Extension of conduits; ducts for use of fire and police wires; maximum price of current; additional charge for nonpayment of bills.

The Mayor of the District of Columbia is authorized to grant permits for the repair, enlargement, and extension, under proper regulations, of existing electric-lighting conduits, and in every conduit constructed or to be constructed under the provisions of this section, 3 ducts shall be reserved for the use of the United States and the District of Columbia.