Abstract
THE occurrence of lightning over–voltages on underground cables is ordinarily supposed to be impossible except when a cable is connected to an overhead line. In this case surges initiated in the latter may be propagated into the cable. In a recent paper by Dr. H. Einhorn and Prof. Goodlet of the University of Cape Town*, new facts are adduced which prove that the ordinary opinion is untenable. They describe some curious faults on underground telephone cables experienced during the lightning season in the vicinity of Johannesburg which cannot be explained in the general way. Briefly described, breakdowns occurred between the outer cores and the lead sheath and armouring of telephone cables buried to depths up to three feet in dry sandy soil. All the faults occurred during the lightning season, and faults were most frequent in the worst storm areas traversed by the cables.
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