While both pipes are buried and may be made of metal, only the water line
should be used as a ground unless it is fed by a plastic pipe. The gas line
should NEVER be used as a ground, although it should be grounded to the
building ground, because gas supply lines can also be made of plastic, and
even if it is metallic it will have an insulating fitting at the meter to
prevent interference with cathodic corrosion protection of the underground
lines.

If you have a furnace or a powered water heater and grounded wiring, the
connection through this equipment will also ground the gas lines. However, I
believe NEC requires a separate cross connection to ensure proper grounding.

"Brad" wrote in message
ups.com...
Both pipes should be at the same electric potential (ground) since
they are both are buried.
The grounding is done to help ensure the electrical panel has a true
ground.
In some cases the panel ground is wired to a long steel pole driven
into the earth. Just different ways to do the same thing.
Brad

blueman wrote:
When we had our electric service upgraded, the electrician (as
expected) ran a ground wire from the cold water main inlet to the
ground on the panel.

I read somewhere that one should also run a similar grounding wire to
the natural gas pipe inlet but the electrician didn't do that.
- Is it required by code?
- Is it recommended?
- Should one use the same gauge wire as for the water pipe?
- Any special considerations?
- Can I daisy chain it from the water pipe or do I need to run a
separate ground back to the panel?

Thanks