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I bought several colors of high-quality, 16-gauge wire with 600v, 105*C insulation. Nylon spiral wrap is the best way to armor the wire and should be used anywhere it is near a rough surface, sharp edge or is wire-tied to anything else. Spiral wrap can also be used to bundle wires into a harness, but split-sleeve loom can be faster and allows wires to be added or removed in the future. The downsides are it's bulky and ugly and requires wire ties or electrical tape to hold it in place on the harness and control where wires enter and leave it. Zip-Tie(R) is a trademarked brand name for a particular style of nylon wire tie. I prefer made-in-U.S.A., Thomas & Betts wire ties to the cheap, made-in-China kinds often available in bulk selections. Material quality and dimensional control cost a little more but matter in the long term.