# CP Design Center

## Anode Resistance to Earth

### Single - Multiple - Vertical - Horizontal

 Anode Resistance to Earth Soil Resistivity = ohm-cm Anode Length = feet Anode Diameter = inches* Multiple Anodes  (Leave blank for single anode configuration) Number of Anodes = Anode Spacing = feet Horizontal Configuration  (Leave blank for vertical anode configuration) Anode Depth = feet** Resistance = ohms
 This calculator can be used to calculate resistance of anode to coke breeze or resistance of coke column to earth. When used to calculate resistance of coke column to earth, the result may be a reasonable approximation of total groundbed resistance; however, factors such as cable resistance and anode to coke resistance are not included. *  The program converts inches to feet. ** Anode depth is doubled by the program

Single Vertical Anode
Formula Used:
 Where R = resistance in ohms L= anode length in feet d = anode diameter in feet = resistivity in ohm-cm ln is the natural logarithm function N = the number of anodes = 1
Multiple Vertical Anodes in Parallel
Formula Used:
 Where R = resistance in ohms L = anode length in feet N = the number of anodes S = anode spacing in feet d = anode diameter in feet = resistivity in ohm-cm ln is the natural logarithm function
Multiple Horizontal Anodes
Formula Used:
 Where R = resistance in ohms L = anode length in feet S = twice the depth of anode in feet N = the number of anodes d = anode diameter in feet = resistivity in ohm-cm ln is the natural logarithm function