New York State Master Electrician Practice Exam

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What is the minimum radius for a field bend on trade size 1 1/4 RMC?

6 inches
8 inches
10 inches
12 inches

The correct answer is: 8 inches

The minimum radius for a field bend on trade size 1 1/4 RMC (Rigid Metal Conduit) is indeed 8 inches. Understanding the significance of the bending radius is crucial in ensuring that the conduit maintains its structural integrity while allowing for safe and effective electrical installations. The 8-inch minimum bend radius is in accordance with the guidelines set forth in the National Electrical Code (NEC) and industry standards for conduit bending. Bending a conduit to a radius smaller than the specified minimum can cause deformation, increased stress on the conduit material, and potential damage to the wires within, leading to unsafe installation conditions. In contrast, larger values such as 10 or 12 inches are acceptable in certain scenarios or for specific types of conduit but do not represent the standard minimum requirement for this size of RMC. Thus, opting for a bend radius of 8 inches ensures compliance with regulations and promotes the longevity and safety of the electrical system.