I am planning on using a 9 core wire to control 8 solenoid valves. 8 for the positive and the 9th for the common return. This is my first time ever using multiple positive wires with a common return and I thought of this scenario to which I cannot find an answer: If I have 24v 1A on the eight positive wires active at the same time, will I need to make sure the return is good for 8A or 1A? Does it even matter? Or am I missing a concept completely?