level showers), there is no protection area 0. A radius of 120 cm around the shower head applies as protection area 1.
[*]Protection area 1: Protection area 1 extends above protection area 0 up to a height of at least 2.25 m; if the water connection is higher (e.g., in showers), then up to that height above the floor and applies to areas above bathtubs or showers as well as the area beneath the bathtub or shower up to the installation platform.
[*]Protection area 2: Protection area 2 applies to areas extending 60 cm in front of bathtubs or showers that are within arm’s reach. On the wall sides, the area extends up to a height of at least 2.25 m from the top edge of the floor. At shower entrances, this is a circle with the shower wall as the center (string length). The requirements of protection area 1 also apply. Additionally, installation of lights and connection of washing machines is allowed. Sockets and switches are not permitted.

In protection area 0, devices with a protection rating of at least IPX7 are permitted; in protection areas 1 and 2, at least IPX4. Installation devices such as sockets, junction boxes, etc. are not permitted in protection area 0. Consumables in protection area 0 may only be operated if their operating voltage does not exceed 12 V AC or 30 V DC (the supply transformer must be located outside protection area 1), these must be permanently connected and approved by the manufacturer for this purpose (e.g., bathtub heater).
In protection area 1, electrical consumables are only allowed if they are permanently connected water heaters, whirlpool and wastewater pumps, or exhaust devices. Other consumables or installation devices are permitted if their operating voltage does not exceed 25 V AC or 60 V DC. Again, the power sources for supply must be installed outside protection areas 0 or 1.
Cables and lines must be routed to the corresponding devices from the back or from above. Only cables and lines supplying the devices located there may be laid within protection areas 0, 1, and 2. The protection area also extends 6 cm into the wall and therefore, besides the effects on apparent wiring within the bathroom, requires that a mineral residual wall thickness of at least 6 cm must be observed for cables in adjoining rooms, as otherwise these would be considered located within the corresponding protection area and thus may not be installed there.
To protect residents from dangerous body currents, circuits in these rooms must be equipped with a protective conductor and a residual current device (RCD) with a tripping current of no more than 30 mA.