Which of the following actions is NOT typically taken for initial actions on a class bravo fire?

In the context of firefighting, particularly with Class Bravo fires, the correct answer highlights that using a water hose is typically not an appropriate initial action for managing this type of fire. Class Bravo fires involve flammable liquids, and applying water can actually spread the fire due to the lighter-than-water nature of these fuels.

Instead, the effective strategies for combating Class Bravo fires focus on suppressants that are specifically designed to smother the flames and prevent re-ignition. For this reason, activating AFFF (Aqueous Film-Forming Foam) systems, deploying portable AFFF, and utilizing portable PKP (Potassium Bicarbonate Powder) are appropriate actions. These agents are effective in extinguishing liquid-fueled fires by creating a barrier between the fuel and the oxygen, thus effectively suppressing the flames without risking the spread of the fire, as water would.

In summary, the action that is not typically taken for initial responses to a Class Bravo fire is the use of a water hose, due to the specific and hazardous nature of how these fires behave with water involvement.