What will happen if the generator's voltage is incompatible with the electrical service?

What will happen if the generator's voltage is incompatible with the electrical service?

• A. Equipment will burn up or operate incorrectly
• B. The service will automatically compensate for the mismatch
• C. The entire facility will shut down without damage
• D. Circuit breakers will trip without any damage

Answer: (A)

When a generator is not supplying the same voltage as the electrical service, equipment connected to both can see voltages outside what they’re built to handle. That overvoltage or undervoltage can cause insulation breakdown, overheating, and improper operation of motors and electronics. If the generator and the service aren’t in proper phase and voltage alignment, circulating currents can flow and stress equipment, increasing the risk of damage or fire. That’s why the scenario described best matches “equipment will burn up or operate incorrectly.” Automatic compensation or perfect protection isn’t guaranteed. In practice, a mismatch isn’t something to rely on being corrected by the system itself, and while protective devices may trip to prevent damage, some damage can still occur before they act. A total shutdown with no damage or breakers tripping “without any damage” aren’t dependable outcomes.

When a generator is not supplying the same voltage as the electrical service, equipment connected to both can see voltages outside what they’re built to handle. That overvoltage or undervoltage can cause insulation breakdown, overheating, and improper operation of motors and electronics. If the generator and the service aren’t in proper phase and voltage alignment, circulating currents can flow and stress equipment, increasing the risk of damage or fire. That’s why the scenario described best matches “equipment will burn up or operate incorrectly.”

Automatic compensation or perfect protection isn’t guaranteed. In practice, a mismatch isn’t something to rely on being corrected by the system itself, and while protective devices may trip to prevent damage, some damage can still occur before they act. A total shutdown with no damage or breakers tripping “without any damage” aren’t dependable outcomes.