86 Height and depth of telecommunication lines 10.(1) Aerial telecommunication wires and cables shall be carried over land at such height from the surface of the ground as may be prescribed. (2) An underground telecommunication line that is not carried in a pipe or duct shall be placed such distance below the surface of the ground as may be prescribed. (3) If the owner or occupier of any land is obstructed in the use of the land because a telecommunication line is insufficiently high, the licensee concerned shall, subject to paragraphs 5 and 7, take such steps as may be necessary for the removal of the obstruction. Acquisition of right or interest in Communal Land 11. Notwithstanding anything to the contrary in this Schedule, no right over or interest in Communal Land shall be acquired, whether compulsorily or by agreement, otherwise than in accordance with the Communal Land Act [Chapter 20:04]. Licensee to authorise persons for purposes of Third Schedule 12. The licensee shall furnish every person authorised by him to exercise any of the powers conferred by this Schedule with a certificate signed by or on behalf of the licensee stating that the person has been so authorised, and such person shall produce such certificate at the request of any person affected by the exercise of the said powers.