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The typical way to make the nice, neat bends that we see in control cabinet wiring is to grab the wire with needle-nose pliers and use a wrapping motion. You end up with a ninety degree bend on a slightly-rounded curve.
But such sharp bends in a neon system could prove disastrous, due to the higher voltages encountered. Consequently, you must avoid such bends in insulated conductors of these systems [600.32(5)(D). You can get a neat appearance with other means.
For example, you could determine the minimum bend radius for each conductor size at the nominal voltage and use an object over which you can bend the wires to that radius. This, however, will take some research and calculation. An easier approach would be to use wire looms to support the wires, and keep the bends as “open” as the space in the enclosure permits.
It’s worthwhile to see what products your electrical distributor has for dressing out wiring. Properly dressed wiring is a sign of excellent workmanship, something that’s beneficial to any job with your name on it.
You should be photo-documenting your completed work before installing the enclosure covers. If there’s a botched DIY job that you are subsequently blamed for, you can show “As Left.” And it will be clear from your properly dressed wiring that your work standards are high. That goes a long way in a liability trial.