This one the ways ensure that you don’t
waste money over-dimensioned rods.5% by
doubling the diameter the rod (which means
increasing the weight and the cost the rod by
approximately 400%).–
Effect electrode diameter resistance
Diameter rod
One common misconception that the diameter
of the rod has drastic effect lowering earth
resistance. This not true! the graph shows,
you only lower the resistance value 9.
Rod
Diameter
100%
0%
1/2” 3/4” 1/4” 1/2” 3/4” 2”
80%
60%
40%
73
.
Thus the rationale is: Use the most economical
rod that soil conditions will allow you drive
