What is the main purpose of using insulating bushings in conduit installations?

The main purpose of using insulating bushings in conduit installations is to prevent damage to conductors. Insulating bushings serve as protective devices installed at the ends of conduit runs where wires or cables enter or exit the conduit. They create a smooth transition for conductors, minimizing the risk of abrasion and other mechanical damage that can occur due to rough edges or metal projections at the conduit terminus. This added layer of protection helps to maintain the integrity of the conductors and prevent potential electrical failures or short circuits that could occur due to damaged insulation.

While aesthetics, support, and circuit indication may be important considerations in various electrical installations, they do not represent the primary function of insulating bushings. The primary focus here remains on safeguarding the conductors as they traverse through the conduit system, thereby ensuring a safer and more reliable electrical installation.