When two or more power production sources are operating in parallel with a primary source of electricity they shall have compatible ___.

When two or more power production sources are operating in parallel with a primary source of electricity they shall have compatible ___.

• A. Frequency ratings
• B. Voltage
• C. Wave shape
• D. All of these

Answer: (D)

When multiple power sources operate in parallel with a primary source, their outputs must behave like a single, coordinated source. If the frequency isn’t the same, the sources drift in and out of step, creating circulating power and instability. If the voltages differ, currents push from the higher to the lower source instead of to the load, causing unwanted heating and potential damage. If the wave shapes aren’t compatible, the combined output becomes distorted, harmonics rise, and protection or equipment can trip or fail. Because all these factors—frequency, voltage, and waveform—need to match for safe, stable parallel operation, the best answer is that all of these must be compatible.

When multiple power sources operate in parallel with a primary source, their outputs must behave like a single, coordinated source. If the frequency isn’t the same, the sources drift in and out of step, creating circulating power and instability. If the voltages differ, currents push from the higher to the lower source instead of to the load, causing unwanted heating and potential damage. If the wave shapes aren’t compatible, the combined output becomes distorted, harmonics rise, and protection or equipment can trip or fail. Because all these factors—frequency, voltage, and waveform—need to match for safe, stable parallel operation, the best answer is that all of these must be compatible.