Does flexible CSST gas line need to be bonded and grounded for lightning protection?
Yes, CSST, that yellow or black flexible corrugated gas tubing, must be electrically bonded to your home's grounding system. Both the fuel-gas code and every CSST manufacturer require it. Bonding gives a lightning surge a safe path so it can't arc through the thin tubing wall and start a fire. We bond every run we install and check existing ones.
Why CSST needs bonding, not optional
That flexible corrugated gas tubing, CSST, usually yellow or a black arc-resistant jacket, must be electrically bonded to your home's grounding system. Both the fuel-gas code and every CSST manufacturer require it.
The reason is physics: CSST's wall is far thinner than old rigid black iron, so a nearby lightning strike can energize the tubing and, without a bonding path, arc through the wall and ignite. Bonding gives that surge somewhere safe to go.
Why we take this seriously in the mountains
Western North Carolina gets its share of hard summer thunderstorms, and homes on ridgelines and exposed knobs take the brunt of it.
We regularly open walls in older remodels and find CSST that a previous installer ran but never bonded, a quiet hazard the homeowner never knew about. If your home has CSST, it's worth confirming the bond is there and sized right, especially before you add another gas appliance to the system.
How we install and verify it
On every CSST run we install, we bond it per code to the grounding electrode system and document it for the inspector, the same inspection that pressure-tests the line. Where a job calls for it, we can use black-jacketed arc-resistant CSST or fall back to rigid pipe.
Either way, the protection is built in, not hoped for. If you're adding a fireplace or want an existing line checked, call (828) 545-0525.
How we can help
Related questions
- Can flexible gas line (CSST) be used to connect a fireplace?
- What license should someone have to install a fireplace gas line?
- Does a new fireplace gas line need to be pressure tested or inspected?
- Does my existing gas line have enough capacity to add a fireplace?
- Where should the shut-off valve for a gas fireplace be located?
- How do I know if my house has natural gas or propane?
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