Fire Alarm Control Panels - Bosch Security Systems

34 en | Connection Fire Alarm Control PanelsFigure 5.8: Transformer ConnectionsPrimary:YE yellowWH whiteBK black5.3Option bus wiring requirementsUse 18 AWG (1.2 mm) or larger wire to connect option bus devices to the FACP. The totallength of wire connected to the option bus terminals must not exceed 4 000 ft (1 219 m),regardless of the wire gauge wire used.iNotice!Shared cable is not recommended for option bus, addressable points bus, telephone, or NACwiring.iNotice!To comply with UL, do not share supplementary devices with primary device on the optionbus.Avoid shielded or twisted pair-wire except for special applications where a reduced length ofwiring (approximately 50%) is acceptable for tolerating a harsh electrical environment.The length of wire allowed between the control panel and the last device on a wiring rundepends on the existing current draw on that wiring run. Reducing the number of devices on awiring run allows the individual runs to be longer.2012.08 | 04 | F01U008458 Installation and Operation Manual Bosch Security System, Inc.