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Home / Safety / Indoor Safety
Corrugated stainless steel tubing (CSST) is a flexible tube sometimes used to supply natural gas in homes and businesses.
Used since 1990, CSST may have been used for natural gas piping in your home if you added a new natural gas appliance such as a stove or furnace.
Danger: Improperly bonded and grounded CSST can result in natural gas leaks or fires in buildings struck by lightning. CSST is often coated in yellow or black.
Do not confuse CSST with natural gas appliance flexible connectors.
Flexible connectors typically attach directly to natural gas appliances from a floor or wall appliance shut-off valve.
CSST typically is routed beneath, through or along floor joists in the basement, inside interior wall cavities and on top of ceiling joists in attic spaces.
In Wisconsin, all CSST, regardless of manufacturer exemptions, must be bonded and grounded.
First generation CSST must be bonded to the structure’s electrical system in accordance with NFPA 70 - National Electrical Code (NEC),
and NFPA 54 - National Fuel Gas Code, using bonding clamp(s) and wire sized appropriately per the manufacturer’s instructions.
Inspect: If you have CSST installed at your home or business, contact a licensed electrician to verify proper bonding.
If not, the electrician can install proper bonding. If you’re not sure if you have CSST, contact the company that installed the natural gas piping
in your home or business and ask for an inspection.