What fire protection is required at wooden doors through which power lines pass?

The requirement for fire protection at wooden doors through which power lines pass aims to minimize the risk of fire that could arise from electrical faults or accidents involving the power lines. The correct choice, which involves having either one portable fire extinguisher or a significant quantity of rock dust, is particularly important for a couple of reasons.

Having a portable fire extinguisher ensures that there is immediate access to fire suppression equipment in case of an emergency. This is crucial in preventing small fires from escalating into larger ones. The option of using 240 lb of rock dust serves as an effective method for fire suppression. Rock dust can be used to smother flames and is particularly useful for preventing the spread of fire, especially in situations where flammable materials might be present.

This dual approach of allowing either a portable extinguisher or rock dust underlines the need for preparedness. The presence of barricaded pathways, like wooden doors, can potentially store heat and allow for the buildup of dangerous conditions. Therefore, having ready means to combat any resulting fire is essential in maintaining safety standards and preventing serious incidents.