For conduits used as service masts, what must hubs be?

The requirement for hubs used in service masts to be identified is essential for proper installation and safety. Identifying the hubs ensures that they are suitable for the intended application, which includes their compatibility with the conductors and mechanical strength needs. Identified hubs help in specifying which types are to be used based on the National Electrical Code requirements, ensuring that they comply with the appropriate standards for structural integrity and protection against environmental factors.

While insulation, color-coding, and reinforcement can have their roles in electrical installations, they don't reflect the specific identification requirement needed for hubs in service masts. This underscores the importance of using components that are clearly marked or listed to ensure that they meet safety standards and suitable usage in electrical service entries.