If power line carrier communication is used for signal transmission through the power conductor itself then only wave trap is required to filter out the noises. To sectionalize the transmission network and protect against failures, a "wave trap" is connected in series with the power (transmission) line. They consist of one or more sections of resonant circuits, which block the high frequency carrier waves (24 kHz to 500 kHz) and let power frequency current (50 Hz – 60 Hz) pass through.
If power line carrier communication is used for signal transmission through the power conductor itself then only wave trap is required to filter out the noises.