blueman wrote:

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?

No.

- Is it recommended?

No, each utility does its own thing. Let the phone, and cable companies
run their own grounds, to the unified ground of the electrical system.

Grounding is much less a concern to the gas company with their
underground architecture than it is to the electric and phone companies
with their aerial ones.

- Should one use the same gauge wire as for the water pipe?

Yes, same gauge wire for all your grounding runs.

- Any special considerations?

The galvanic corrosion problem mentioned refers mixing the types of
materials on the pipes and wires, don't use a copper grounding clamp on
an iron pipe, and vice versa.

- Can I daisy chain it from the water pipe or do I need to run a
separate ground back to the panel?

A gas appliance, such as a furnace or range, that has an electrical
hookup, will ground the gas line(s) that are connected to it, so you
don't need to worry about it.

You need to "jump" over anything that is removable, such as the water
meter, and the water heater, so that the plumbing is always grounded
even if something is removed.

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