These requirements cover the individual components that comprise a home health care system intended for use in ordinary indoor locations. These requirements cover a complete home health care system in which a signal initiating device (both routing monitoring and medical emergency signals) may be connected directly or indirectly to continuously-monitored receiving equipment at a residence or a central supervising station. The system is arranged so that a predetermined change in the status of the signal initiating circuits or devices automatically causes transmission of a signal over a communication channel to the central supervising station. The components of the home health care system may include signal initiating devices, control units, transmitters, and digital communicators, all located at the residence; and the receiving, processing, and displaying equipment located at the central supervising station. The units located at the residence are intended to be energized from power limited circuits as defined by Article 725 of the National Electrical Code, ANSI/NFPA 70, for Class 2 remote-control and signal circuits. The components covered by these requirements are intended to be installed in accordance with the requirements of (1) the National Elecrical Code, (2) other applicable installation codes, and (3) the local authority having jurisdiction.