What is a characteristic of a Class 1 enclosure?

A Class 1 enclosure is designed to contain an explosion within the enclosure itself, thereby preventing the ignition of surroundings or the release of harmful substances into the environment. This is particularly important in environments where flammable gases, vapors, or dust may be present. The requirement ensures safety in hazardous locations by isolating the potential explosion from the exterior environment.

The other characteristics mentioned in the options do not align with the standard definitions and requirements of Class 1 enclosures. For instance, lightweight construction is not a defining factor since the primary focus is on safety and containment rather than weight. Accessibility is also not a defining characteristic; in fact, safety measures may sometimes involve restricting access to these enclosures. Lastly, the statement regarding installation exclusively outdoors is not accurate, as Class 1 enclosures can also be used indoors, provided they are placed in the appropriate hazardous environments.