I have used these to hang traveling cables under elevators. BTW, these cables are replaced occasionally due to open wires, mechanical damage or modernization and might be something you experimenters could use. They typically have nearly 100 stranded wires from 18 gauge to 14 gauge, color coded or numbered. I even used one to run power to my garage and welders by putting it in PVC pipe and bundling wires in groups. I guess there aren't too many high rise elevators in your neck of the woods though! Check with an elevator company if you visit a city. Some just toss them in the dumpster.