Electric utilities are under increasing pressure, from governmental authorities and the public, to help preserve environmental beauty by installing all or part of their power distribution systems underground. They and their apparatus suppliers, however, face a serious corrosion problem in the design and application of equipment for underground residential distribution (URD) systems, if present standards of service reliability are to be maintained. Conventional approaches to the general problem of protecting submerged, nonhomogeneous structures are not necessarily effective here, as will be shown, because of the characteristics of these systems.

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