What is the difference between rigid metal conduit (RMC) and electrical metallic tubing (EMT)?

What is the difference between rigid metal conduit (RMC) and electrical metallic tubing (EMT)?

• A. RMC is lighter, easier to bend; EMT is heavier and thicker-walled.
• B. RMC is heavier, thicker-walled steel; EMT is lighter, easier to bend and install.
• C. RMC is plastic; EMT is metal.
• D. RMC is corrosion resistant; EMT is not.

Answer: (B)

The difference being tested is how the conduit’s construction affects weight, rigidity, and ease of installation. RMC is a heavy, thick-walled steel conduit designed to be rigid and highly protective; it’s much heavier and requires threaded fittings, so it’s less flexible and takes more effort to install. EMT is thin-walled, lighter, and easier to bend and install, with snap-on or set-screw fittings that speed routing. This leads to practical choices: use RMC for exposed or rugged applications where strong protection is needed, and use EMT for indoor dry locations where quick, flexible runs are advantageous. So the statement that RMC is heavier and thicker-walled and EMT is lighter, easier to bend and install best reflects the real differences.

The difference being tested is how the conduit’s construction affects weight, rigidity, and ease of installation. RMC is a heavy, thick-walled steel conduit designed to be rigid and highly protective; it’s much heavier and requires threaded fittings, so it’s less flexible and takes more effort to install. EMT is thin-walled, lighter, and easier to bend and install, with snap-on or set-screw fittings that speed routing. This leads to practical choices: use RMC for exposed or rugged applications where strong protection is needed, and use EMT for indoor dry locations where quick, flexible runs are advantageous. So the statement that RMC is heavier and thicker-walled and EMT is lighter, easier to bend and install best reflects the real differences.