Reference · Circuits & Power
Signaling Line CircuitSLC
The addressable data loop of an analog/addressable system. Each detector, module and pull station has an address, so the panel knows exactly which device is in alarm and can read smoke sensitivity values. Isolators limit the effect of a short.
NFPA 72: Chapter 12, Chapter 23
Section numbers vary by edition — confirm in the edition your AHJ has adopted.
Read more in these guides
Fire Alarm Wiring & Circuits, SimplifiedCircuit type, class, and pathway integrity decide whether a system keeps working when a wire is damaged. Here's the plain-language version.Fire Alarm System Design BasicsUnderstand the building blocks of fire alarm system design and how a good layout turns detection into fast, clear notification.