This Standard establishes limits for electromagnetic interference (radio disturbance) from alternating current (a.c.) overhead powerlines and high voltage equipment installations in the frequency range 0.15 to 1000 MHz. The limits are specified in accordance with geographical zones and coverage areas. Australia and New Zealand are situated in Zone 3 and various coverage areas within those zones are in accordance with Figure 1. These limits are specified for the protection of broadcast radio reception and other radio communication services, including navigation and safety-of-life services.The limits assume the powerlines and equipment installations have a defined corridor or boundaries within which radio reception cannot be guaranteed and where special measures may be taken.Outside these boundaries, a satisfactory level of reception, as defined by the International Telecommunication Union (ITU), can be expected.Limits for single components of powerlines and equipment installations are under consideration.ApplicationThis publication applies to a.c. powerlines and high voltage equipment installations used in power systems for the generation, transmission and distribution of electric energy.Compliance of individual system components to the limits stated for these components does not imply compliance with system limits. However, the compliance of a component with its respective limit is a guide to the likely performance of the component when incorporated into a power system and a quantitative measure of electromagnetic interference quality for design and contractual purposes.The limits set down herein are achievable by powerlines and high voltage installations with components in good working condition. Radio disturbance generated by faulty components (i.e. bad contacts or cracked insulators) may be expected to exceed these limits.