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nonmetallic water piping, the interior metal water piping system for each occupancy shall be permitted t~ be bonded to the equipment grounding terminal of the panelboard or switchboard enclosure (other than service equipment) supplying that occupancy. The bonding jumper shall be sized in accordance with Table 250-122. :c~~t~~i'~ (3) Multiple Buildings or Structures Supplied from a Common Service. The interior metal water piping system shall be bonded to the building or structure disconnecting means enclosure where located at the building or structure, or to the equipment grounding conductor run with the supply conductors, or to the one or more grounding electrodes used. The bonding jumper shall be sized in accordance with Section 250-122 based on the rating or setting of the largest overcUITent device protecting the feeder(s) or branch circuit(s) that supply the building. (4) Separately Derived Systems. The grounded conductor of the separately derived system shall be bonded to the nearest available point of the interior metal water piping system in the area served by the separately derived system. This connection shall be made at the same point on the separately derived system where the grounding electrode conductor is connected. The bonding jumper shall be sized in accordance with Table 250-66. 'rc~e::hiJ X(b) Metal Gas Piping. Each aboveground portion ofa gas piping system upstream from the equipment shutoff valve shall be electrically continuous and bonded to the grounding electrode system. (c) Other Metal Piping. Interior metal piping that may become energized 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 shall be sized in accordance with Table 250-122 using the rating of the circuit that may energize the piping. The equipment grounding conductor for the circuit that may energize the piping shall be permitted to serve as the bonding means. FPN: Bonding all piping and metal air ducts within the premises will provide additional safety. (d) Structural Steel. Exposed interior structural steel that is interconnected to form a steel building frame and is not intentionally grounded and may become energized 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 shall be sized in accordance with Table 250-66 and installed in accordance with Sections 250-64(a), (b), and (e). The points of attachment of the bonding jumpers shall be accessible. f.ic..'~. ''"';;,,1 ~":'rl .. . . .. .. . . 250-106. Lightning Protection Systems The lightning protection system ground terminals shall be bonded to the building or structure grounding electrode system. J~-.:t~a FPN No.1: See Section 250-60 for use of air terminals. For further information, see Standard for the Installation of Lightning Protection Systems, NFPA 780-1997, which contains detailed information on grounding, bonding, and spacing from lightning protection systems. FPN No.2: Metal mceways, enclosures, frames, and other noncurrent-carrying metal parts of electric equipment installed on a building equipped with a lightning protection system may require bonding or spacing from the lightning protection conductors in accordance with Standardfor the Installation of Lightning Protection Systems, NFPA 780-1997. Separation from lightning protection conductors is typically 6 ft (1.83 m) through air or 3 ft (0.92 m) through dense materials such as concrete, brick, or