loops as shown in figure can produce high inductive voltage drops which can cause a lightnihg discharge to pass through a
structive wall, thereby causing damage ,if the condition deduced from equations and are not met, arrangements should be made for direct routing through the structure at the points of re-entrant lightning conductor loops for those conditions shown in figure
joint, connections and test joints in down-conductors
air-terminations and down-conductors should be firmly fixed so that electrodynamics or accidental mechanical forces (vibrations,slipping of slabs of snow, thermal expansion, and so on)will not cause conductors to break or loosen,
the number of connections shall be made secure by such means as brazing, welding, clamping,