(41)"Occupancy or Use Croup" means the principal occupancy for which a building or a part of a building is used or intended to be used, for the purposes of classification of a building according to occupancy, an occupancy shall be deemed to include subsidiary occupancies which are contingent upon it.Explanation. - The occupancy classification shall have the meaning given as under:-(i)"Residential Buildings" include any building in which sleeping accommodation is provided for normal residential purposes with or without cooking or dining or both facilities. It includes one or two or multi-family dwellings, lodging or rooming houses, dormitories, apartment houses and flats and residential hotels;(ii)"Educational Buildings" include any building used for school, college or day-care purposes for more than eight hours per week involving assembly for instruction, education or recreation incidental to educational buildings;(iii)"Institutional Building" include any building or part thereof which is used for purposes such as medical or other treatment or care of persons suffering from physical or mental illness, disease or infirmity, care of infants, convalescents or aged persons and for penal or correctional detention in which the liberty of the inmates is restricted. Institutional buildings ordinarily provide sleeping accommodation for the occupants. It includes hospitals, sanitoria, custodial institutions and penal institutions like jails, prisons, mental hospitals and reformatories;(iv)"Assembly Building" include any building or part of a building where groups of people congregate or gather for amusement recreation, social, religious, patriotic, civil, travel and similar purposes; for example theatres, motion picture houses, assembly halls, auditoria, exhibition halls, museums, skating rinks, gymnasium, restaurants, place of worship, dance halls, club rooms, passenger stations, and terminals of air, surface and other public transportation services, recreation piers and stadia;(v)"Business building" means any building or part of a building which is used for transaction of business for the keeping of accounts and records for similar purposes and include doctor's service facilities, city halls, town halls, Court houses, record and references libraries, where principal function of these is transaction of public business and the keeping of books and records;(vi)"Mercantile building" means any building or part of a building which is used as shops, stores, markets, for display and sale of merchandise either wholesale or retail Office storage and service facilities incidental to the sale of merchandise and located in the same building shall be included under this group; .(vii)"Industrial Building"means any building or part of a building or structure, in which products or materials of all kinds and properties are fabricated, assembled or processed and include assembly plants, laboratories, power plants, smoke houses, refineries, gas plants, mills, dairies, factories;(viii)"Storage Building"means any building or part of a building used primarily for the storage or sheltering of goods, wares or merchandise and include ware houses, cold storage,, freight depots, transit sheds, store houses, public garages hangers, truck terminals, grain elevators, barns and stables;(ix)"Hazardous building"means any building or part of a building which is used for the storage, handling, manufacture or processing of highly combustible or explosive materials or products which are liable to burn with extreme rapidity and/or which may produce poisonous fumes or explosions, for the storage, handling, manufacturing or processing whereof involve highly corrosive, toxic or noxious alkalies acids or other liquids or chemicals producing flame, fumes and explosive, poisonous, irritant or corrosive gases; and tor the storage, handling or processing of any material producing explosive mixtures of dust or which result in the division of matter into fine particles subject to spontaneous ignition;
