Initiating Device Circuits, Signaling Line Circuits, and Detection Systems

Designed for aspiring and practicing life safety technicians, this course provides comprehensive training on the input infrastructure of modern fire alarm systems. Students explore the physical architecture, operational theory, and performance criteria of conventional Initiating Device Circuits (Class A and Class B) alongside advanced addressable Signaling Line Circuits (Class A, Class B, and Class X). The curriculum covers the selection, placement, spacing, and wiring of automatic detectors—including optical, thermal, duct, multi-criteria, and specialty sensing technologies—as well as manual fire alarm boxes and supervisory switches. Emphasis is placed on circuit calculations, end-of-line resistance, fault isolation, and troubleshooting electrical opens, shorts, and ground faults using standard diagnostic instruments. Through rigorous laboratory exercises and a culminating capstone service project, learners develop the practical field competence required to install, verify, and maintain reliable initiating pathways in compliance with prevailing life safety standards.

InstructorJacob Calhoun

Prerequisites

FAS 101

Course outline

Lectures, virtual labs, and graded assignments — completed in your browser.

01Lesson 1: Introduction to Initiating Pathways and Contact-Type Deviceslecture

02Lesson 2: Conventional Initiating Device Circuit (IDC) Architectures and End-of-Line Supervisionlecture

03Lesson 3: Manual Fire Alarm Boxes, Waterflow Switches, and Supervisory Deviceslecture

04Hands-on Lab: Hands-On Lab: IDC Wiring, Termination, and Fault Diagnosislab

05Lesson 5: Signaling Line Circuit (SLC) Fundamentals and Addressable Communicationlecture

06Lesson 6: Spot-Type Smoke Detectors: Optical, Ionization, and Multi-Criteria Technologieslecture

07Lesson 7: Thermal Detectors, Linear Heat Sensing, and Gas Initiating Deviceslecture

08Hands-on Lab: Hands-On Lab: Addressable SLC Layout, Device Addressing, and Circuit Verificationlab

09Lesson 9: Duct Smoke Detectors, Sampling Tubes, and Specialty Detection Applicationslecture

10Lesson 10: Pathway Survivability, Fault Isolator Modules, and Class X Wiringlecture

11Hands-on Lab: Hands-On Lab: Fault Isolator Installation, Ground Fault Locating, and Meter Diagnosticslab

12Lesson 12: Initiating Circuit Resistance Calculations, Voltage Drop, and Conductor Sizinglecture

13Lesson 13: Detector Acceptance Testing, Sensitivity Verification, and Documentation Standardslecture

14Capstone Service Project: Comprehensive Initiating System Commissioning and Fault Troubleshootingassignment

Syllabus

["Week 1: Lesson 1: Introduction to Initiating Pathways and Contact-Type Devices", "Week 2: Lesson 2: Conventional Initiating Device Circuit (IDC) Architectures and End-of-Line Supervision", "Week 3: Lesson 3: Manual Fire Alarm Boxes, Waterflow Switches, and Supervisory Devices", "Week 4: Hands-on Lab: Hands-On Lab: IDC Wiring, Termination, and Fault Diagnosis", "Week 5: Lesson 5: Signaling Line Circuit (SLC) Fundamentals and Addressable Communication", "Week 6: Lesson 6: Spot-Type Smoke Detectors: Optical, Ionization, and Multi-Criteria Technologies", "Week 7: Lesson 7: Thermal Detectors, Linear Heat Sensing, and Gas Initiating Devices", "Week 8: Hands-on Lab: Hands-On Lab: Addressable SLC Layout, Device Addressing, and Circuit Verification", "Week 9: Lesson 9: Duct Smoke Detectors, Sampling Tubes, and Specialty Detection Applications", "Week 10: Lesson 10: Pathway Survivability, Fault Isolator Modules, and Class X Wiring", "Week 11: Hands-on Lab: Hands-On Lab: Fault Isolator Installation, Ground Fault Locating, and Meter Diagnostics", "Week 12: Lesson 12: Initiating Circuit Resistance Calculations, Voltage Drop, and Conductor Sizing", "Week 13: Lesson 13: Detector Acceptance Testing, Sensitivity Verification, and Documentation Standards", "Week 14: Capstone Service Project: Comprehensive Initiating System Commissioning and Fault Troubleshooting"]