What is the maximum sliding section allowed when using an extension ladder?

The correct answer, which indicates that a maximum of two sliding sections is allowed when using an extension ladder, aligns with safety standards and best practices for ladder use. Extension ladders are designed to provide stability and support at certain heights, and the sliding sections help achieve a greater extension while maintaining an overall manageable weight and balance.

Having two sliding sections allows for adequate height adjustment while keeping the integrity of the ladder structurally sound. This limitation helps prevent excessive flexing or instability that could arise from having a longer and more unwieldy ladder, which increases the risk of accidents or falls.

When employing extension ladders, adhering to this guideline ensures not only the user's safety but also contributes to more effective and reliable performance when the ladder is in use.