1. Where a power line crosses a proclaimed road, railway or tramway or a communication line proclaimed by the Postmaster General, the supplier or user shall cause the clearance to comply with the requirements of regulation 15 and shall further cause -
a. every structure supporting a crossing span to be designed in such a manner that it will be able to withstand the loads that may be imposed upon it should a breakage of any phase conductor or earth conductor occur;
b. every structure supporting a crossing span, as far as is reasonably practicable, to be located so that it will not touch the service crossed, should it overturn;
c. subject to the restrictions in paragraph (b), one of the structures supporting a crossing span to be located as close to the point of crossing as is reasonably practicable;
d. the clearance of the crossing span where it crosses a proclaimed road to be not less than 4.5 m in the case of a broken phase conductor in a span other than the crossing span;
e. armour rods or arching horns to be fitted at the live ends of suspension and rigid insulators on at least the first three structures on each side of the crossing if the maximum voltage for which the power line is designed exceeds 1.1 kV r.m.s.; alternatively, duplicate conductors, tied together at intervals of not more than 1.5 m shall be provided in the crossing span and shall be supported by duplicate parallel insulators, and for lines on rigid insulators the duplicate conductors shall extend at least 1.5 m beyond the supports on each side of the crossing span;
f. the deviation from a right angle crossing over a communication line of the Department of Posts and Telecommunications or the South African Transport Services to be not greater than 30 degrees for lines with a voltage of 48 kV r.m.s. and above, and not greater than 45 degrees for lines below 48 kV r.m.s.; and
g. the clearance to comply with the requirements of regulation 15 and with paragraphs (b) and (c) of this subregulation in cases where a power line crosses another power line:
h. Provided that the chief inspector may approve any deviation of these requirements as specified in this subregulation subject to such conditions as he may determine.
2. The supplier or user shall cause every overhead service connection which crosses over bare communication lines of the Department of Posts and Telecommunications to have minimum clearances between the overhead service connection and the communication lines at the points of crossing of 0.5 m and the overhead service connection shall not cross below bare communication lines.