Earthing of low- and medium-voltage distribution systems and equipment

The paper states briefly the reasons for earthing low- and medium-voltage distribution systems and equipment. Reference is made to various methods of earthing and to the main difficulties encountered in putting them into practice, particularly in rural areas. The main objects are to describe the development of the system known as protective multiple earthing, to show the advantages of this system and to explain the reasons for its adoption on a wide scale in the rural zones served by the North Western Electricity Board. The experience of the Board with the p.m.e. system from 1949 onwards is described.