What is a requirement for the grounded conductor of a branch circuit that is 6 AWG or smaller?

The requirement for the grounded conductor of a branch circuit that is 6 AWG or smaller is that it must be without splices. This is important because a solid and continuous electrical path is necessary for the grounded conductor to ensure safety and efficiency in the electrical system. Splices can introduce potential points of failure, which may lead to increased resistance, overheating, or even failure of the electrical system, thereby posing safety risks such as equipment damage or electrical shock hazards.

While the other options may suggest alternative conditions, they do not meet the specific requirements set forth in the National Electrical Code (NEC) and other electrical safety standards. The grounded conductor's integrity is paramount; hence, it is mandated that no splices be present in conductors rated at 6 AWG or smaller.