An auxiliary relay to shut down the HVAC system from the fire alarm control panel must be located within how many feet of the HVAC system?

• A. 3 ft.
• B. 10 ft.
• C. 1 ft.
• D. 5 ft.

Answer: (A)

The important idea is that the relay used to shut down the HVAC from the fire alarm needs to be physically near the equipment it controls. Placing the auxiliary relay within a short distance (three feet) ensures a direct, quick, and reliable shutdown signal from the fire alarm panel to the HVAC gear. Shorter wiring paths reduce the chance of wiring faults or delays and make testing and maintenance easier, which is crucial in an emergency where every second counts for smoke control and safe egress. Distances like one foot or five or ten feet don’t meet this proximity requirement, so they could introduce delays or reliability issues.