Each aboveground portion of a gas piping system other than CSST that is
likely to become energized shall be electrically continuous and
bonded to an effective ground-fault current path. Gas piping, other than CSST, shall be considered to be bonded where it is
connected to appliances that are connected to the appliance
grounding conductor of the circuit supplying that appliance.
[NFPA 54:7.13.1]
CSST gas piping
systems shall be bonded to the electrical service grounding
electrode system. The bonding jumper shall connect to a
metallic pipe or fitting between the point of delivery and the
first downstream CSST fitting. The bonding jumper shall be
not smaller than 6 AWG copper wire or equivalent. Gas
piping systems that contain one or more segments of CSST
shall be bonded in accordance with this section. [NFPA
54:7.13.2]
Gas piping
shall not be used as a grounding conductor or electrode.
[NFPA 54:7.13.3]
Where a lightning protection system is installed, the bonding of the gas piping
shall be in accordance with NFPA 780. [NFPA 54:7.13.4]
Electrical circuits shall not utilize gas piping or components as conductors.
Exception: Low-voltage (50v or less) control circuits, ignition circuits, and electronic flame detection device circuits shall be permitted to make use of piping or components as a part of an electric circuit. [NFPA 54:7.14]
Exception: Low-voltage (50v or less) control circuits, ignition circuits, and electronic flame detection device circuits shall be permitted to make use of piping or components as a part of an electric circuit. [NFPA 54:7.14]
Electrical connections
between wiring and electrically operated control devices in a
piping system shall comply with the requirements of NFPA
70. [NFPA 54:7.15.1]
An essential safety control
depending on electric current as the operating medium
shall be of a type that will shut off (fail safe) the flow of
gas in the event of current failure. [NFPA 54:7.15.2]