2 Power supplies in the same line

[fireblade]

Hi,

I would like to know if anyone has experience of connecting two power supplies in the same line?
I'm asking this because I'm going to install a new knx installation in my home, but I would like to have a spare/redundant power supply, for if the main one fails I would connect the backup one.
The ideia is to put the two power suppliers in the cabinet, but only one is connected, the other one is disconnected in the circuit breaker, and would be connected if the main one fails.
What I would like to know is, if someone switchs on by mistake the circuit breaker of the second power supply, what would happen?

Thanks