Most, if not all, of the service grounding system conductors are sized based on table 250.66, or table 250.66 but not less than 12.5% of the service conductors if over 1100 kcmil (copper). My concern is not properly identifying the conductor could lead to improper sizing of the conductor. If a conductor is sized on 250.66 it would not be required to be larger than #3/0 AWG (copper). But if it is required to be not less than 12.5% of the service conductors, it could be required to be much larger.
I have attached a grounding detail I have been working on and hope you can help identify the conductor from the service equipment to an external main ground busbar and the conductor between external ground busbars, or let me know if i have misidentified any of the conductors or code references.
Thanks,
I have attached a grounding detail I have been working on and hope you can help identify the conductor from the service equipment to an external main ground busbar and the conductor between external ground busbars, or let me know if i have misidentified any of the conductors or code references.
Thanks,
