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ahmed elgazar
moke system activation, signal to  activte  smoke system  cab sent from  smoke detector  of  water flow  switch  in  sprinkler system  i ask  about  case that recommended used onley water flow switch  instead of  detectors.
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Joe Nelson
NEC 2017 680.26(B) states that conductive pool shells shall be bonded. 680.26(B)(1) states that, "Vinyl liners...shall be considered to be nonconductive materials." Some pool construction methods that utilize nonconductive vinyl liners also utilize a (unreinforced) concrete base (or shell) between native soil and the vinyl liner material. 
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