There used to be few gaps in the AS3000 wiring standards.
By giving it a plug in lead, you got around the rulings.
You could still build it this way, then go have a sparky inspect it and place a safety tag on it perhaps....
I have a 240volt relay that controls my projector screen, i just mounted the whole thing in the switchboard din rail, the trigger signal comes from the projector via a 12v line.
But if you want to make a "Product", you better go get it engineered first, then start following what ever manufacturing standards you have too.
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