Which of the following best describes the protection arrangement for the conductors described as Conduit II being protected by a three‑pole 80‑amp circuit breaker?

• A. Protects three hot conductors with a single device
• B. Protects a single hot conductor with a fuse
• C. Protects neutral and one hot conductor
• D. Protects ground and neutral only

Answer: (A)

The main idea is simultaneous protection of multiple hot conductors with one device. A three-pole breaker is designed to interrupt all three current-carrying conductors together, so if any one conductor carries too much current, the device trips and disconnects all three. This ensures no neutral or other conductor remains energized while some hots are disconnected, which helps prevent shock and equipment damage on multi‑wire or three‑phase circuits. In the scenario, Conduit II contains three hot conductors, so a single three-pole 80‑amp breaker protects them all with one trip mechanism.

The other options don’t fit because they describe protecting a single hot conductor with a fuse, or protecting neutral (and a hot) or ground/neutral only—none describe a single device protecting three hot conductors at once, as a three-pole breaker does.