There are five ½-in. rigid metal conduits installed underground and connected to gasoline-dispensing equipment and other associated equipment. One of the rigid conduits contains power circuit wiring for the pump motor. One of the rigid conduits contains the wiring for the lights on the island. One of the rigid conduits contains control circuit wiring for the pump. One rigid conduit contains wiring for intercom and speakers. Which, if any, of these conduits shall be bonded and grounded?

  1. All five of them.
  2. Only the rigid conduit containing power conductors for the pump motor.
  3. Only the rigid conduit containing the lighting conductors.
  4. Both the power and lighting conduits (b and c).

Answer: A

As noted in the first sentence of 514.16 [Grounding and Bonding], "All metal raceways, the metal armor or metallic sheath on cables, and all non-current carrying metal parts of fixed portable electrical equipment, regardless of voltage, shall be grounded and bonded."

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.