Which issues are cited as reasons to avoid using flexible metallic conduit?

• A. Creep
• B. Shift
• C. Damage
• D. All of the above

Answer: (D)

Flexible metallic conduit is easy to route, but its flexibility brings three practical concerns. Creep is the slow deformation that can occur under long-term load and heat, which can gradually loosen terminations and alter the run. Shift happens when the conduit moves due to vibrations or temperature changes, putting stress on fittings and misaligning boxes. Damage covers its tendency to be dented, kinked, or crushed, which can harm the conduit and the wires inside. Because these issues can occur together, all of the above is cited as a reason to avoid using flexible metallic conduit.