Podcast
Questions and Answers
What are alarm sirens rated in?
What are alarm sirens rated in?
Wattage and decibel output
What is the range of the supervising current in a Class B fire alarm circuit?
What is the range of the supervising current in a Class B fire alarm circuit?
Milliampere
Modern alarm systems may utilize window screens which will provide alarm protection with the window open. This method utilizes a screen that has fine insulated wires running through it in parallel paths about __________ to __________ cm apart.
Modern alarm systems may utilize window screens which will provide alarm protection with the window open. This method utilizes a screen that has fine insulated wires running through it in parallel paths about __________ to __________ cm apart.
5 to 7
What does a Class B detection circuit in a fire alarm system contain?
What does a Class B detection circuit in a fire alarm system contain?
Signup and view all the answers
There are normally four conditions to be considered in a fire alarm system. They are a normal condition, a manual pullstation condition, a trouble condition, and a supervisory condition.
There are normally four conditions to be considered in a fire alarm system. They are a normal condition, a manual pullstation condition, a trouble condition, and a supervisory condition.
Signup and view all the answers
What condition is created when a short circuit occurs across the conductors in a Class B signal circuit?
What condition is created when a short circuit occurs across the conductors in a Class B signal circuit?
Signup and view all the answers
Which type of smoke alarm is the best type to install in a residence?
Which type of smoke alarm is the best type to install in a residence?
Signup and view all the answers
What is the voltage of the signal through the traveller conductor putting other smoke alarms into the alarm status?
What is the voltage of the signal through the traveller conductor putting other smoke alarms into the alarm status?
Signup and view all the answers
What does a microwave motion detector measure?
What does a microwave motion detector measure?
Signup and view all the answers
What condition is created when a short circuit occurs across the conductors in a Class B detection circuit?
What condition is created when a short circuit occurs across the conductors in a Class B detection circuit?
Signup and view all the answers
What does a Class B signal circuit in a fire alarm system contain?
What does a Class B signal circuit in a fire alarm system contain?
Signup and view all the answers
Any time that a terminal or splice is opened and the supervisory current of an alarm system is interrupted, the alarm will be activated and an alarm condition will be indicated at the control panel.
Any time that a terminal or splice is opened and the supervisory current of an alarm system is interrupted, the alarm will be activated and an alarm condition will be indicated at the control panel.
Signup and view all the answers
Output devices for a basic residential alarm system include?
Output devices for a basic residential alarm system include?
Signup and view all the answers
What is one of the major causes of false alarms in regards to motion detectors?
What is one of the major causes of false alarms in regards to motion detectors?
Signup and view all the answers
Earlier models of motion detectors were developed with principles similar to?
Earlier models of motion detectors were developed with principles similar to?
Signup and view all the answers
Passive Infrared Detectors sense changes in?
Passive Infrared Detectors sense changes in?
Signup and view all the answers
A basic fire alarm system must contain at least _______ components.
A basic fire alarm system must contain at least _______ components.
Signup and view all the answers
Rollerball contacts are more or less expensive to produce over magnetic reed switches?
Rollerball contacts are more or less expensive to produce over magnetic reed switches?
Signup and view all the answers
Which Code states that smoke alarms must be installed in residential units?
Which Code states that smoke alarms must be installed in residential units?
Signup and view all the answers
How can each area of protection (zone) of an alarm system be programmed?
How can each area of protection (zone) of an alarm system be programmed?
Signup and view all the answers
Which of the following is an advantage of a photoelectric smoke alarm?
Which of the following is an advantage of a photoelectric smoke alarm?
Signup and view all the answers
If there is an open in the conductors of a Class B signal circuit, what condition will the fire alarm system be in?
If there is an open in the conductors of a Class B signal circuit, what condition will the fire alarm system be in?
Signup and view all the answers
A residential security alarm system is normally a __________ circuit.
A residential security alarm system is normally a __________ circuit.
Signup and view all the answers
The Class B circuit is one continuous path connecting all field devices together and terminating with what type of device?
The Class B circuit is one continuous path connecting all field devices together and terminating with what type of device?
Signup and view all the answers
Which of the following devices would be considered an internal intrusion sensing device?
Which of the following devices would be considered an internal intrusion sensing device?
Signup and view all the answers
Generally, what is the purpose of strobe lights when utilized as part of a security system?
Generally, what is the purpose of strobe lights when utilized as part of a security system?
Signup and view all the answers
Where does a Security System Central Processing Unit, under normal conditions, receive its electrical power?
Where does a Security System Central Processing Unit, under normal conditions, receive its electrical power?
Signup and view all the answers
Match the 4 conditions of a fire alarm system:
Match the 4 conditions of a fire alarm system:
Signup and view all the answers
Intrusion sensing devices are divided into what two categories?
Intrusion sensing devices are divided into what two categories?
Signup and view all the answers
What is a magnetic reed switch?
What is a magnetic reed switch?
Signup and view all the answers
Magnetic reed switches have a life cycle of up to __________ operations.
Magnetic reed switches have a life cycle of up to __________ operations.
Signup and view all the answers
What is generally used for sealed windows where entry to the frame is restricted?
What is generally used for sealed windows where entry to the frame is restricted?
Signup and view all the answers
What are used for doors and higher security areas to make contact tampering less likely?
What are used for doors and higher security areas to make contact tampering less likely?
Signup and view all the answers
Glass break detectors work off the principles of?
Glass break detectors work off the principles of?
Signup and view all the answers
An acoustic sound pattern detector or shatter switch should be mounted?
An acoustic sound pattern detector or shatter switch should be mounted?
Signup and view all the answers
Dual technology and shock wave detectors combine what two methods?
Dual technology and shock wave detectors combine what two methods?
Signup and view all the answers
PIRs are also known as?
PIRs are also known as?
Signup and view all the answers
How is the CPU of a residential alarm programmed?
How is the CPU of a residential alarm programmed?
Signup and view all the answers
A normally open loop goes into an alarm when a contact?
A normally open loop goes into an alarm when a contact?
Signup and view all the answers
A CPU requires a ____v battery to maintain power during an outage.
A CPU requires a ____v battery to maintain power during an outage.
Signup and view all the answers
Sirens are often installed in?
Sirens are often installed in?
Signup and view all the answers
Residential alarms typically operate at a nominal voltage from __________ to __________.
Residential alarms typically operate at a nominal voltage from __________ to __________.
Signup and view all the answers
What is a stand alone, battery operated, and electrically connected device?
What is a stand alone, battery operated, and electrically connected device?
Signup and view all the answers
The most common type of smoke alarm is an?
The most common type of smoke alarm is an?
Signup and view all the answers
A basic fire alarm system must contain what components?
A basic fire alarm system must contain what components?
Signup and view all the answers
Field devices can be separated into what two categories?
Field devices can be separated into what two categories?
Signup and view all the answers
Study Notes
Alarm Systems Overview
- Alarm sirens are rated in wattage and decibel output.
- Class B fire alarm circuits provide electrical supervision with a continuous supervisory current, typically ranging from 20 to 60 milliamperes.
- Modern alarm systems may utilize window screens with insulated wires running in parallel paths approximately 5 to 7 cm apart.
Fire Alarm System Components
- A Class B detection circuit in a fire alarm system contains smoke detectors and alarms.
- A basic fire alarm system must consist of at least three components: the fire alarm control panel, a manual pull station, and an audible signal device.
- Output devices in a basic residential alarm system include strobe lights and sirens.
Alarm System Conditions
- Fire alarm systems consider four primary conditions: Normal, Trouble, Alarm, and Supervisory.
- A short circuit in a Class B signal circuit leads to a Trouble condition, while a short circuit in a Class B detection circuit results in an Alarm condition.
Motion and Smoke Detectors
- Microwave motion detectors measure movement utilizing radar technology.
- Passive Infrared Detectors (PIRs) sense changes in heat emitted by objects.
- Different types of smoke alarms include photoelectric smoke alarms, which respond faster to smoldering fires and are recommended for residential use.
Circuit Types and Specifications
- Residential security alarm systems typically operate on Class 2 circuits.
- Supervision current interruptions in circuits can trigger alarm conditions at control panels.
- Class B circuits connect all field devices in a continuous path ending with an end-of-line device.
Device Functions and Performance
- Magnetic reed switches operate with a lifecycle of up to ten million operations and consist of a long metal reed pulled by magnetic force.
- Surface mount contacts are used for sealed windows, while recessed contacts are preferred for doors to reduce tampering risk.
- Glass break detectors operate based on acoustic shock waves and sound patterns.
Power and Programming
- A Security System Central Processing Unit (CPU) normally draws power from an AC supply.
- During power outages, a CPU requires a 12v battery to maintain operation.
- The alarm CPU can be programmed via a keypad.
Operational Considerations
- Improper installation is a significant cause of false alarms in motion detectors.
- Strobe lights are used to call attention to activated alarms, enhancing visibility during security events.
- Residential alarms typically operate at a nominal voltage ranging from 6 volts to 12 volts.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on alarm systems and their critical components. This quiz covers essential concepts like Class B fire alarm circuits, system conditions, and the vital elements of a basic fire alarm setup. Perfect for those studying fire safety and alarm technology.
