Pex plumbing no copper

[Fordean]

If a building is completely pex tubing Except for 3 inches of copper entering concrete wall from utility Grounding electrode rule ?

 

[roger]

Are you asking about it being a GE? If it meets the requirements of being a GE per 250.52(A)(1) then you have to use it.

 

[infinity]

Except for 3 inches of copper entering concrete wall

If the copper pipe on the other side of the wall buried for at least 10'? Then as Roger stated it's an electrode and must be used as part of the GES.