Which type of fitting is commonly used to secure conduit to an electrical box?

The correct choice for securing conduit to an electrical box is the lock nut and bushing. This fitting is designed to create a secure connection between the conduit and the electrical box, ensuring that the conduit does not disconnect or become loose over time. The lock nut tightens against the box, while the bushing protects the conduit from sharp edges, preventing damage to the conduit and ensuring a safe installation.

The lock nut's ability to provide a strong mechanical connection makes it especially valuable in environments where movement or vibration could be a factor. It effectively prevents the conduit from pulling away from the box, ensuring that the electrical installation stays secure and compliant with safety standards. The combination of the lock nut and bushing also helps to avoid potential issues, such as shorts or ground faults, which can arise from improper conduit installation.

Other options, while they're used in conduit and electrical installations, serve different purposes. For instance, a straight connector is primarily used to join two segments of conduit. A condulet is typically used as a junction box for wire splicing. A conduit strap serves to secure the conduit to a mounting surface but does not directly connect to an electrical box. Understanding the specific function of each fitting is essential for proper electrical installation and maintenance.