My apologies, I am terrible at descriptions but I know can turn off the breaker to disconnect the wires. What I really need to do is to disconnect those wires from the breaker box so the barn that was sold has no power. The new owner needs to get his own service and not use my clients.

If I leave off the 200 amp breaker I also shut off the barn and greenhouse, and they need to stay on.

I just want the disconnect to be safe so I referenced codes but it may just be unscrew and cover with tape.

I may be overthinking it and all I need to do is disconnect those wires and pull them out of the service box. But I worry that somebody would connect the other end to a new service by accident.

So when i disconnect these wires what do I do with them?