“CSST gas piping systems, and gas piping systems containing one of more segments of CSST, shall be bonded to the electrical service grounding electrode system or, where provided, lightning protection grounding electrode system”
- National Fuel Gas Code 7.13.2
“The bonding jumper shall connect to a metallic pipe, pipe fitting, or CSST fitting.”
-National Fuel Gas Code 220.127.116.11
"The bonding jumper shall not be smaller than 6 AWG copper wire or equivalent."
-National Fuel Gas Code 18.104.22.168
CSST (corrugated stainless steel tubing) is widely used for gas lines and is a preferred method due to its flexibility and durability but must be bonded (grounded) to prevent leaks or damage from a lightning strike to the home. Bonding can be done by connecting the gas line to a grounded source such as a breaker panel, grounding rod, or cold water line via approved clamps and no smaller than 6 gauge copper wire. This is done to divert a lightning strike away from the CSST and to the grounded source.
Here is an example of bonding the CSST-
This is an example of CSST that was not bonded and struck by lightning-