A 3-1/2 x 10 ft EMT conduit is a ten-foot length of electrical metallic tubing with a 3-1/2-inch trade size, commonly used for protecting and routing electrical wires. EMT is a thin-walled steel conduit that is lighter than rigid steel conduit but still provides solid mechanical protection. It is typically galvanized to resist rust and corrosion, making it suitable for indoor commercial, industrial, and certain outdoor applications when properly installed. Its smooth interior allows for easier wire pulling and cleaner long-run installations. This size is used when large cable bundles or high-capacity wiring systems need a protected pathway.