You need to understand the logic behind the regulations - The reason for running positive and negative in th esame wireway as earth is for in case of arching the neg or live can short to earth and the inverter will detect the fault and switch off
Wire ways are still under consideration under SANS60364-7-712 - SANS 10142-1 is clear on using a wireway
712.527 Selection and erection of wiring systems to minimize spread of fire
Under consideration.
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