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 MIL-HDBK-419A
When the step length is much less than the rod length, i.e., when
the step voltage can be approximated
as
(2-59)
The step potential can be expressed as a fraction of the ground rod potential as follows:
(2-60)
The fractional step voltages for ground rods of various length are given in Table 2-7. For this Table, rod
diameter is assumed to be one inch (2.54 cm) and the pace length is assumed to be three feet (0.91 m).
Table 2-7
Step Voltages for a Buried Vertical Ground Rod
Ratio of Step Voltage
Rod Length
To Electrode Potential
(Ft)
0.75
5
0.68
10
0.61
20
0.53
50
0.48
100
2-50
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