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 MIL-HDBK-419A
2.6.2.4 Vertical Rods Connected by a Grid. The resistance of a bed of vertical rods, interconnected with a
wire grid is (2-10)
(2-29)
where
= resistance of wire grid as given by Equation 2-27
= length of conductors in grid
= resistance of bed of rods, as found from Figure 2-12
= mutual resistance which accounts for interaction
of rods on grid
(2-30)
, or
(2-31)
where
= radius of grid wire,
= depth of grid, if buried, and
= length of rod, if the grid is near surface.
2-30
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