If both DC converters fail, which buses would be lost?

If both DC converters fail, which buses would be lost?

• A. All DC Secondary buses
• B. AC buses
• C. Battery only
• D. Both the #1 and #2 DC Primary buses

Answer: (D)

The power path that feeds the DC Primary buses relies on the DC converters. Those converters are the source that provides DC power to the primary distribution. When both converters fail, there is no supply for the DC Primary buses, so those buses are lost. The AC buses stay powered by the engine generators, and the DC Secondary buses are fed through a different route, which means they aren’t necessarily lost just because the DC converters failed. So the primary DC buses would be lost, while the others could remain energized depending on the remaining power paths.

The power path that feeds the DC Primary buses relies on the DC converters. Those converters are the source that provides DC power to the primary distribution. When both converters fail, there is no supply for the DC Primary buses, so those buses are lost. The AC buses stay powered by the engine generators, and the DC Secondary buses are fed through a different route, which means they aren’t necessarily lost just because the DC converters failed. So the primary DC buses would be lost, while the others could remain energized depending on the remaining power paths.