What is a NAC on a fire alarm system?

NAC is the acronym for Notification Appliance Circuit. Notification: Tells people of a Fire or other Life Threatening Emergency. Appliance: Horns, Strobes, Chimes, Bells, Klaxons, Speakers. Circuit: Physical wire loop carrying power to the Notification Appliances.

What is NAC fault in fire alarm system?

An Open NAC is a trouble on a fire alarm panel that shows that a wire in the building, somewhere along the Notification Appliance Circuit, or horn / strobe circuit, has has broken wire or it has come loose from a screw terminal or splice.

What devices are on a NAC circuit?

In the Notification Appliance Circuit (NAC), conventional fire horns, bells, strobes, chimes, and speakers, all have the Notification Appliance Riser Circuit Wiring in common. This circuit, under normal circumstances, is in either one of two different conditions: Supervision or Alarm.

What is a NAC line?

NAC is an acronym which stands for “Notification Appliance Circuit”. … The circuit connects the power source of the building or residence to the notification appliances such as horns and strobes.

What is a NAC expander?

LifeSafety Power’s four-zone Notification Appliance Circuit (NAC) Expander Power Supplies are designed to extend the power capabilities of existing NACs and provide power for auxiliary devices. The units can connect to any 12 or 24V Fire Alarm Control Panel (FACP) or operate as a standalone system.

IMPORTANT:  Quick Answer: Can you have a fire pit in Scottsdale?

Where is the open circuit on a fire alarm?

The only way to locate an open circuit on the detection loop is to remove one end of the circuit from the loop terminals. The control panel will now list all the devices it can’t communicate with as a fault, and the list should go up to the break within the detection loop.

What is an IDC circuit?

In a fire alarm system, the Initiating Device Circuit (IDC) is an input circuit or detection circuit: it carries the alarms detected by devices like flow switches, pull stations, heat detectors, tamper switches, etc. … If the wire loses continuity, the panel will show that there’s trouble on the circuit.

What is the purpose of a NAC panel?

The Notification Appliance Circuit is a pair of wires that carry power from the control panel to the devcies that warn people of danger: the horns, strobes, bells, speakers, chimes, etc.

What is NAC and SLC?

SLCs are essentially data circuits, supporting addressable devices. NACs use an end-of-line resistor to monitor polarity and are made up of audible and visible notification devices. … In it, an SLC is defined first by stating that it is a circuit capable of supporting any mixture of addressable devices.

What is a fire alarm annunciator?

A fire alarm annunciator is the component of the fire alarm system that displays the status of the fire alarm system using visible and audible indicators. … The remote annunciator might also include controls that allow facility staff to reset the fire alarm system and control other functions manually as needed.

IMPORTANT:  Best answer: Can Firefighting be a part time job?

What are the types of detectors?

There are two main types of detectors: photon detectors and thermal detectors. All detectors have similar characteristics: The output of a detector must respond to changes in the incident light intensity. The ability to respond is expressed by quantities such as responsivity, sensitivity, and dynamic range.

What is an end of line resistor?

End-of-Line Resistor (or EOL) is a resistor that completes the zone circuit in a fire alarm system. Common resistances include 1KΩ、2.2KΩ、4.7KΩ、5.6KΩ、6.8KΩ, which can vary depending on the brand. For a typical alarm system, the notification device signals can be either normally open (NO) or normally close (NC).