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Do i get the Wiring of the Power Supply right?:

Outlet ------ Cable --------> Relay Board ---------Cable --------> Printer Power Supply (My Printer does not have a switch)

Does it matter in which way I connect the Cables to the Relay?
The Screw Terminal is build like that I believe : [Normally Open] [Common Ground] [Normally Closed]
Is the Left Cable going to your Power Supply or the Outlet?
Looking forward for a reply.