Quantcast Buried Vertical Rod

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MIL-HDBK-419A
2.8.1.2.2 Buried Vertical Rod. If the single isolated vertical rod is driven so that the top of the rod is below
the surface, the maximum step voltage on the surface of the earth is reduced. Figure 2-22 shows the surface
voltage variation for a flush driven rod compared with that for a rod with its top below the surface. Maximum
gradient for the flush driven rod is at the vicinity of the rod. Maximum gradient for the rod sunk into the earth
to a depth of h feet occurs at a distance of 3 h to 4 h from the rod (2-3). The step voltage for the rod driven so
that its top is h feet below the surface is:
If h = 3 f e e t , t h e m a x i m u m s t e p v o l t a g e i s a p p r o x i m a t e l y
instead of 41,400 volts, which was characteristic of the flush-driven
rod.
2-53





 


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