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Wednesday, December 16, 2020
Question:
Greetings, and thank you for a valuable forum. Should underground fire sprinkler supply piping be included in NEC 250.52(B)?
Kelly Stockwill
A
Answer:
Hello Kelly,
Thanks for the comments. Section 250.52(B) does not include underground water piping that meets the requirements of a grounding electrode and is installed for sprinkler protection. The NEC does not differentiate here and requires that all underground metal piping systems be part of the grounding electrode system for a building or structure served.