Provides specific information on application, properties and performance of these systems and associated equipment and on precautions to be taken in order to ensure that PLC radiations do not interfere with other radiocommunication services. Several tables give details as to typical values for the effectively transmitted band for a one-way single channel, typical corona noise power levels, typical average impulse-type noise levels, the allocation of transmitter power in multipurpose situations, the additional loss for various line configurations and optimum coupling arrangements and include a list of instruments suitable for PLC testing.