I have multiple solenoid valves I want to supply control power via a multi conductor cable. Each valve draws .8 amps at 120v. I could use 22awg size wire in my cable for the wires operating each valve. My question is about the common wire. Since that wire is common to all the valves will I have to size my wire based on the current running through that wire? Am I correct in thinking that if all four solenoids were active at once then the common wire would be carrying a load of ~4 amps? (4 sol x .8 amps each) so the common wire would need to be sized at 18awg? This sounds like such a novice question I know. Any help would be appreciated!