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Re: CSST bonding
From the NEC. (bold and underlining are mine)
- 250.104 Bonding of Piping Systems and Exposed Structural Steel.
- - (B) Other Metal Piping. Where installed in or attached to a building or structure, metal piping system(s), including gas 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(s) shall be sized in accordance with 250.122 using the rating of the circuit that may energize the piping system(s). The equipment grounding conductor for the circuit that may energize the piping shall be permitted to serve as the bonding means. The points of attachment of the bonding jumper(s) shall be accessible.
- - - FPN: Bonding all piping and metal air ducts within the premises will provide additional safety.
That states *what*, which pretty much controls *where* (to some degree, they could, of course, run really long bond conductors).
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