What is the requirement for grounding metal elbows on service conductors installed in nonmetallic conduit and encased in concrete? Section 250.86 Exception #3 states that they do not have to be grounded if encased in a minimum of 2" of concrete but this section applies to "Other Conductor Enclosures and Raceways." Section 250.80 applies to Service Raceways but the exception in this section only mentions 18" of cover and does not include the wording with regard to concrete encased. Is it the intent to require grounding metal elbows in service raceways that are encased in 4" of concrete?
Rick Roof, P.E.
RWR Engineering
Rick Roof, P.E.
RWR Engineering