ᐅ Sizing of Sub-Distribution Boards (Electrical & Multimedia by Hager)

Hello everyone,

I’m still having some difficulties estimating the sizing of sub-distribution boards in a three-family house.

How would you estimate the required DIN rails in an apartment if the first DIN rail is reserved for terminal blocks (Wago)?
Additionally, there are:

• 2-4 KNX rings
• 8 LAN outlets
• 9 electric roller shutters
• 9 switchable ceiling lights
• 7 rooms. Each room has 2 switchable sockets, the rest are constant power
• Each room will have a presence detector
• I want to avoid individual room control for underfloor heating, but each room should at least be prepared for it (likely via an MDT push button)
• The kitchen might already have about 5 circuit breakers plus lighting for:
• Sockets
• Refrigerator, microwave, dishwasher
• Oven
• Cooktop
• Boiler/Quooker reserve/preparation
• Some small visualization in the hallway, e.g.:
• Turn off all power except the refrigerator
• Raise or lower all roller shutters
• ...
• Each apartment will have a central controlled mechanical ventilation system (controlled mechanical ventilation). I’m not sure how or whether it makes sense to integrate or control this via smart home
• Provision for a split air conditioning unit is also planned. Again, I’m unsure about smart home integration or control
• Each window has a reed contact installed
• Potentially a wind sensor on the roof to react to strong gusts or storms
• I haven’t thought much about the front door setup yet (doorbell, video, etc.). However, a fingerprint reader is integrated
• Digital locking cylinders would be interesting (e.g., SimonsVoss)

I now have the following options:

• Use small distribution boards with 3 to 5 rows and a separate multimedia distribution, either in different rooms (sub-distribution board near the apartment entrance and multimedia in the technical room)
• Use a field distribution board with 2 sections. Left side: DIN rails; right side: multimedia area. Due to its width, this field distribution can only be installed in the technical room of the apartment. However, the cable feed to the field distribution would then be about 4m longer
• A single-row field distribution board with 6 to 7 or more rows, where you buy the interior components separately—for example, 4 rows for DIN rails and the rest for multimedia. This single-row field distribution board would fit next to the apartment door again

Sorry, I just realized I unnecessarily started a new thread. I could have combined this with one of my previous posts.