This report is intended to provide information regarding the application of power line carrier systems to electricity supply networks and to provide specific information on the properties and the performance of power line carrier (PLC) systems and associated equipment useful to the systems planning engineer, and on the precautions to be taken in order to ensure that PLC radiations do not interfere with other radiocommunication services. Figure 1, page 60, illustrates the associated I E C standards for PLC-Systems. As single-sideband (SSB) systems are now almost universal, the report is concerned with amplitude modulated systems of this type, however other types of system such as doublesideband and frequency modulated systems exist as described in Sub-clause 4.5.1.