Rating of cables in relation to voltage historical summary

E. B. Meyer: As already stated by one of the writers, the general opinion in the past seemed to be that when the voltage of a circuit was increased the only requirements so far as safe operation was concerned, was to add more insulation to the cable. Recent experience and research has developed the fact that the quality of the insulation and of the compounds used for impregnation have an important bearing on the safe operation of underground cables.