Separately Derived Systems shall be bonded on the secondary side of the unit.

• A. True
• B. False
• C. Only on the primary side
• D. Not specified

Answer: (A)

Separately derived systems need a defined grounding point on their own side to provide a stable fault path and a common reference for all secondary equipment. Bonding on the secondary side of the unit ties the neutral to ground right at the source of the derived system, creating a single-point ground for the SDS. This ensures that fault current has a clear path back to the source and that the equipment enclosures sit at ground potential, which improves protection for personnel and equipment. Bonding on the primary side would connect to the utility ground before isolation, potentially creating multiple grounding paths and inconsistent voltages on the secondary side, which can compromise safety and tripping performance. So, the statement is true.