Under what condition can Group D buildings contain another major occupancy?

Group D buildings, which are primarily used for business and personal services, are subject to specific regulations regarding the integration of other major occupancies. The restriction on combining these buildings with A1 (Assembly Occupancies), A3 (Assembly Occupancies), and B1-3 (Residential Occupancies associated with care, education, or detention facilities) reflects safety considerations inherent to fire protection, egress, and occupancy load.

A. Always allowed regardless of height is not correct because there are defined limits on how and where different major occupancies can coexist, especially as building height increases, which could pose additional risks.

B. Without restrictions cannot apply, as safety codes outline specific circumstances under which additional major occupancies can be situated within a Group D building, particularly to ensure clear egress paths and fire safety measures.

C. As long as they are below the second storey misrepresents the restrictions, as occupancy regulations do not simplify restrictions solely based on height without considering the nature of other major occupancies present.

Understanding these limitations is essential for ensuring that designs meet fire safety standards and provide adequate safety for all occupants. Thus, the correct response reflects the need to restrict particular major occupancies to prevent potential hazards in Group D buildings.