That’s another reason why I don’t believe that metal sheathing was intended to be included in the requirements of 250.104[C].
If the building had 750 kcmil CU service conductors, according to Table 250.66, you would need to bond the metal sheathing with a minimum 2/0 CU conductor.
I'm just wondering where and how would the lug for the 2/0 conductor get securely attached to the thin metal sheathing used on steel buildings?
