Section 4
SEC. 4. All apparatus and appurtenances used by the grantee or hereafter used by his successors or assigns shall be modern and first-class in every respect, and the electric wires shall be insulated and carefully connected and fastened so as not to come in direct contact with any object through which a "ground" could be formed, and the wires conducting electricity shall be stretched so as not to interfere with the free use of said streets and public thoroughfares: Provided, That the grantee and his successors or assigns herein shall, whenever the Philippine Legislature or its successors so direct, place said wires conducting -electricity in underground pipes or conduits at their own expense and without any cost or damage to the municipality of Tabaco.