dnk,
(A) Metal Water Piping. The metal water piping system shall be bonded as required in (1), (2), (3), or (4) of this section. The bonding jumper(s) shall be installed in accordance with 250.64(A), (B), and (E). The points of attachment of the bonding jumper(s) shall be accessible.
(1) General. Metal water piping system(s) installed in or attached to a building or structure shall be bonded to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor where of sufficient size, or to the one or more grounding electrodes used. The bonding jumper(s) shall be sized in accordance with Table 250.66 except as permitted in 250.104(A)(2) and (A)(3).
Ryan's point is that the code rule requires bonding for all metal water piping systems, not just those that are 'likely to become energized". Note that the words "likely to become energized" do not appear in the section that you cited. They do appear in 250.104(B) and (C) for other metal piping sytems and structural steel, but not in (A) for water piping systems.
Don
