상황
A facility needs a 400 A three-phase distribution board that supplies a motor control center feeder from the main ACB.
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01
Model each pole of the three-phase ACB as a separate disconnect switch on L1, L2, and L3
02
Return all phase sources to a common grounded neutral (net 0) to satisfy ground reference
03
Use no_connect markers on feeder ends to indicate MCC connection points without adding unknown motor starter components
Use this pattern for panel-line diagrams where protection and feeder isolation are the focus and downstream loads are outside the board scope.