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ANSI/IEEE Std 80-1986 presents the essential guidelines for assuring safety through proper grounding in AC outdoor substations, either conventional or gas-insulated. These include distribution, transmission, and generating plant substations. With proper caution, the methods described are also applicable to indoor portions of such substations, or to substations that are wholly indoors. Major modifications in this third edition 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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