Which of the following is a requirement for hose valves?

The requirement pertaining to hose valves, as outlined in NFPA standards, emphasizes that they should have appropriate supervision to ensure reliability and readiness for use in case of fire emergencies. The correct response highlights the need for either sealing, electrical supervision, or power supervision.

Sealing is important as it prevents unauthorized access and tampering, ensuring that the hose valves remain in good working condition and function as intended during emergencies. Electrical supervision is crucial in scenarios where systems may rely on electrical signals to indicate the operational status of the valve. Power supervision is applicable in systems that may require electrical activation or signaling to function properly.

By encapsulating both sealing and supervision methods, this requirement ensures comprehensive oversight of hose valves. It helps to verify that hose valves are not only accessible but also functional and reliable when needed, thereby maintaining the integrity of fire protection systems. This multi-faceted approach to supervision and sealing is integral in upholding the performance and safety standards of water-based fire protection systems.