If your home or business was built after 1990 or you’ve had work done to your natural gas system, Corrugated Stainless Steel Tubing (CST) may have been installed.
CSST is a flexible stainless steel pipe and has a yellow or black plastic coating. CSST does not connect directly to appliances, but instead it runs through a home or business – sometimes under floors, along sidewalls and in the attic.
If lightning strikes a structure containing CSST, there is a risk it can travel along the structure’s natural gas piping system and cause a leak or, in some cases, a fire.
CSST gas piping systems shall be bonded to the electrical service grounding electrode system or, where provided, lightning protection ground electrode system. The bonding jumper shall not be smaller than 6 AWG copper wire or equivalent and no longer than 75 feet. The CSST gas piping shall not be used as a ground conductor or electrode.
Alliant Energy does not provide inspection service for CSST installations.
If you find CSST after inspecting your home or business, Alliant Energy recommends that you contact a licensed electrician to make sure it’s bonded and grounded properly.
If you are unsure whether your building contains CSST, contact a building inspector to obtain a professional inspection.
Refer to the National Fire Protection Association 54: National Fuel Gas Code, Section 7.13 Electrical bonding and grounding. A good web resource can be found at http://www.csstsafety.com/