BICSI OSP Design Practice Test

Bonding aerial strands at intervals creates a continuous, low-impedance path that keeps the entire span at the same electrical potential and provides a dependable route for fault currents and lightning surge energy. At each crossover, potential differences can arise if the strands aren’t tied together; at branches, the side strand must join the same ground system; and at the beginning and end of a section, bonding ensures the span between supports remains bonded throughout. The 0.4 km (0.25 mile) spacing is chosen to keep the impedance between bond points small enough to rapidly equalize potentials. With all these locations bonded, the system remains protected and conductive paths stay intact, so bonding at all of these points is required.