National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

According to OSHA, which accessible area of an operating crane must always be barricaded?

1. The swing radius of the crane

2. The carbody or chassis

3. The swing radius of the rear of the rotating superstructure

4. The distance between the car body or chassis and the boom tip

The correct answer is: The swing radius of the rear of the rotating superstructure

The correct choice pertains to the swing radius of the rear of the rotating superstructure, which must always be barricaded according to OSHA regulations. This area is critically important because it represents a significant hazard for personnel working near the crane. When the crane is in operation, the rear of the superstructure can swing and potentially strike individuals or objects in its path. To mitigate these risks, OSHA mandates that this area be clearly marked and barricaded, ensuring that workers understand the danger and stay clear from that zone during crane operation. In contrast, the other areas mentioned do not have the same level of risk associated with them or may not be as critical in terms of preventing hazards. For instance, while the swing radius of the crane itself involves risks, the emphasis on barricading is more specifically focused on the rear swing radius where the potential for impact may be heightened due to the direction of normal crane operations. Thus, understanding the specific areas that require barricading helps enhance safety protocols on construction sites.