The growth of the number of the non-linear elements in public distribution networks, leads to an ascent of the harmonic pollution. Economically, the presence of the harmonics determines a growth of the operating costs. Unanimously is accepted the fact that the disturbing state in urban distribution networks can not be avoid because most of the appliances, public lighting, a.s.o use non-linear elements of circuit. In present, with the help of the Alpha Power Plus meters the non-sinusoidal state in public distribution networks can be identified and thus can be substantiated the solutions to diminish its effects.