For Power sypply : if u have 24 VDC power and based on accptable voltage drop of 20% (Means you will get @19 V at transmitter with 1 amp load and is acceptable for working of instrument), minimum 2.5 mm2 cable is required if your load is @1 amp and distance is @ 300 meters
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For RS 485 it is ok and for specific application u can have supply and signal in same JB as votage level are low but it should not be apply to complete project.
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