Podcast
Questions and Answers
What is a smoke alarm?
What is a smoke alarm?
- A device that detects carbon monoxide
- A device that triggers sprinklers for fire suppression
- A heat sensor installed in ceilings
- A standalone device with a built-in audible sounder and control component (correct)
What is fire alarm circuit design dependent on?
What is fire alarm circuit design dependent on?
non addressable (conventional) or addressable, Class A or B, single stage or 2 stage
What is a field device?
What is a field device?
A remote device that is electrically connected to a control unit.
What is an initiating field device?
What is an initiating field device?
What is a signalling field device?
What is a signalling field device?
What is a supervisory field device?
What is a supervisory field device?
What are the two categories field devices can be separated into?
What are the two categories field devices can be separated into?
What is a non-addressable field device?
What is a non-addressable field device?
What is a Class B circuit configuration?
What is a Class B circuit configuration?
How is electrical supervision provided in a Class B circuit?
How is electrical supervision provided in a Class B circuit?
What are the three current conditions that can arise in a Class B circuit?
What are the three current conditions that can arise in a Class B circuit?
What causes a high current flow in a detection circuit in a Class B circuit?
What causes a high current flow in a detection circuit in a Class B circuit?
A short circuit across the circuit conductors in a signal circuit causes a ____ condition for that circuit at the control panel.
A short circuit across the circuit conductors in a signal circuit causes a ____ condition for that circuit at the control panel.
What would cause no current flow in either an initiating or notification circuit conductors? This results in a ___ condition at the control panel.
What would cause no current flow in either an initiating or notification circuit conductors? This results in a ___ condition at the control panel.
When an open circuit occurs in a Class B circuit what happens to the devices beyond the break?
When an open circuit occurs in a Class B circuit what happens to the devices beyond the break?
What does IDC and NAC mean?
What does IDC and NAC mean?
What happens in the IDC or NAC if there are ground faults?
What happens in the IDC or NAC if there are ground faults?
What is a Class A circuit?
What is a Class A circuit?
What is the main advantage to a Class A over a Class B circuit?
What is the main advantage to a Class A over a Class B circuit?
What happens during an alarm condition in a Class A circuit?
What happens during an alarm condition in a Class A circuit?
What is a Tamper device?
What is a Tamper device?
What are supervisory devices in sprinkler systems?
What are supervisory devices in sprinkler systems?
If a tamper switch is opened what happens?
If a tamper switch is opened what happens?
Match the following forms of devices with their descriptions:
Match the following forms of devices with their descriptions:
What are addressable devices?
What are addressable devices?
What happens during a fire condition with addressable devices?
What happens during a fire condition with addressable devices?
What is a distributed type control?
What is a distributed type control?
How does a DCL indicate a trouble condition?
How does a DCL indicate a trouble condition?
What does DCL stand for?
What does DCL stand for?
What are the two types of DCL circuits?
What are the two types of DCL circuits?
What do monitor modules do?
What do monitor modules do?
What are signal modules, and what do they do?
What are signal modules, and what do they do?
What are control modules, and what do they do?
What are control modules, and what do they do?
What is a notification appliance circuit extender panel?
What is a notification appliance circuit extender panel?
How does the NAC communicate with the main fire alarm control panel?
How does the NAC communicate with the main fire alarm control panel?
What are auxiliary systems?
What are auxiliary systems?
What are transponders?
What are transponders?
What is a DCLC circuit?
What is a DCLC circuit?
What are fault isolation modules required for?
What are fault isolation modules required for?
When are single isolation modules required?
When are single isolation modules required?
When are two isolation modules required?
When are two isolation modules required?
What is the recommendation for single-stage Class A?
What is the recommendation for single-stage Class A?
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Study Notes
Smoke Alarms
- Standalone device featuring a built-in audible sounder, control component, and sensor.
Fire Alarm Circuit Design
- Depends on type: non-addressable (conventional) vs. addressable.
- Configurations include Class A or B, and single-stage or two-stage systems.
Field Devices
- Remote devices connected to a control unit, categorized into initiating and signaling devices.
- Initiating devices signal a transition from normal to fire conditions.
- Signaling devices alert occupants of fire conditions.
Circuit Configuration
- Non-addressable devices cannot be individually identified by the control unit; can be connected in Class A or B configurations.
- Class B circuits connect devices in parallel with an end-of-line (EOL) device for current monitoring.
Class B Circuits
- Supervision is provided through a constant current in the milliamp range.
- High current, short circuit, or no current conditions can arise, affecting circuit integrity.
- Short circuits trigger a trouble condition at the control panel.
Class A Circuits
- Devices are connected in parallel without an EOL device, using an alternate loop back to the control panel.
- Provides electrical supervision from both ends of the loop, allowing detection of fire conditions from either direction.
- Advantage: Open circuits still allow devices beyond to operate, resulting in alarm initiation.
Supervisory and Tamper Devices
- Supervisory devices monitor systems like sprinklers to ensure operational status without detecting fire.
- Tamper devices indicate unauthorized removal/opening of protective covers, triggering a trouble signal without interfering with alarm reporting.
Addressable Devices
- Identified individually by the control panel with unique addresses, allowing for precise location identification during fire events.
- Operate via Data Communication Links (DCL) which provide electrical supervision for active addressable devices.
Notification Appliance Circuits
- Extend far from the control panel to avoid voltage drop issues; separated power supplies support device operation and supervision during alarms.
Auxiliary Systems
- Central alarm facilities may include security, communication, heating, and ventilation systems alongside fire detection and alarms.
Isolation Modules
- Required in complex circuit configurations for fault isolation, especially in Distributed Type Control systems to maintain circuit function during faults.
Wiring Installation Standards
- Must comply with CEC section 32 and ULC-S524, ensuring safety and effectiveness in fire alarm systems.
Current Conditions Overview
- Class A and B circuits can experience high current, short circuits, or no current conditions affecting device operation.
- Open circuits in Class B render devices beyond the break inoperable, while Class A devices remain operational.
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