The NEC specifies the minimum radius of the conduit bends because______________.

The National Electrical Code (NEC) specifies minimum radius requirements for conduit bends primarily to prevent damage to the insulation of the conductors as they are pulled through the conduit. When conductors are installed, particularly in tight bends, there's a risk that the insulation could suffer from abrasion or stress, which might compromise the integrity and safety of the electrical system. Ensuring the minimum bend radius allows for a smoother transition of conductors, reducing the likelihood of damaging the insulation and helping maintain their operational effectiveness and safety.

While there may be practical considerations related to pull boxes or bending equipment, the primary concern addressed by the NEC is the protection of the conductors against potential damage during installation. The specified radius helps ensure that conductors can be pulled without excessive force that could harm the insulation, thereby promoting overall safety and reliability in the electrical installation.