Under what condition can the uninsulated conductor in nonmetallic-sheathed cable be used as a current-carrying conductor?

The correct response highlights that the use of an uninsulated conductor in nonmetallic-sheathed cable as a current-carrying conductor is generally not allowed. In typical residential and commercial wiring practices, nonmetallic-sheathed cables, such as NM cable, contain insulated conductors intended to safely carry current. These insulated conductors help prevent electrical shock hazards and reduce the risk of short circuits.

Using uninsulated conductors can lead to electrical safety issues, as they could come into contact with other conductive materials, increasing the risk of short circuits or electrical fires. Proper insulation is vital for ensuring that the electricity is contained within the conductor and does not pose a hazard to individuals or property. Regulations set forth in the National Electrical Code (NEC) and other electrical safety standards outline these requirements for safety, ensuring that only insulated conductors are utilized for carrying current under typical conditions.