Redsy:
If this was service equipment supplied at any typical building supply voltage, the code would call for bonding bushings where their were concentric or eccentric rings still present, and when the voltage is over 250 volts to ground the bonding could only be accomplished in the same manner for services. See 2002 NEC 250.97
We should also remember that so-called "donuts" are not going to satisfy the bonding requirements - they are only used to correct a mistake!
