( Kitchen Equipment and pipes) bonding

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Art. 250.104(B) tells us the equipment grounding conductor of the circuit that feeds the gas equipment will take care of the bonding. If there is no circuit that feeds these gas equipments then you have to bond the gas line. I assume we are not talking about CSST- the flexible corrugated stainless steel piping usually with a black or yellow jacket

(B) Other Metal Piping. If installed in, or attached to, a
building or structure, a metal piping system(s), including
gas piping, that is likely to become energized shall be
bonded to any of the following:
(1) Equipment grounding conductor for the circuit that is
likely to energize the piping system
(2) Service equipment enclosure
(3) Grounded conductor at the service
(4) Grounding electrode conductor, if of sufficient size
(5) One or more grounding electrodes used
The bonding conductor(s) or jumper(s) shall be sized in
accordance with 250.122, using the rating of the circuit that
is likely to energize the piping system(s). The points of
attachment of the bonding jumper(s) shall be accessible.
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