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In the paper presents compares the DC conductivity of the insulating oil manufactured by Nynas and electrical pressboard Pucaro companies impregnated with the same insulating oil with different moisture contents. The study of conductivity for both materials were made for the measuring temperature in the range of 20 degrees C to 80 degrees C and measuring voltages in the range from 20 V to 1000 V. In the Arrhenius plots for both materials were been performed linear approximations of experimental results. On the basis of Arrhenius plots for the oil and the sample for the pressboard, for all measuring voltages, the value of the activation energy value of the DC conductivity and the determination coefficient R-2 was determined. The value of the determination coefficient close to one indicates the high accuracy of conductivity measurements. Comparing the activation energy value of the DC conductivity for insulating oil and pressboard impregnated with the same oil, it can be concluded that the conduction in pressboard is not caused by the presence of oil in the solid component of the paper-oil insulation
