What occupancy classification does not require separation from accessory occupancies in mixed-use buildings?

The classification that does not require separation from accessory occupancies in mixed-use buildings is by defining it according to the context of occupancy classifications outlined in building codes. Classifications A through C primarily encompass Assembly (A), Business (B), and Mercantile (C) occupancies. These occupancies are generally associated with lower risk levels when combined with accessory uses.

In mixed-use buildings, the rationale for allowing these classifications to coexist without the necessity for separation pertains to the nature of the activities and their associated fire risks. Since these are typically lower-risk occupancies, they can share spaces more effectively without significant concerns regarding fire hazards, occupant safety, or other risks that necessitate strict separation protocols.

In contrast, the other classifications mentioned focus more on higher risk scenarios. For instance, H-2 involves hazardous materials, I-1 pertains to institutional occupancy which requires a higher level of safety due to vulnerable populations, and R-3 typically involves residential settings that may have specific requirements for separation to ensure safety and privacy. These distinctions underscore why A through C classifications can cohesively function together in mixed-use structures without mandated separation from accessory uses.