In this thesis I examined the network effects of consumer solar panel systems and distributed generation, focusing on the possibility of overload on low voltage cables and thermal ageing effect. I looked for extreme load conditions in network models by analyzing the significant differences between the power generated by solar panels and the consumer profile. Knowing the sizes of cyclic overloads, the equilibrium temperature of the distributed cables can be determined. I created samples of cables and developed a cyclical ageing method for the laboratory measurements of the effects. The reason for the ageing is to model what happens when distributed cables exceed their operating temperature for a few hours, and this occurs cyclically. I used Shore D hardness measurement, for the measurement of the jackets of cable samples, and loss factor and insulation resistance measurements for the testing of electrical parameters. The thesis ends with the conclusions and description of the measurement results.