Frequently Asked Questions
Supervision and the EOL Resistor
- 1 - Why Does the Fire Alarm Panel Supervise the Wires?
Signal and Power Flow
- 2 - What is a Fire Alarm Signal?
- 3 - What is the Difference Between Electricity Flow and Signal or Power Flow?
- 4 - How Are Fire Alarm Loops Supervised?
- 5 - Why is Supervised Wiring So Important?
- 6 - What is the End of Line Resistor For?
- 7 - What Makes the EOL Resistor so Important?
- 8 - The End of Line Resistor Pulls the Voltage Down?
- 9 - Why Use Pigtails or a UL Listed End-of-Line Resistor?
- 10 - Why Isn't an End of Line Resistor Used the Same Way as a Terminating Resistor?
- 11 - NFPA's Classes of Fire Alarm Paths
- 12 - How to Classify a Signal Pathway
- 13 - What is Conventional Class B Wiring?
- 14 - How Does Conventional Class A Fire Alarm Wiring Work?
- 15 - Can More Than One Class A Circuit be in a Conduit?
- 16 - What is the Quadruple Use of the Initiating Device Circuit (IDC)?
- 17 - How Does Resistance Affect the Initiating Device Circuit (IDC)?
- 18 - Why Install Service Loops on Ceiling Smoke Detectors?
- 19 - Why is There an EOL Resistor on a Pressure Switch?
- 20 - How Do You Troubleshoot Using Supervision Voltage?
- 21 - Why Would a Smoke Detector be Wired Incorrectly?
- 22 - Is the Sense of Time Important in Troubleshooting?
- 23 - What is a Four-Wire Smoke Detector?
- 24 - What is Smoke Power on a Fire Alarm Panel?
- 25 - How do I Connect a Tamper Switch?
- 26 - How do I Wire a 10-Wire Tamper Switch?
- 27 - Why Does Closing Some Sprinkler Valves Show Trouble?
- 28 - What Does Listed Mean?
- 29 - Is Compatibility an Issue with Smoke Detectors?
- 30 - Can I Use a New Panel with Old Detectors?
- 31 - Is this New Control Panel Compatible with the Old System?
- 32 - Can I use Conventional Detectors on Addressable Systems?