What is the minimum water requirement for cooling after using a dry chemical extinguishing system?

The minimum water requirement for cooling after using a dry chemical extinguishing system is a continuous spray to cool the area and prevent re-ignition. This is crucial to ensure that any residual heat is effectively dissipated, as dry chemical extinguishing agents may not completely cool the surface or materials involved in the fire. If these surfaces remain hot, there's a significant risk of the fire reigniting.

Utilizing a continuous spray provides consistent coverage and allows for the thorough cooling of the affected area, which is critical in preventing any flare-ups. A properly cooled environment enhances safety and ensures that the fire is fully extinguished.

Other options do not adequately address the need for cooling. For instance, a bucket of water for immediate application may not provide sufficient coverage or dosage to effectively cool larger areas. Limiting water application to five minutes may not be enough time to ensure thorough cooling, especially in complex situations. Lastly, stating that no water is necessary after discharge neglects the potential risks of hot surfaces and the importance of cooling to prevent re-ignition.