According to OSHA guidelines, which step is prohibited when using a ladder?

Standing on the top step of a ladder is prohibited according to OSHA guidelines due to safety concerns. The top step is not designed to provide adequate support, and standing on it increases the risk of losing balance and falling. By maintaining a safe working position, typically two steps down from the top, users can ensure better stability and control while accessing elevated areas.

When using ladders, it's critical to follow guidelines to minimize the risk of accidents. For instance, adjusting the ladder while already on it compromises safety, as it could lead to instability. Similarly, while standing on the second step is usually considered safe as long as it doesn't impede balance, the top step lacks the same safety assurance. Climbing without assistance may vary in safety depending on the situation, but it is generally acceptable if the ladder is stable and properly positioned.

Following these guidelines is essential for preventing injuries and promoting a safe working environment.