The correct answer isB. NFPA 70, which governs installation requirements for electrical raceway systems, limits conduit runs between pull points such as outlet boxes, junction boxes, conduit bodies, or pull boxes tono more than the equivalent of four quarter bends, or 360 degrees total. This rule applies to rigid metal conduit and is intended to ensure that conductors can be installed, pulled, and replaced without excessive mechanical stress or insulation damage.
From a source inspection and quality surveillance perspective, this requirement is important because conduit routing directly affects installation quality, conductor integrity, and maintainability. Excessive bends increase pulling tension and sidewall pressure, making conductor damage more likely during installation. Too many bends can also complicate future maintenance and cable replacement. During inspection of electrical systems, the source inspector verifies that conduit design, fabrication details, and installation-related drawings align with code requirements and do not introduce nonconforming field conditions.
Option A exceeds the code limit. Options C and D introduce bend-radius conditions that do not replace the fundamental NFPA 70 maximum of360 degrees between pull points. Therefore,Bis the verified answer.