Description: The third edition of this guide represents the first major revision since its first issue in 1961. Major modifications include the redefinition of simplified equations for calculating touch and step voltages, changes in safety criteria, and expansion of examples illustrating the use of this guide. Other changes and additions concern a section on gas-insulated substations, introduction of a derating factor for crushed stone surfacing, the effects of ground rods, equations for calculation of grid resistance, current division among available ground paths, sizing of conductors of various materials, and discussion of multilayer soil models.
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