"That amount of power could run a small town."Hey Caigiday,
What are you running that sucks up 70KW? If both power supplies are running at the same time, a simple switch, rated for that power consumption would be okay. If not, then the unit you are running must be capable of down time until the second power source is up and running.
But my first suggestion, and your original question, would be to get a qualified electrician to diagnose and install what you need. That amount of power could run a small town.
Dan
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