Hi every one I’m n newbie and this is my first post and I hope that I can also provide some info while I’m here.
Sorry to start with a problem and hope that someone can help, I’ve connected our companies main power to a generator.
The main power comes from the municipality (3 phase) runs throw the generator then feeds back to another circuit breaker on the DB that feeds the building.
This all works well and all the power is on in the building but when I connect the battery of the generator then the generator starts while the main power is still on.
This is wrong obviously because I want to connect the generators battery and then I want to switch the main power off and then the generator should start.
Do I need a change over switch or am I missing something the folks removed it from there old offices and we installed the generator at the new office and they set it worked fine and there were no change over switch.

Its got a panel with a DKG 105 DATAKOM on it with now wiring diagram.

Help would be much appreciated