To keep the voltage drop of a 277V circuit to a maximum of 3%, what is the maximum allowable voltage drop?

• A. 4.2V
• B. 5.5V
• C. 8.3V
• D. 7.1V

Answer: (C)

To determine the maximum allowable voltage drop for a 277V circuit while adhering to a maximum voltage drop of 3%, you can calculate the permissible drop by using the formula:

Maximum Voltage Drop = Voltage x Percentage Drop

In this case, the voltage is 277V, and the percentage drop is 3% (or 0.03). Thus, the calculation would be:

Maximum Voltage Drop = 277V x 0.03 = 8.31V

Rounding this to one decimal place gives you 8.3V. This indicates that the maximum allowable voltage drop in the circuit to maintain efficiency and equipment performance is 8.3V.

This option aligns correctly with the calculation, making it the right choice as it precisely adheres to the specified limitation of a 3% voltage drop on the 277V circuit.