Which component is specifically used to prevent the pull-out of conduit from an electrical box?

The component that is specifically designed to prevent the pull-out of conduit from an electrical box is the lock nut and bushing. This combination works by providing a secure connection between the conduit and the electrical box. The lock nut tightens against the box, ensuring that the conduit does not loosen or pull away due to tension or movement.

The bushing, on the other hand, protects the edge of the hole in the electrical box, preventing abrasion on the conduit itself and reducing the risk of damage over time. Together, they create a stable and secure condition, essential in maintaining electrical safety and reliability.

Other components listed, such as condulets, conduit straps, and straight connectors, serve different purposes in electrical installations. Condulets are junction boxes for connecting multiple conduit runs, while conduit straps are used to secure conduit to surfaces. Straight connectors connect two lengths of conduit but do not serve the specific function of preventing pull-out from an electrical box like the lock nut and bushing arrangement does.