All questions and answers are based on the 2011 NEC. Q. What are the grounding electrode requirements for a separately derived system, such as a transformer? [250.30(A)(4)] A. First of all, let’s ...
(1) Below permanent moisture level. If practicable, pipe electrodes must be embedded below the permanent moisture level and be free from nonconductive coatings such as paint or enamel. Exception: A ...
Corrugated stainless steel tubing (CSST) has been widely used for natural and propane gas systems. Not all mechanical contractors embraced CSST, but the potential labor savings certainly were ...
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