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The correct answer of four 90° bends in a 50-foot Schedule 40 PVC conduit run aligns with the National Electrical Code (NEC) regulations. According to the NEC, for conduit runs that are straight (such as the 50-foot example provided), the maximum number of bends allowed before a pull point is required is typically four. This is in order to ensure that wires can be easily pulled through the conduit without excessive stress or the risk of damage.

Exceeding this limit can make it excessively difficult to run conductors through the conduit, leading to potential complications during installation. To maintain smooth and efficient pulling, it is advisable to keep the number of bends minimal and, when necessary, utilize pull boxes or junction boxes strategically to facilitate longer runs with multiple bends.

A rationale based on common industry practice also supports this limit, as conducting electrical installations efficiently and safely is paramount. Therefore, knowing the maximum number of bends helps electricians plan their conduit layout effectively, ensuring compliance with code and enhancing the overall integrity of the installation.