Greetings. I'm having a little trouble getting absolutely information on the best and safest way to ground my 320A service.
I'm coming from 200A service and have never used double lugs before. I am afraid that I could overlook a possible safety or code violation. I know that every sub-panel needs the neutral and ground unbonded, but I'm failing to understand what that means for grounding rod situation between both main panels.
Can I use the same two ground rods for both mains (as shown in the first image) or does that create a potential issue if there's a surge? Do I need to then have 4 ground rods so each have 2x 5/8" 10 foot copper rods spaced 8' apart (as shown in the second image)? If neither of these, what is the correct solution or best practice?
Thank you for your time and assistance.
I'm coming from 200A service and have never used double lugs before. I am afraid that I could overlook a possible safety or code violation. I know that every sub-panel needs the neutral and ground unbonded, but I'm failing to understand what that means for grounding rod situation between both main panels.
Can I use the same two ground rods for both mains (as shown in the first image) or does that create a potential issue if there's a surge? Do I need to then have 4 ground rods so each have 2x 5/8" 10 foot copper rods spaced 8' apart (as shown in the second image)? If neither of these, what is the correct solution or best practice?
Thank you for your time and assistance.
