What warning language is recommended for a Class K placard?

The recommended warning language for a Class K placard emphasizes the importance of using the extinguisher in conjunction with a fixed suppression system, specifically after it has been actuated. Class K extinguishers are designed for fires involving cooking oils and fats, common in commercial kitchens. The warning highlights that the use of the extinguisher should only occur once a dedicated fire suppression system has been activated, ensuring that the fire hazard is addressed safely and effectively. This precaution is vital because Class K fires can be intense and dangerous, and the fixed suppression system is intended to help control the fire before further intervention with a portable extinguisher is necessary.

In contrast, the other options do not align with the specific safety protocols associated with Class K extinguishers. The phrase regarding safe usage can be ambiguous, while the caution against usage on electrical fires may not be relevant here since Class K fires typically involve combustible cooking materials. Checking for leaks before use is good practice for all extinguishers, but it is not specific to the unique risks associated with Class K extinguishers in kitchen environments.