Must the grounded conductor of a multiconductor cable be insulated or covered?

The grounded conductor of a multiconductor cable must indeed be insulated or covered. This requirement is based on the National Electrical Code (NEC) to ensure safety and integrity in electrical installations. Insulation or covering of the grounded conductor helps to prevent accidental contact with live parts and reduces the risk of short circuits or ground faults that can lead to electrical shock or fire hazards.

Insulating the grounded conductor is also a best practice to maintain system functionality and reliability, especially in scenarios where multiple conductors are bundled together, minimizing interference or unintended connections. Proper insulation helps protect the conductor from environmental factors that could compromise its safety, making it essential in a variety of installation scenarios, including residential, commercial, and industrial applications.