NCIDQ IDFX Practice Exam

What type of conductors must be placed in metal conduit?

1. Low voltage conductors

2. Nonmetallic sheathed cable

3. Individual plastic-insulated conductors

4. Flexible metal-clad cables

The correct answer is: Individual plastic-insulated conductors

The requirement for placing individual plastic-insulated conductors in metal conduit is primarily linked to safety and protection standards in electrical installations. Metal conduits provide a degree of physical protection against mechanical damage to the conductors, which is particularly important in environments where the risk of impact or wear is greater. Additionally, using metal conduit helps in grounding and can reduce electromagnetic interference, maintaining system integrity and improving the overall safety of electrical installations. In contrast, low voltage conductors, nonmetallic sheathed cables, and flexible metal-clad cables have different requirements. Low voltage conductors often can be run without the protection that metal conduit provides. Nonmetallic sheathed cables typically have their own protective sheath and are suitable for various residential applications without the need for additional conduit. Flexible metal-clad cables also have built-in protection and are designed for flexible applications, negating the requirement for additional metal conduit. Therefore, the necessity for conduit is specifically applicable to individual plastic-insulated conductors, ensuring they receive the appropriate level of protection and safety in their installation.