In the described generator setups, the distribution panelboard is fed from a generator that provides what voltage?

In the described generator setups, the distribution panelboard is fed from a generator that provides what voltage?

• A. 208 V
• B. 240 V
• C. 480 V
• D. 600 V

Answer: (C)

When powering a distribution panelboard from a generator, the important point is that the generator’s output must match the panel’s rating. In many industrial-style generator setups, the panelboard is designed to be fed with three-phase 480 V. Feeding at 480 V three-phase lets you deliver the same amount of power with lower current, which means smaller conductors, less voltage drop, and generally more efficient operation for larger loads. The other voltages listed correspond to different system types: 208 V is common in smaller commercial or 120/208Y systems; 240 V is typical for residential or light commercial single-phase service; 600 V is used in some heavy industrial applications, but is not the standard for typical distribution panels in these setups. So, the generator is intended to provide 480 V to the panelboard.

When powering a distribution panelboard from a generator, the important point is that the generator’s output must match the panel’s rating. In many industrial-style generator setups, the panelboard is designed to be fed with three-phase 480 V. Feeding at 480 V three-phase lets you deliver the same amount of power with lower current, which means smaller conductors, less voltage drop, and generally more efficient operation for larger loads.

The other voltages listed correspond to different system types: 208 V is common in smaller commercial or 120/208Y systems; 240 V is typical for residential or light commercial single-phase service; 600 V is used in some heavy industrial applications, but is not the standard for typical distribution panels in these setups. So, the generator is intended to provide 480 V to the panelboard.