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

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  • If you can, please provide a picture or two.
    – MonkeyZeus
    Dec 23 '20 at 17:00
  • I am not sure why anyone would do this unless it was for back feeding the 2nd panel.
    – Ed Beal
    Dec 23 '20 at 17:09
  • Is there anything on the circuit besides this cross connection? Like does the wiring actually power a plug (dryer or stove) or appliance (air conditioner) somewhere?
    – MonkeyZeus
    Dec 23 '20 at 17:23
  • 2
    WOW & Yikes. Announcement: Cleanup needed is aisle 5. Seriously though, the big box in middle might contain CT (Current Transformer) metering equipment to provide a true 400 amp service. But I don't see a POCO lockout tag on it, so I'm not sure. Also, the 30 amp cross connect might be there if one of the panels could be supplied by a generator and then the other panel get power from it. If so, without the proper physical lock mechanisms that prevent generator power from feeding back into the network.... That is all very very sketchy. Dec 23 '20 at 17:53
  • 2
    Pictures of the 2 panels will help a lot. Also, before Harper and then others get a chance, I'll tell you: For the replacement panels, get really big panels. The reasons include AFCI, GFCI and the possibility of adding new circuits or splitting existing circuits. Since your panels are not stuck in finished walls, you have plenty of room to work with. Dec 23 '20 at 18:08

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