A quote from 250.4 (B)UNGROUNDED SYSTEM (2) , "[equipment bonding] shall be connected together and to the supply system grounded equipment."
Does the "supply system grounded equipment" indicate that the supply system is system-grounded? Or does that just mean that the suuply system's equipment bonding is connected to earth? (because an ungrounded system's equipment bonding gets connected to earth, but not to the power source)
