What precaution must be taken when a welder enters a confined space?

When a welder enters a confined space, it is critical to ensure that means are provided for quick removal in case of an emergency. Confined spaces often pose significant hazards, including limited access and potential for toxic atmospheres, which can lead to suffocation or exposure to harmful substances. It is essential to have a plan in place that allows for rapid extraction of the individual should an emergency arise.

Having this means of quick removal — such as a rescue harness, an attentive safety observer posted outside, or appropriate equipment to facilitate an emergency exit — ensures the safety of the welder. This precaution helps to minimize response time in critical situations, which can be the difference between life and death.

In contrast, the other options do not adequately address the inherent risks associated with confined spaces. While providing clear instructions and limiting entry to one person may contribute to safety, they do not specifically account for the urgent needs and potential emergencies that might arise during welding in such hazardous environments. Therefore, the emphasis on providing a reliable means for quick removal is essential for ensuring the safety and health of workers in confined spaces.