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Re: CSST
Well, as CSST is metal pipe, it needs to be grounded. What harm can come from grounding it even if the manufacturer does not require it.
I started reporting ungrounded CSST about a year ago. I seldom get any arguments over it being grounded and when I do I just send a snip of the code to the folks.
The problem is that the CSST pipe is so thin that lighting will punch a hole in it unlike black pipe. With the ground wire this gives the lighting a path to the ground. Kind of a simple explanation but I think it covers it fairly well.
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