Douglas Krantz - Technical Writer - Describing How It Works
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Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer


Frequently Asked Questions

The Signaling Line Circuit

  • 1 Just What Is a Signaling Line Circuit (SLC)?
  • 2 Are Addressable Fire Alarm Systems Different from Conventional Systems?
  • 3 What is the Difference Between an Addressable System and a Conventional System?
  • 4 What is the Difference Between Electricity Flow and Signal or Power Flow?
  • 5 NFPA's 7 Classes of Fire Alarm Paths

Supervision & T-Taps on the SLC

  • 6 What Is Addressable Supervision?
  • 7 Is an EOL Resistor Needed for an Addressable System?
  • 8 How many T-Taps are allowed on a Signaling Line Circuit (SLC)?

Programming and Addressing the Devices

  • 9 How do You Use the Switches for Addressing?
  • 10 Can a Control Module & Pull Station Address be Sequential?
  • 11 It's the Volunteer Firefighter that Reads the Panel

Signals and Multiplexing

  • 12 What are the Signals on the SLC?
  • 13 Is the Signaling Line Circuit (SLC) a Data-Power Bus?
  • 14 How Does Multiplexing of the Signaling Line Circuit Work?
  • 15 How does an SLC Carry Both Signals and Power?

Modules and Devices

  • 16 How Does the Panel Know the Address?
  • 17 Why are Modules Needed in a Fire Alarm System?
  • 18 What is Voltage Free Interfacing?
  • 19 Can I use an Addressable Detector on a Conventional Panel?

Connecting Panels and Devices

  • 20 Can an SLC Power a Horn or Strobe?
  • 21 Can the Input and Output Wires on a Speaker be Reversed?

Troubles on the SLC

  • 22 What Happens to the SLC when a Device is Disconnected?
  • 23 Why Can't You Reset a Trouble on a Fire Alarm Panel?
  • 24 Why Can't I Reset the Panel After Disconnecting the SLC?
  • 25 Why Won't the Panel Show the Detectors?
  • 26 How do I Fix a Damaged Loop?

Wire Length and Capacitive Lag

  • 27 How does Capacitance and Shielding Affect Wiring?
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