What is a NAC trouble?
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 does NAC mean on a fire panel?
Notification Appliance Circuit
A: Each NAC (Notification Appliance Circuit) in a fire alarm panel or booster power supply has a maximum current rating. This information can be found in the manuals provided with the panels. The total current draw for all the devices connected to the circuit cannot exceed the NAC rating.
What does NAC mean in electrical?
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 causes Udact trouble?
Annunciation of UDACT Troubles including: loss of phone lines, communication failure with either Central Station, total communications failure. Individual LEDs for: Power, EIA-485 Loss, Manual Test, Kissoff, Comm Fail, Primary Line Seize, Secondary Line Seize and Modem Communications.
What happens when there are trouble signals on the fire alarm system?
With Trouble signals, you will want to call your service provider, but it can wait until normal business hours. There is no need to spend extra money for an emergency after hours service call.
What is SLC and NAC?
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.
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.
What do NAC panels do?
NAC Power Supply systems provide a sure-fire way to provide emergency notifications to the occupants of a particular building or residence. The NAC circuit is designed to start at the main fire alarm panel and connects to the notification devices in the building or residence, thereby completing the circuit.
What is a system peripheral trouble?
If a peripheral sensor is ever activated, then that means there is a potential security risk, and the system will alert the user to the trouble. For example, if an intruder is able to enter your front door, the will most certainly cause its door contact to activate and trigger the programmed zone on the security panel.
What does Udact trouble mean?
The UDACT transmits system status to UL listed Central Station Receivers via the public switched telephone net- work. The UDACT is capable of transmitting the status of soft- ware zones (Alarm and Trouble), System Trouble, Panel Off-Normal, Supervisory, Bell Trouble, Low Battery, and AC Fail.
What is a fire loop trouble?
A Fire Loop Trouble is a fault condition. Although this fault may indicate that you have an electrical problem with the security system’s fire circuit, it is often found that a contaminated smoke sensor may be responsible for this condition.
What does an open trouble on the NAC mean?
The panel is checking the continuity of the wire in the loop. An open trouble on the NAC says that the supervision current has stopped flowing and the panel is not seeing a continuous wire path (broken continuity). If the current stops flowing through the circuit, it’s because of a loose connection or a broken wire.
What does NAC mean on a fire alarm panel?
What does NAC panel stand for? A special module is installed into a fire alarm panel that is supervised by the receiving equipment for “line fault”, “common trouble”, “supervisory” and “alarm”. NAC: Short for “Notification Appliance Circuit”. Also called the Bell Circuit, Signal Circuit, or Output Circuit.
How do I know which NAC circuit is having a problem?
Usually there more than one NAC circuit out of the fire alarm panel, and if the panel is showing that there is an open circuit, it shows which circuit is having the problem. Once you’ve figured out which circuit and where the circuit runs in the building, you’ve narrowed down where to look for the problem.
What does NAC mean in electrical terms?
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 does NAC panel stand for?