Fire: 

In this context, "fire" refers to an uncontrolled burning of material that can cause damage or harm to people, property, or the environment.

Fault: 

A "fault" typically refers to an abnormal condition or failure in a system. In the context of fire alarm systems, a fault could indicate a malfunction or breakage in the wiring, sensors, or other components, which can affect the system's performance.

Configurable Relay:

A "configurable relay" is an electronic device that can be programmed or set up to perform specific switching functions based on predefined conditions or inputs. In the context of fire alarm systems, a configurable relay might be used to control the activation or deactivation of certain devices or circuits based on the system's requirements.

Staged Delay Configuration for Alarm Verification: 

"Staged delay configuration" refers to a setup where a fire alarm system is designed to introduce delays in the activation of alarms or other response actions. The purpose of these delays is to allow for a verification process before initiating a full alarm. It helps prevent false alarms by providing a short time window to confirm the presence of an actual fire or emergency situation.

Individual Class B: 

"Individual Class B" refers to a specific type of wiring configuration used in fire alarm systems. In a Class B wiring configuration, each device (such as smoke detectors or manual call points) is individually connected to the fire alarm control panel using separate circuit wiring. This wiring arrangement ensures that a fault or breakage in one device's circuit does not disrupt the connectivity or functionality of other devices in the system.

Circuit Isolation:

"Circuit isolation" refers to the practice of separating electrical circuits in a fire alarm system. This separation ensures that a fault or disruption in one circuit does not affect the operation or integrity of other circuits. By isolating circuits, any faults or issues can be contained within a specific circuit, minimizing the impact on the overall system.

NAC Configuration:

NAC stands for "Notification Appliance Circuit." NACs are circuits dedicated to activating and controlling notification devices such as horns, strobes, or speakers in a fire alarm system. "Circuit-wise NAC configuration" implies that the notification appliance circuits are set up or configured individually, allowing for specific control and customization of each circuit's behavior and connected devices.