Is the use of a 90° flex connector permitted at the box for a 4 square box flush mounted behind a sheetrock wall?

The use of a 90° flex connector is not permitted at the box for a 4 square box flush mounted behind a sheetrock wall because this type of connector can create issues related to accessibility, strain relief, and potential damage to the conduit. Electrical code standards typically require the use of connector types that ensure proper alignment and secure connections to maintain safety and functionality.

While there might be instances in which local regulations could allow for certain exceptions, generally, the guidelines prioritize maintaining a clear path for wiring and ensuring that connections remain secure without risk of disconnection or damage. Using a flexible connector in a rigid application, such as a flush-mounted box, would not provide the level of durability and reliability required for electrical installations. Thus, the correct approach is to avoid the use of a 90° flex connector in this specific installation scenario.