Section 4
SEC. 4. All apparatus and appurtenances used by the grantee shall be modern, safe, and first class in every respect. All wires shall be carefully connected, fastened, and insulated, and the grantee shall, whenever the Public Service Commission or its legal successor shall determine that the public interest reasonably requires it, place said wires in underground pipes or conduits at its own expense, and without any cost or prejudice to the municipality. The poles erected by the grantee shall be of such a height as to maintain the wires stretched on the same at a distance of at least twenty feet above the level of the ground, and shall be of such appearance as not to disfigure the streets, and shall be placed with due regard for the public safety, in accordance with a plan previously approved by the municipal authorities concerned.