(1) Due to the large outer diameter of the wire and cable, it is difficult to transport and lay, and the requirements for the turning radius are relatively strict. In the construction, if the turning angle is too large, the inside of the conductor may be mechanically damaged, and the mechanical damage will reduce the insulation strength until failure occurs. During the construction process, the torsion force should be reduced as much as possible. When turning and leaving, Let it be in natural bending to prevent internal mechanical damage.

(2) In the public medium and low-voltage power wire and cable network, because the three-phase load is not equal, if a metal sheath is used, the grounding problem of the metal sheath must be considered, and it should be ensured that the metal sheath is not grounded at any point The normal induced voltage shall not be greater than 100V.

(3) In the construction of power wires and cables, some steel supports are used, and some steel protection pipes are used. Any steel (iron) closed circuit formed around them may form eddy currents, especially in large currents. In the power system, the eddy current is larger. During construction, measures must be taken to prevent a steel (iron) closed circuit from being formed around it to prevent the occurrence of eddy currents.