Which hand signal guidelines must be used to signal cranes according to OSHA?

The correct choice emphasizes the importance of clarity in hand signals for crane operations. OSHA 1926.1400 Appendix A specifically details the standardized hand signals that must be employed for various crane operations. This appendix outlines the visual communication necessary to ensure that crane operators and signal persons can effectively communicate during lifting activities, minimizing the risk of accidents and ensuring safety on site.

These signals are crucial because they provide a common language that can be understood by all personnel involved, regardless of their background or experience level. The uniformity of these hand signals helps reduce confusion and miscommunication, which are often critical factors in workplace safety incidents involving cranes.

While there are other appendices and guidelines under OSHA that address crane operation or specific safety practices, the focus of Appendix A is primarily on the hand signals. This makes it the relevant choice for a question specifically about signaling techniques.