Circuit breaker, RCD and KNX actuator order

[Jeecha]

Hello,

From electrical safety point of view, what is the permissible order of the devices for a home electrical installation?

My electrician has planned individual circuit breaker (and RCD where applicable) on EVERY line between KNX actuator (switch or dimming) and the wall socket/light.
Because of that the distribution, as currently planned, will have close to 200SU just for circuit breakers and RCDs. Is that really necessary, or can the lines be grouped and circuit breaker installed for a group before KNX actuator?

Current planning:
Source--->KNX switch/dimmer--->Circuit-breaker (plus RCD where needed) --->Socket/Light fixture

Is this allowed?
Source--->Circuit-breaker, RCD--->KNX switch/dimmer===>Multiple low power sockets/light fixtures

For example - there are 18 individually KNX switched (multiple scenes) groups of outdoor lights, which all are LED and with a combined maximum total power of about 400W. However, as currently planned, there is a circuit breaker installed on each of the lines, plus individual RCDs for light fixtures that are installed on ground. This seems like a waste of distribution board space and money, as individual protection of each line is not really necessary here and to me it would be acceptable that if one light trips a breaker, they would all go out together.

Thanks,
Jekabs

[dancingman]

This seems like a waste of distribution board space and money, as individual protection of each line is not really necessary here

Right. Your proposed wiring is the most common one.

[gbglace]

In case of some LED lights (24V CV) extra protection elements could be necessary behind KNX-switch/dimmer.