Does the NEC require you to ground piping systems and structural steel? Be careful how you answer this question.
Find more from this series on Grounding vs Bonding
All Code references are based on the 2005 NEC. The grounding and bonding requirements in this column apply to solidly grounded systems that operate at not more than 600V, such as 120/240V, 120/208V, and 277/480V. You've probably seen project requirements that call for the grounding of piping systems and exposed structural steel. Those requirements, although well intended, miss the mark. The stated