Journeyman Electrician Practice Exam 2025 - Free Electrician Practice Questions and Study Guide.

The maximum size cable allowed for use without additional support between boxes in the closed construction of a manufactured building is indeed determined by pertinent codes and standards regarding electrical installations. In this case, the answer of 10 AWG is appropriate because it aligns with the National Electrical Code (NEC) stipulations, which specify that conductors larger than a certain gauge require additional support to prevent sagging or damage.

When installing electrical cables, especially in manufactured or modular buildings, maintaining proper support is crucial to ensure safety and adherence to code. Cables that are larger than 10 AWG, such as 8 AWG or larger conductors, are considered to be more susceptible to not being supported adequately in certain configurations without additional support measures in place. Hence, limiting the maximum size of the cable alleviates concerns about mechanical stress and potential insulation damage that would arise from inadequate support.

In summary, the choice of 10 AWG reflects a balance between safeguarding electrical integrity and ensuring compliance with the requirements established for the construction type in question.