Electrician's Licensing Practice Exam

NEC Chapter 9 specifies conduit fill requirements for what type of cabling?

1. Coaxial cabling

2. Fiber-optic cabling

3. Shielded cabling

4. Low-voltage cabling

The correct answer is: Fiber-optic cabling

The National Electrical Code (NEC) Chapter 9 specifically addresses conduit fill requirements primarily to ensure safe and efficient installation of wiring and cabling systems. Fiber-optic cabling falls under these requirements due to its unique composition and installation requirements which differ from traditional copper wiring. Fiber-optic cables often have stricter bend radius and fill requirements because they are susceptible to damage from compression and excessive bending. This necessitates precise calculations regarding the number of cables that can be safely accommodated within a conduit to maintain performance integrity and prevent physical damage. Therefore, adhering to the NEC standards for conduit fill ensures that fiber-optic installations are compliant with the safety codes and capable of functioning effectively without interference or signal degradation. In contrast, other types of cabling like coaxial, shielded, or low-voltage cabling, although they may have their own installation guidelines, do not specifically fall under the conduit fill requirements outlined in Chapter 9 in the same manner that fiber-optic cabling does. This chapter specifically considers the different types and functions of wires, and fiber-optic cabling is highlighted for its unique handling and installation needs within conduits.