About AC-DC wiring duct separation


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In Job spec of many customers, The requirement given for SPACING between wiring DUCT of AC/DC signal (passing in Parallel route) is min 50 mm in Marshaling/Control system Cabinets. What is exact reason for such spacing between AC and DC duct? Do we need to strictly follow when signal level is 220 AC and 24 DC?

Kindly Revert