Class 1 Division 1 locations are characterized by the existence of flammable gases or vapors during which conditions?

Class 1 Division 1 locations are defined by the presence of flammable gases or vapors that can be present under normal operating conditions. This classification indicates that the environment is hazardous continuously or frequently enough that an explosive mixture is likely to exist. Therefore, the risk of ignition is significant at all times, not just during specific operations like repair or installation.

Normal conditions refer to the usual operational environment where the equipment is running as intended, and in these situations, the materials present can easily ignite due to sparks or heat produced by equipment operation. Understanding this classification is crucial for designing safety measures and choosing appropriate equipment for hazardous locations.

The other options imply specific operational scenarios that do not represent the ongoing risk inherent in a Division 1 classification, underscoring the importance of recognizing the continuous presence of hazards in determining proper safety protocols.