What type of conduit offers the best protection against physical damage?

Rigid metal conduit is designed to provide maximum protection for electrical wiring, making it the best choice for safeguarding against physical damage. Its robust construction, typically made from galvanized steel or aluminum, allows it to withstand significant impact and environmental stresses, ensuring that the wiring inside remains safe from external threats. This type of conduit is commonly used in industrial settings where heavy machinery or potential hazards are present, thus needing reinforced protection for electrical installations.

In contrast, other conduit types like PVC conduit can be more vulnerable to impact and harsh environmental conditions. While it is corrosion-resistant and lightweight, it does not offer the same level of physical protection as rigid metal conduit. EMT is also more susceptible to damage because, although it provides some level of protection, it is thinner-walled and less sturdy than rigid options. Lastly, flexible metal conduit, while useful for installations requiring maneuverability, offers limited protection against physical damage due to its flexibility and thinner construction.