To determine where a box or conduit body must be used according to the National Electrical Code (NEC), we need to reference the specific rule governing this requirement.
Based on the correct answer, we know that the relevant NEC rule is:
300.15
This rule specifies the conditions and locations where a box or conduit body must be used, ensuring the safety and integrity of electrical installations. Such provisions help in maintaining secure connections, protecting conductors, and preventing hazards associated with exposed wiring connections.
