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  1. AC and DC cable resistance.

    (Knowledge base)

    ... effect decreases with increase in spacing between cables. Mathematical treatment of these effects is complicated because of the large number of possible variations. Skin and proximity effects may be ...

  2. Corrosion cells and principles of corrosion.

    (Knowledge base)

    ...  localised anodic and cathodic areas arise on the surface of the same metal through differences in the metal itself, variations in protective films or changes in the electrolyte. ie: aeration, temperature ...