34 www.megger.comexample, the distance for C must be increased to possibly 200 ft, and for P to some 125 ft. You’ll need even greater distance for complex electrode systems that consist of a large number of rods or plates and other metallic structures, all bonded together. For an earth electrode system covering a large area, refer to Appendices II and III for additional techniques.Table I is a useful guide to reference probe location. You find the “Maximum Dimension” figure by taking the diagonal distance across your Table II: Guide to approximate location of reference probes (see Note 1)
