If you use the "search" button near the top of this page, and put in "cable AND calculations" or "Cable and calcs" (or resistance, or whatever) you will find some useful pointers. Have a browse thropugh the existing stuff and see what remains.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
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