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A power line carrier system, which operate between 10 kHz and 490 kHz, is a carrier current system used by an electric public utility entity for protective relaying, telemetry, etc., for general supervision of the power system.
A carrier current system operated by an electric utility to control the utility’s electrical grid is defined as a power line carrier system in the rules. Power line carrier systems are not subject to specific emission limits as are carrier current systems.