I was talking about the supply conductors from one structure to another. The second structure would have a disconnecting means so you could have two neutrals after that point.
I was picking nits.
MWBCs work electrically because the neutral currents cancel at the point where they are connected, wherever that is, even if it's inside the panel where the MWBC originates. They work financially because, as Mike says in that video, they save the cost of a wire.
This isn't an MWBC problem, it's a "separate structure" problem.
if a separate structure such as a garage is fed with a single branch circuit or a feeder to a subpanel is a disconnect required at the separate stucture or is the disconnecting means in the main building which feeds the stucture sufficient? Or say a pool house ,kennel etc?
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What's described is common data center wiring where 120/208 is run under the floor and single phase whips are taken off a box with no intervening disconnecting means. It's less common in pre-wired office cube partitions (another example given) because all of the phase conductors tend to be present. But for data centers? It's 120/208 Wye to a box under a rack, and if the rack doesn't need all the available power and only has 120 volt loads, all that's brought up through the floor is a single phase, with it's own neutral, and there's no disconnecting means below the floor, only at the PDU.
