The deployment efficiency of a large group of anodes is equal to the product of the deployment efficiencies of the small anode groups comprising the large group. This relationship allows the calculation of deployment efficiencies of very large anode groups. From established relationships of anode deployment efficiency and comparative resistance, the resistance of very large groups of impressed current or galvanic anode beds can be accurately calculated. Clustering of anodes is a useful approach to increase galvanic anode life when low resistivity soils are encountered.

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