Section 4
SEC. 4. All apparatus and appurtenances used by the grantee or used thereafter by his successors or assigns shall be modern and first class in every respect, and the electric transmission 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 shall be stretched so as not to interfere with the free use of said public streets and thoroughfares: Provided, That the grantee, his successors or assigns herein shall, whenever the Philippine Legislature or its successors so direct, place said electric transmission wires in underground pipes or conduits at their own expense and without any cost or damage to the municipality of Naga.