I have a house with 2 main 200 amp panels. These will need to be replaced as the are Federal Pacific. Each panel has its own 200 amp main breaker. I am in the process of tracking down what wires go where and it appears that the 2 panels are cross connected by a 30 amp 2 pole breaker in each.
Why would you do this and isn't this dangerous?
The wire in question is: Left box second black cable on top right Right box far/first right cable on top right