Bonding Other Metal-Piping Systems [250.104(B)], 2023 NEC

When a fault occurs in an electrical appliance, like a gas range, the connected metal gas piping could become energized exposing users to possible electric shock or fires caused by pinhole leaks in the gas piping caused by arcing.

To eliminate these hazards, metal gas piping must be properly bonded per NEC 250.104(B). This section covers metal piping systems, including gas piping, when they’re likely to become energized.

Want to learn more? Join Mike and the team in the video as they break down NEC 250.104(B) and explain exactly what you need to know about bonding metal gas piping systems.

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[karlringsdorf]

We have had to bond gas piping systems for as long as I can remember here in MD. Fairly simple, ground the water pipe, bond it at the water heater; hot/cold/gas call it done. Until CSST came along, and well it was not that easy any longer. I have found that we follow the manufactures recommendations to bond it at the customer side of the gas meter or at the manifold.

[Devin-_-]

Thank you for all you and your team do. I just passed my exam today!

[samueltaylor]

The corrugated stainless gas tubing is connected to the rigid gas line and to the appliance with brass fittings, which essentially bonds all three together. Why would you need to jumper it to bond it?!

[RDZ]

CSST is metal, connected to a metal pipe. Therefore isn’t it bonded along with the black iron pipe it branches off from? Why the additional bonding beyond the EGC from the range, dryer, etc?

[krisniemczuk]

Doesn't code require all metallic piping attached to and inside the building to be bonded which means including gas?

[garbo]

Retired and read Mike's & Charlie Trout code question of the day & EC& M magazine but not up on all the latest codes. Maybe ten years ago at an IAEI continuing education class they stated you must follow the manufactures instructions for bonding CSST. Sure there are st least halve a dozen companies that manufacture CSST. So at least back then might be 6 different methods of bonding CSST. Always thought it would be a lot safer if the NEC made you bond both ends of fireplace CSST with #6 copper like Mike Shown at 7:40 in this very informative vidio. Did anybody every run say 100 Amps, then 1, 000 amps thru 1/2" CSST and measure the voltage drop ?

[kangaroogod]

We are required to jumper the hot/cold/gas.. if they had a gas tankless water heater then they would then be bonded together? 🤔

[williamsmith]

You should send this to pgw Philadelphia gas works

[othalee]

I think the grounding conductor is ok if gas is hard piped. But if a flex is used, it's not ok. Also, the bond has to be a number 6, and the grounding conductor is not that big.

[bryansmith]

Why slam NFPA 54 and turn around and state they are saying exactly the same thing that NEC is saying?