What thickness of concrete is required for ENT to be permitted in assembly occupancies?

The requirement for a thickness of 2 inches of concrete for ENT (Electrical Nonmetallic Tubing) in assembly occupancies is rooted in safety regulations intended to protect electrical systems and ensure compliance with fire safety standards. The specific thickness is established to prevent issues related to fire spread and structural integrity during a fire. Concrete of this thickness aids in providing adequate thermal protection to the electrical wiring contained within the nonmetallic conduit, reducing the chance of ignition and ensuring the safety of the occupants in assembly occupancies, where large groups of individuals may gather.

Choosing a thickness of 2 inches aligns with industry standards designed to enhance fire resistance, and this measure ensures that the conduit is effectively shielded from external heat and flames. Lesser thicknesses would not offer the same level of protection, potentially jeopardizing the safety of electrical systems and the safety of people in these environments.