When entering a permit-required confined space, what should be assumed about hazardous gases?

When entering a permit-required confined space, it is essential to recognize that hazardous gases may be present and could pose significant risks. The correct assumption is that these gases require test equipment to identify. This is vital because many hazardous gases are colorless, odorless, and could potentially be lethal. Relying on personal senses alone (like sight or smell) may not provide accurate or safe information about the environment.

Testing for hazardous gases using appropriate monitoring equipment ensures that workers can safely assess the conditions before entry. These readings can alert personnel to the presence and levels of toxic or explosive gases, allowing for proper safety measures to be implemented, such as ventilation or personal protective equipment.

Understanding this aspect of confined space safety helps reinforce the broader principle that never assume the safety of a space without proper testing and equipment, given the potential for hidden dangers that may not be immediately evident.