Video shows connections.
Where two electrical circuits are connected to a wire that has one hot black wire and one hot red wire, that shares the same neutral wire, the the red and black wires must be connected to two breakers beside each other and be joined with a common trip or a 220 volt type double pole breaker so they are fed from opposite phases. The phases are the two 110’s that make the 220 volts which are alternated from one 110 volt breaker to the next as you go down one side of the buss bar.
Because the two circuits share a neutral of the same wire size which would be under sized for the draw should both wires be attached to the same phase, by mandating that the breakers be installed one above the other, they will pull from different 110 volt circuits without overloading the neutral wire.
Because the two hot wires go to different circuits they are not a 220 volt circuit.
By having the common trip it makes it safer for electricians working on down line wiring by ensuring that both live wires are dead should one of the two circuits trips.
It is a fire safety concern if they are incorrectly wired and positioned because the neutral wire will overheat.
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