Research conclusions：Single conductor cables in 10kV power run-through lines are better to be arranged as an equilateral triangle. The effect of catenary currents should not be neglected when calculating the induced voltage of the metallic sheath. The two ends of the metallic sheath in the single conductor cable shall not be earthed directly. For the cable length up to 2 km, it is grounded with one end direct earthing and the other end protective earthing. Middle direct grounding-two ends protective grounding method can be adopted if the cable length is about between 2 km and 4 km. Metallic sheath cross connection method is advised when the cable length is longer than 4 km.