Need adviceon bonding water system

[noname87]

I have a copper plumbing system in my home that has a new PEX supply (from a new well) to the shutoff valve in the crawlspace. Can I bond the copper pipes with a #4 jumper to the original buried (1 foot deep, 15' long) copper supply pipe that is bonded to the electrical panel with a #6 copper wire or should I run a #4 back to the panel?

 

[Dennis Alwon]

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