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What should the conductor inside flexible metal conduit be?

  1. Plastic insulated

  2. Ground wire only

  3. For indoor use only

  4. It must be NM cable

The correct answer is: Plastic insulated

The conductor inside flexible metal conduit should be plastic insulated to ensure safety and reliability. Plastic insulation provides a protective barrier around the conducting wires, reducing the risk of electrical shock and short circuits. This type of insulation is essential for preventing moisture and other environmental factors from contacting the metal conductor, which could lead to deterioration or failure. Using plastic insulation also helps comply with electrical codes and standards, which require conductors to have appropriate insulation to handle voltage and environmental conditions safely. This choice ensures that the installation adheres to best practices in electrical work, promoting longevity and efficiency in the system. The other options mention types of conductors or specific uses that do not align with the requirements for flexible metal conduit. Ground wire only would not provide the necessary conductive path for a circuit, while stating the conduit is for indoor use only limits its applicability without addressing the insulation requirement. Stating that it must be NM cable is also incorrect since NM (non-metallic) cable is not typically used within flexible metal conduit; instead, plastic insulated conductors suited for the application would be appropriate.