In a 3 phase 4-wire system. For a 3.5 core cable if all loads are single phase a

In a 3 phase 4-wire system. For a 3.5 core cable if all loads are single phase and balanced, what will be neutral current?
will it be sum of all phase currents?
Or it will be zero?
And if loads are unbalanced what will be neutral current?

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