I was just reading the bible (code book of course), and now I am confused. I have always used the meathods in 250.30 for hooking up the grounding electrode to the derived neutral. 250.30(a)(3) states "the grounding electrode shall be the nearest one of the following, grounded metal structure, grounded metal water pipe within 5' of entrance, or other electrodes. I have always used the grounded metal structure as it has always for me been the closest. So I have never gone to the water pipe. Now I read 250.104(a)(4), it states that the grounded conductor of the seperatly derived system shall be bonded to the nearest available point of the interior metal water piping system. I have never seen anyone else do this either? Have I and all the installations I have seen been missing this? Thanks............Brian
