A method for operating an electrical installation system 1 is described. This installation system comprises at least one extension NS that is wired to a main station HS provided for controlling at least one actuator A. The main station HS can be controlled via the extension NS. To control the main station HS by the extension NS, control commands are voltage-coded onto an electrical line 2 connecting the extension NS to the main station HS into one or more consecutive similar AC half-wave command half-waves. The other AC half-wave, which is not used for the transmission of the control commands from the extension NS to the main HS - the feedback half-wave - is used to transmit data from the main HS to the extension NS by voltage-coding the information to be transmitted to the extension NS into the Feedback half-wave is impressed.
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