You can as long as you don't assume that this gives you another 200 Amps to use. Your overall amperage will still be only 200 Amps. You can supply the sub-panel with a smaller breaker than 200 Amps.
Yes, the 200 subfeed kit will allow the full 200 Amp to be drawn from the main meter/panel combo to feed a 200 amp subpanel. A branch breaker is different, and limited to 125 Amps. * What gauge wiring do I need for the 200 amp sub-panel?
I estimate covering 60 feet (give or take) Either #2/0 copper or #4/0 Aluminum is allowed for a 200 Amp residential feeder. * Do all 4 wires need to be the same gauge? No, only the two hots and one neutral need to be full size,Either #2/0 copper or #4/0 Aluminum.
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