CTM4.7 The CTM4.7 City Tie Module is an interface between the control panel notification appliance circuit and a master box. It provides off-premises signal transmission for systems that must comply with NFPA requirements for Auxiliary Protective Systems. The CTM4.7 activates a local energy fire alarm box, which provides a 24VDC alarm signal (current limited at 200mA). The 4.7 K ohm end of line resistor required by the NAC is built in to the CTM4.7. Mounts in a 1 gang electrical box.

RPM The Edwards RPM Reverse Polarity Module is an interface between FireShield and a reverse polarity receiver. It provides off-premises signal transmission for systems that must comply with NFPA requirements. When used as a reverse polarity remote station or central station transmitter, it can be connected to either a single circuit (alarm, or alarm and trouble) or to up to three circuits (alarm, supervisory, and trouble). The RPM must be mounted in an MFC-A enclosure immediately adjacent to the panel and in conduit.