Which conduit type is nonmetallic and corrosion-resistant?

• A. Electrical Metallic Tubing (EMT)
• B. Polyvinyl chloride (PVC)
• C. Flexible conduit
• D. Rigid steel conduit

Answer: (B)

Polyvinyl chloride conduit is nonmetallic and corrosion-resistant because it’s plastic, not metal. Plastic doesn’t rust or corrode in moisture or underground conditions, so PVC conduits maintain their strength and protecting integrity over time in damp environments. They’re also lightweight and easy to install with solvent-based joints, which helps keep costs down while keeping the interior conductors protected.

The other options are metallic conduits, which are prone to corrosion in moisture, soil, or chemical exposure. They can rust or deteriorate, reducing durability in challenging environments, and are generally heavier and more labor-intensive to install. Flexible conduit in typical use is often metal as well, so it shares the corrosion risk.