What are the primary hazards of Class I, Zone 0, 1, and 2 locations?

In Class I locations, particularly Zones 0, 1, and 2, the primary hazards stem from the presence of flammable gases and vapors in the atmosphere. Zone 0 refers to an area where an explosive gas-air mixture is continuously present, whereas Zone 1 indicates where such a mixture is likely to occur under normal operating conditions. Zone 2 is where the gas-air mixture is not likely to occur in normal operation but can do so in abnormal situations.

Because these zones are associated with the potential for the ignition of gases and vapors, the focus is on controlling the environment and the equipment used in these areas to prevent any ignition sources. Flammable gases can create explosive mixtures with air, which means that any electrical equipment operating in such environments must comply with strict standards to ensure it does not become a source of ignition. Thus, the hazards primarily associated with Class I locations are the ignition of these gases and vapors, leading to the choice being the most appropriate answer.

While combustion of liquids, storage of solid combustibles, and electrical hazards are significant concerns in electrical safety, they do not directly relate to the specific definitions and risks associated with the designated Class I zones.