When are protective bushings typically recommended during conduit installation?

Protective bushings are specifically recommended when conductors pass sharp edges during conduit installation. The primary purpose of a protective bushing is to shield the conductors from physical damage that could occur due to sharp edges at the ends of the conduit. These edges can create wear and tear on the insulation of the conductors, which might lead to short circuits or electrical failures. By using protective bushings, electricians ensure the longevity and safety of the electrical system by providing a smooth transition and preventing potential damage to the conductors as they enter or exit the conduit.

For other scenarios such as exposure to sunlight, buried conduits, or the use of multiple conductors, different measures might be recommended to ensure the integrity and safety of the installation, but they do not specifically address the risk that sharp edges pose to conductors.