Which statement is correct about bonding in the context of Separately Derived Systems?

• A. Split bolt connections are allowed for grounding connections.
• B. The DC Power System must be installed farthest from the PBB.
• C. Separately Derived Systems must be bonded on the secondary side.
• D. Cable trays under floor cannot be bonded.

Answer: (C)

Bonding the neutral of a separately derived system to its grounding electrode conductor on the secondary side establishes a definite grounding reference and a low-impedance fault path. Since the source is isolated from the building’s main grounding network, the SDS must have its own grounding electrode, and bonding the neutral to that electrode on the secondary side provides a reliable path for fault currents to return and trip protective devices. This keeps the system safely referenced to ground without tying into the building’s primary grounding network beyond the SDS. The other statements don’t address this required bonding relationship for a separately derived system.