pex repipe

My house is old galvanized pipe which I am considering having repiped using Wirsbo pex. In the course of getting a couple of estimates I forgot to ask a question I have been wondering about. My house has updated electrical with 2 grounding rods from the main panel although the house is old-1938. I have crawled through every inch of crawlspace under the house and do not see any grounding wires connected to the pipes. How do plumbers ensure that any grounding path using the galvanized pipe has not been broken? The reason I asked this is that the old galvanized pipe still remains when the new pex is installed around it. Thanks.

You will need to have an electrician come out and drive an axillary ground rod.

I'm pretty sure you will need a new ground rod driven. Electricians can check the contineuity (spelled wrong, but that's what you get this PM) That will tell them if the wire is broken. However, with what you are doing, I think a new rod will be required. NOTE: I'm sure not an electrician, heck, I'm not a plumber either so take this for what it's worth.

He has two already. Isn't one an aux.?

The mods should probably bump this over to the electrical forum.

grounding

You say you have two grounding rods installed. If that is true, WHY would you need a bond to the old galvanized piping. That was only needed when the panels did not have the ground rod, and the grounding was through the water piping to the buried water supply service line. Now, if you still had telephone ground clamps on the old piping IT would have to maintain its path to the main service, or be relocated to a good ground source.