Co-ordination of power and communication circuits for low-frequency induction

WHERE power and communication facilities are in proximity, electromagnetic induction from the power system may cause disturbances in the communication system. The avoidance or minimizing of such disturbances, with due regard to the service and other needs of both systems, is a problem of co-ordination, which is conveniently divided into two parts, one dealing with low-frequency inductive co-ordination and the other with noise-frequency co-ordination.