What is required for ENT and fitting encased in poured concrete?

For Electrical Nonmetallic Tubing (ENT) and fittings that are encased in poured concrete, it is essential to use fittings specifically identified for this purpose. These fittings are designed to ensure that they can withstand the potential stresses and environmental conditions posed by being embedded in concrete, which may include moisture, pressure, and thermal expansion.

Using properly identified fittings helps maintain the integrity and safety of the electrical installation, as they are tested and rated for such applications. This ensures compliance with the National Electrical Code (NEC) and local regulations, providing both safety and reliability for electrical systems installed in these environments.

The other options do not meet the critical safety and compliance standards needed for installations encased in concrete, which is why they are not appropriate choices for this particular situation.