In the paper, a numerical analysis of the electromagnetic influence of the two-system cable connection 110 kV Pehlin – Turnic on nearby telecommunication lines was carried out. It is a two-system cable connection where on parts of the route there are as many as four cable systems in a common cable channel, which during the occurrence of a single-pole short circuit in the associated 110 kV network electromagnetically influence each other and exert an electromagnetic influence on nearby telecommunication lines as well .