Which statement best describes zone isolation in a conventional fire alarm system?

• A. It allows a faulty zone to be isolated so other zones can continue operating or be tested independently.
• B. It disables all alarms system-wide.
• C. It re-routes alarms to a central security office.
• D. It increases NAC power capacity.

Answer: (A)

Zone isolation focuses on containing a fault so the rest of the system keeps working. In a conventional fire alarm, zones are separate loops of devices. If one zone develops a fault, isolating that zone prevents that problem from affecting other zones, allowing the remaining zones to continue operating and to be tested independently. The other options describe actions that aren’t what zone isolation does: disabling the entire system, rerouting alarms to a central office, or increasing the power capacity of the notification circuits.