Which evidence best demonstrates that emergency lighting is reliable during power loss?

• A. A floor plan showing exits.
• B. A maintenance log showing regular tests and battery status.
• C. A vendor invoice for lighting fixtures.
• D. A copy of the building lease.

Answer: (B)

Emergency lighting reliability during power loss is demonstrated by documented, ongoing functional testing and battery status. A maintenance log that records test dates, outcomes, and the current condition of the batteries shows the system is regularly checked, batteries are kept in good condition, and any issues are addressed promptly. This directly proves the lights will function when the main power fails, which is exactly what inspectors need to verify. Other items don’t show how the system performs under loss of power: a floor plan indicates exits, not lighting performance; a vendor invoice covers purchases rather than operation; a building lease is unrelated to lighting reliability.