What must be grounded in electrical installations?

What must be grounded in electrical installations?

• A. Metal conduit only
• B. Metal conduit, raceways, and junction boxes
• C. Only the equipment enclosures
• D. Only the protective earth conductor

Answer: (B)

All metal parts that could become energized must be bonded to the equipment grounding conductor. This creates a low-impedance path for fault current so any exposed metal surfaces stay at earth potential and protective devices trip quickly, reducing shock risk. Metal conduit, raceways, and junction boxes are all potential fault surfaces in a wiring system, so they all need to be grounded. The protective earth conductor provides the actual path to earth, but bonding these metal parts to that conductor is what keeps the entire system safe. Grounding only some parts or focusing solely on the earth conductor would leave other metal components vulnerable, which is why grounding metal conduit, raceways, and junction boxes is the best answer.

All metal parts that could become energized must be bonded to the equipment grounding conductor. This creates a low-impedance path for fault current so any exposed metal surfaces stay at earth potential and protective devices trip quickly, reducing shock risk. Metal conduit, raceways, and junction boxes are all potential fault surfaces in a wiring system, so they all need to be grounded. The protective earth conductor provides the actual path to earth, but bonding these metal parts to that conductor is what keeps the entire system safe. Grounding only some parts or focusing solely on the earth conductor would leave other metal components vulnerable, which is why grounding metal conduit, raceways, and junction boxes is the best answer.