Current distributions during electroptating within a tubular electrode were studied. A theoretical model was developed taking into account the various factors influencing the current distribution: metal electrode resistance, electrolyte phase resistance, mass transfer resistance, charge transfer resistance, as well as geometrical parameters and the applied potential. The model enables the prediction of the relative importance of each of these factors in obtaining uniform current distribution inside the holes. Criteria for obtaining uniform metal thickness inside holes based on limiting values of four dimensionless parameters are presented and discussed.