Flexible coated gas piping (CSST)? is being used in homes. It is spiral steel tubing with a Nonmetallic jacket. Usually yellow. 250.104 NEC requires piping that may become energized to be bonded. A gas appliance with a 20 amp circuit gets bonded with the ground wire in the circuit (250.66).
The flexible gas piping is failing in some areas due to lightning. The pipe manufacturer requires it to be bonded with the same size GEC as used for the service (250.122 NEC) The bond must also be on the Black iron pipe part of the system or at one of the connectors for the tubing. Never on the tubing.
It seems like the installers & makers of the flexible gas pipe are shifting the responsibility for their product onto the electrician to protect it against lightning, something the electrical code isn't designed to do.
What do you think about this ?
Alan--
