Hi all,
I have a question about electrical safety that I hope you can solve me.
I have a rail to connect spotlights like the photo rail:

Generally, 220V (L, N and PE) and DALI (DA + and DA-) circulate through this rail. I want to use the DALI connexions to transmit a MODBUS signal (over RS485 bus) to the lights, but I am concerned about the electrical safety of the controller and the lights (all consider the RS485 bus as SELV).
Is there a problem? Would I have to make a galvanic separation in the controller and the spotlights? Only in the controller?
Thank you