Which of the following is required in assembly occupancies regarding raceways?

In assembly occupancies, the requirement for raceways to be encased in concrete is primarily driven by safety needs and structural considerations. This encasement provides enhanced protection against damage, which is especially crucial in areas with high foot traffic or where equipment may pose a risk of impacting the raceways. The concrete encasement serves both to safeguard the electrical infrastructure and to ensure that any potential failure within the raceway does not pose a hazard to the occupants or the structure itself.

This requirement is aligned with the National Electrical Code (NEC) guidelines, which prioritize safety and reliability in electrical installations within assembly areas. By encasing raceways in concrete, the integrity of the wiring is preserved, significantly reducing the risk of accidental damage and the associated dangers of electrical faults in busy environments where large groups of people gather.