scope:

This publication applies to radio noise from overhead power lines and high-voltage equipment which may cause interference to radio reception, excluding the fields from power line carrier signals. The frequency range covered is 0.15 MHz to 300 MHz. This publication has been prepared in order to provide information on the many factors involved in protecting the reception of radio and television broadcasting from interference due to high voltage overhead power lines and associated equipment. The information given should be of assistance when means of avoiding or abating radio noise are being considered. The publication does not deal with interference due to the fields produced by power line carrier signals. Information is mainly given on the generation and characteristics of radio noise from a.c. power lines and equipment operating at 1kV and above, in the frequency ranges 0.15 MHz to 30 MHz (a.m. sound broadcasting) and 30 MHz to 300 MHz (f.m. sound broadcasting and television). The special aspect of spark discharges due to bad contacts is taken into account. Some information is also given on interference due to d.c. overhead lines for which corona and interference conditions are different from those of a.c. power lines. Interference due to the current collecting equipment of overhead railway traction systems is not included.