Of course one of the major requirements in wiring is to choose the correct wire type - single wire, shielded wire, twisted-pair, or shielded-twisted-pair, appropriate for the function at hand, making sure that your wiring runs don't place high-level signals adjacent to low-level signals, planning for a good single-point ground system, and showing where the shields get terminated on each shielded run, both ends, receiving end, or transmitting end. You must also plan this layout to decompose a wiring bundle to aid in trouble shooting when you have your head under the panel with your back on the floor and your legs up over the seat backs. 'Ever wondered why an engine designer would make it necessary to remove the intake manifold to replace plugs or injectors? You are now taking the place of that designer! You can have the most beautiful wiring layout with everything so nicely laced or clamped, having incredible schematics for trouble shooting, and with each wire tagged with some reference designation, but if your electrical planning doesn't show an excellent knowledge of ground loops and have a large dose of common-mode and RFI-EMI smarts embedded in it, its beauty will be like that of Liz Taylor but accompanied by her screeching and irritating voice. These are the practical things that separate a beautiful, theoretical wiring system from a useful one!
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