The purged and pressurized protection technique for hazardous locations is permitted for equipment that is what?

The purged and pressurized protection technique is specifically designed to ensure that equipment operating in hazardous locations remains safe by preventing the ingress of flammable gases or dust. For this protection technique to be permitted, the equipment must be "identified," which refers to its classification and how it is specifically designed to be used in hazardous environments.

Equipment that is identified for use in hazardous locations is clearly marked and documented by the manufacturer to ensure that it meets specific safety standards and is built to withstand the conditions present in those environments. This identification typically involves certification by recognized testing laboratories that confirm the equipment complies with the necessary codes and standards for safety.

While the other options might sound relevant, they do not correctly fit the criteria necessary for purged and pressurized equipment. For example, equipment being standardized may suggest that it follows certain common practices, but that does not guarantee its suitability for hazardous locations. Similarly, testing refers to the evaluation of performance but does not inherently address the classification required for handling hazardous materials. Monitoring involves overseeing the ongoing operation of the equipment rather than its initial suitability for the hazardous environment. Thus, the correct answer focuses on the foundational requirement that the equipment must be specifically identified for safe use in those conditions.