Which statement about CSST bonding and grounding is true?

Which statement about CSST bonding and grounding is true?

• A. Bonding is optional in most cases.
• B. Bonding is only required for certain installations.
• C. Bonding is primarily to improve gas flow.
• D. Bonding is important to minimize static or lightning-related damage by providing electrical grounding to the piping.

Answer: (D)

Bonding CSST provides a safe electrical path to the building’s grounding system, so the piping stays at the same electrical potential as the rest of the structure. This matters because CSST is a metal flexible gas line that can accumulate static electricity or become energized during a lightning event or due to nearby electrical faults. If the piping carries a voltage different from the building ground, a spark could jump to nearby materials or ignite leaking gas. Installing a bonding clamp on the CSST (or an adjacent rigid section) and running a properly sized copper bonding conductor to the building’s grounding electrode system gives any stray current a direct route to ground, reducing the risk of arcing and fire. This safety measure is required in many installations and is about electrical safety, not about improving gas flow or being optional in most cases.

Bonding CSST provides a safe electrical path to the building’s grounding system, so the piping stays at the same electrical potential as the rest of the structure. This matters because CSST is a metal flexible gas line that can accumulate static electricity or become energized during a lightning event or due to nearby electrical faults. If the piping carries a voltage different from the building ground, a spark could jump to nearby materials or ignite leaking gas. Installing a bonding clamp on the CSST (or an adjacent rigid section) and running a properly sized copper bonding conductor to the building’s grounding electrode system gives any stray current a direct route to ground, reducing the risk of arcing and fire. This safety measure is required in many installations and is about electrical safety, not about improving gas flow or being optional in most cases.