Interference from the Voltage Cone of Anodes

Experience shows that in interference by the anodic voltage cone, no unacceptable anodic interference is caused by an interference voltage Uy 0.5 V versus the remote ground. The distance from the impressed current anode at which Uy = 0.5 V depends on the anode voltage, U/y, and the anode length, L [13]. It amounts to  

No damaging interference to foreign objects has to be considered in cathodic protection with galvanic anodes because of the small current densities in soil and the lower anode voltages. 

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