Earthed & Unearthed System

A number of electrical systems have been operated unearthed at one or more voltage levels. This is basically guided by the thought of gaining an additional degree of service continuity varying in its importance depending on the type of plant. Earthed systems are in most cases designed so that circuit protective devices will remove the faulty circuit from the system regardless of the type of fault. However, experience has shown that in a number of systems, greater service continuity may be obtained with earthed neutral than with unearthed neutral systems.