66 F. the varying, exclusion or substitution, with the agreement of a person to whom a telephone or a telex service or facilities connected therewith are afforded or by whom such a service or facilities are used, of any provision prescribing a condition or relating to a matter referred to in subparagraphs A to E in respect of the supply to him or the installation, maintenance, working, repair or use of apparatus or equipment by him or on his behalf or at his request; (i) the protection from interference or injury by works and lines for the supply of electricity of telecommunication systems established, maintained or worked by a licensee and by persons authorised in terms of this Act to establish, maintain or work telecommunication systems, and in so doing provide for the varying, exclusion or substitution, with the agreement of a person by whom such works or lines are established or operated, of any regulations providing for the protection of such telecommunication systems from interference or injury which may be applicable to the person; (j) the giving of such access to buildings and the furnishing of such places, facilities and fittings in buildings by the owners of buildings as may be necessary for the purpose of installing, maintaining and repairing apparatus and equipment used or to be used in connection with telecommunication systems within the building; (k) such matters as the Minister may consider appropriate or necessary to give force and effect, within Zimbabwe, to the provisions of the International Telecommunication Constitution and the Constitution of the Universal Postal Union; (l) the classification of radio stations, other than broadcasting stations and radio stations used solely in connection with broadcasting and diffusion services, and in so doing amend the First Schedule or vary the definition of a radio station specified in the First Schedule and prescribe the nature of the radiocommunication services to be carried on therefrom; (m) the inspection and testing by employees of broadcasting stations, licensed radio stations and radio stations and radio and other apparatus used in connection with broadcasting services or systems and for the method of installation, working and maintenance thereof; (n) the establishment, maintenance, protection, working and conduct of all or any radiocommunication service established, maintained or carried on by a licensee, whether in conjunction with a telecommunication service or system or otherwise; (o) the prohibition, restriction or control, by licence or otherwise, of the importation, purchase and sale of any apparatus capable of causing harmful interference; (p) ensuring that— (i) the use of generating apparatus or power lines does not cause harmful interference and in so doing prescribe the conditions to be observed with respect to— A. the maximum intensity of electromagnetic energy of specified frequencies which may be radiated in any direction from generating apparatus or power lines when in use;