Hello I am with an installation of a printing press. The ground floor has its general board, here there are heavy machines with large engines and two very sensitive electronic machines. The upper floor is almost exclusively electronic (pc, monitors, printers, plotters) I have the computer part divided into two circuits since it is extensive. And I have another line for some plotters. This is the top floor, with its separate board, but below I have another board and I have another machine to protect with a tension protector. My question is how I could apply protection to these 5 different circuits; making it with each circuit a contactor governed by a protector, or several individual voltage protectors, or if controlling everything with a single contactor and downstream of this drift in those circuits Given the economy a bit, but never protection. My other question is whether for the aforementioned sensitive machines I could make an earthing independent of the general earthing, or if everything must be connected. The grounding on these machines is extremely important Thanks, I wait for advice