The methods of measurement detail the techniques and procedures foruse when measuring fields on site near to an overhead line and alsothe techniques and procedures for making laboratory measurements ofinterference voltages and currents generated by line equipment andaccessories.The procedures for determining limits define the expected values ofradio noise field and the width of the "disturbed corridor"following the route of the line. This corridor takes into accountthe effective field strength of the wanted signal, thesignal-to-noise ratio selected and the expected strength of thenoise field for a given line. The procedures are valid only forlong and medium waves.