A nonmetallic-sheathed feeder cable emerges from a wall in a garage and will be exposed to physical damage. Which protection method provides protection from physical damage?

A nonmetallic-sheathed feeder cable emerges from a wall in a garage and will be exposed to physical damage. Which protection method provides protection from physical damage?

• A. IMC conduit
• B. EMT conduit
• C. PVC conduit
• D. RMC conduit

Answer: (A)

When NM cable is exposed to potential impact, it must be enclosed in a raceway that can resist physical damage. Metal conduits provide this protective barrier, shielding the conductors from nails, doors, and vehicle contact. Interlocked Metal Conduit (IMC) is a rigid steel conduit that offers strong mechanical protection while being lighter and easier to install than the thick-walled RMC. That makes it a practical choice for a garage where the cable could be struck or crushed. EMT is thinner and more easily deformed, and PVC conduit, while corrosion resistant, doesn’t stand up to impact as well as metal, so it’s not as protective in a high-risk area. RMC would also meet the protection needs but is heavier and harder to install, whereas IMC gives robust protection with more manageable installation.

When NM cable is exposed to potential impact, it must be enclosed in a raceway that can resist physical damage. Metal conduits provide this protective barrier, shielding the conductors from nails, doors, and vehicle contact. Interlocked Metal Conduit (IMC) is a rigid steel conduit that offers strong mechanical protection while being lighter and easier to install than the thick-walled RMC. That makes it a practical choice for a garage where the cable could be struck or crushed. EMT is thinner and more easily deformed, and PVC conduit, while corrosion resistant, doesn’t stand up to impact as well as metal, so it’s not as protective in a high-risk area. RMC would also meet the protection needs but is heavier and harder to install, whereas IMC gives robust protection with more manageable installation.