Section 4
SEC. 4. All apparatus and appurtenances used by the grantees or thereafter by their successors or assigns shall be modern and first class in every respect, and the electrical transmission wires shall be insulated and carefully connected and fastened so as not to come in direct contract 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 streets and public thoroughfares, nor cause any injury to the public, danger of fire, or damage and inconvinience to the owners of property: Provided, That in the maintenance and operation of their plant and system for the transmission and distribution of electric current, the grantees shall always be subject to such reasonable regulations as the municipal council of Sorsogon and the provincial board of Sorsogon may promulgate in the premises, and also to the regulations prescribed by the National Electrical Code of Fire Underwriters Rules of America: Provided, further, That the grantees and their successors or assigns shall, whenever the Philippine Legislature or its successors, upon recommendation of the Public Utility Commission or its legal successors, so direct, place said wires in underground pipes or conduits at their own expense, and without any cost or prejudice to the municipality of Sorsogon.