Digital Ground Resistance Tester Model 3640 and 4610
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4.4.1 Auxiliary Electrode Spacing
NodenitedistancebetweenXandZcanbegiven,sincethisdistanceis
relativetothediameteroftheelectrodetested,itslength,thehomogeneity
of the soil tested, and particularly, the effective resistance areas. How-
ever,anapproximatedistancemaybedeterminedfromthefollowingchart
whichisgivenforahomogeneoussoilandanelectrodeof1"indiameter.
(Foradiameterof1/2",reducethedistanceby10%;foradiameterof2"
increasethedistanceby10%.)
Depth Driven Distance to Y Distance to Z
6 ft 45 ft 72 ft
8 ft 50 ft 80 ft
10 ft 55 ft 88 ft
12 ft 60 ft 96 ft
18 ft 71 ft 115 ft
20 ft 74 ft 120 ft
30 ft 86 ft 140 ft
Approximate Distance to Auxiliary Electrodes
Using the 62% Method
Table 6
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