In non-uniform network the ratio of reactance to resistance is not the same for all branches. As a result, in closed networks the extra losses appear. The losses can be found in a trivial way: as the difference between the losses in the studied (non-uniform) Z-network and the losses in the same network but without branch reactance (uniform R-network). If the extra losses are considerable the measures must be undertaken to eliminate these losses. To do it, one of the measures is to insert opposing voltages in independent loops of the network which can be done if circulating currents (CC) in the loops are known. These CC can be defined using special CC matrix. Extra losses in meshed networks can be found also as a sum of products of square of the CC modules in each branch by resistance of this branch. Calculating the losses using circulating currents, the detrimental places in the networks can be found. In common for two loops branch, the CC equals to the sum of CC in these branches. Concept of non-uniformity factor is introduced to foresee the possible extra losses in non-uniform meshed networks. The scaling factor is introduced to facilitate the calculations.