Proximity Effect in Cable Sheaths

The electrical characteristics of the lead sheaths of underground cables can be calculated by the methods used for computing proximity effect. Theoretically, any group of round wires and thin tubes can be calculated. Cases which are taken up in this paper are (1) a thin tube and an enclosed wire, (2) the current density, voltage drop, and power loss in the sheath of a three-conductor cable, (3) two single-conductor cables with the sheaths open-circuited, (4) two single-conductor cables with the sheaths short-circuited, and (5) three single-conductor cables in a plane.