What is the maximum interval for testing a device that is inaccessible due to excessive height?

The maximum interval for testing a device that is inaccessible due to excessive height is set at 18 months. This guideline is primarily established to ensure that all fire alarm systems, including those mounted in hard-to-reach areas, are maintained effectively. Fire alarm devices are critical for the safety of a building's occupants, and regular testing ensures they will function correctly during an emergency.

The 18-month interval balances the need for reliability with the practical challenges posed by difficult access, allowing for a reasonable timeframe before the next testing cycle is due. This guideline is often stipulated in the applicable codes and standards related to fire safety and alarm systems, aiming to minimize risks and ensure that all devices are adequately monitored.

Although several options exist for testing intervals, the 18-month mark represents an industry-standard understanding of maintaining safety without overly straining personnel resources or causing disruptions due to accessibility issues.