Which characteristic is NOT part of a permit-required confined space?

A permit-required confined space is defined by specific characteristics that indicate potential hazards for individuals entering that space. The presence of a possibly hazardous atmosphere is a key feature, as these spaces often have conditions that could pose significant health risks, such as toxic gases or lack of oxygen.

The possibility of engulfment is another defining characteristic. This occurs when a person could be surrounded by materials that could immobilize or suffocate them, such as liquids, grain, or other materials that can fill the space.

The risk associated with internal configuration is also crucial, as certain shapes or structures within the confined space can lead to trapping or asphyxiation. This includes features like inwardly sloping walls or ledges that can prevent a safe exit.

High temperature, while it can be a concern in many environments, is not a defining characteristic of a permit-required confined space. It can pose physical stress or health hazards to workers, but it does not inherently classify a space as permit-required. Hence, high temperature is not included in the essential characteristics that classify a confined space requiring a permit.