Modern day boiler automation allows bypassing the "flame safeguard" system to permit a burner to have a "trial for ignition" period during burner light-off. This period may not exceed ______.

Correct Answer: Option A — 15 seconds

NFPA and marine safety standards limit the burner ignition trial period on automated boilers to a maximum of 15 seconds. This restricted timeframe prevents unburned fuel accumulation in the furnace, mitigating catastrophic explosion risks during automated or manual burner light-off sequences.