The length of the flexible connector is generally limited to 3 feet, except for gas stoves and clothes dryers. Most of the gas codes I'm familiar with have a similar arrangement that applies only to underground gas lines, not to in-wall pipes. This clever renovation of traditional black steel pipes allows natural gas to travel to your fireplace, oven, stove and any other appliance that uses natural gas. CSST was first developed in Japan and then in the United States by the gas industry to provide a better and safer gas distribution system.
Talking about the condition of your gas lines, knowing what type you have is key to determining if your home is at risk of fire or gas line leakage. Subsequently, the American Gas Association and its research division, the Gas Research Institute, developed a coiled tubing design for the United States. In the current edition of the National Combustible Gas Code and the International Combustible Gas Code, the CSST must be attached to the electrical ground of the building with a minimum wire of 6 AWG. As I mentioned in my original post, I see gas lines installed on walls in my area, but I also keep reading that gas lines cannot be buried in walls or between floors of two-story houses.
Joining gas pipes to the electric service is the right way to provide electrical protection to the gas piping system. The CSST ranges from the gas meter or propane source to the gas appliances through the basement, walls and attic, depending on the type of construction. You may very well need to hire a local gas plumber to install the actual gas line and hire an electrician to take care of the electrical circuit if any repairs are needed.