Which component is NOT part of sprinkler system maintenance according to the NFPA?

In the context of sprinkler system maintenance as outlined by the National Fire Protection Association (NFPA), regular inspections of fire extinguishers do not fall under the maintenance requirements specifically for sprinkler systems. While fire extinguishers are crucial for fire safety, their maintenance is addressed by different standards and guidelines tailored to portable fire-fighting equipment.

On the other hand, checking dry pipe action, verifying hydraulic nameplates, and inspecting supervision alarm devices are all integral components of maintaining a sprinkler system. These tasks ensure the effectiveness and reliability of the sprinkler system in the event of a fire. Checking dry pipe action is vital for systems that rely on dry pipes to ensure that water will flow correctly when needed. Verifying hydraulic nameplates ensures that the system is designed and functioning according to the appropriate specifications for the hazards present. Inspecting supervision alarm devices is essential to confirm that all components in the system are monitored for proper operation and can effectively alert the necessary parties in case of a malfunction or fire event.

Thus, the correct answer reflects an understanding of the distinct responsibilities associated with different types of fire safety equipment.