Which action is NOT acceptable before entering a confined space?

Entering a confined space without any supervision is not acceptable because it poses significant safety hazards. Confined spaces often present dangerous conditions, including toxic atmospheres, low oxygen levels, or the potential for engulfment. Supervision is critical to ensure safety protocols are followed, response measures are in place, and to monitor the well-being of individuals within the space. Proper oversight helps prevent accidents and ensures immediate assistance can be provided if an emergency arises.

In contrast, being properly trained and instructed, utilizing a buddy system, and conducting atmospheric testing are all vital safety practices. Training ensures that individuals understand the risks and necessary precautions. The buddy system promotes safety through mutual support, allowing individuals to assist each other in emergencies or complications. Atmospheric testing is essential for identifying hazards in the air before entry, ensuring the environment is safe for personnel. These practices establish a comprehensive safety framework that minimizes risk in confined spaces.