What is the maximum voltage drop permissible for a 440-volt circuit at 60 amperes?

To determine the maximum permissible voltage drop in a 440-volt circuit at a current of 60 amperes, we can apply the guideline commonly used in electrical installations, which typically suggests that the maximum allowable voltage drop should not exceed a certain percentage of the circuit voltage to ensure efficient operation of electrical equipment.

For general installations, a common standard allows for a maximum voltage drop of 3% for branch circuits. In the case of a 440-volt circuit, the calculation for 3% of the system voltage would be:

0.03 x 440 volts = 13.2 volts.

This calculation suggests that a voltage drop exceeding 13.2 volts could result in inefficiencies and possible operational issues for connected devices. Hence, the correct option reflects this standard by providing a maximum value of 13.2 volts, illustrating that this is the point at which performance may start to diminish due to excessive voltage drop.

The understanding of this concept is crucial in electrical design as it helps in selecting appropriate wire sizes and lengths to minimize voltage drop, thereby ensuring that devices receive adequate voltage for proper functioning.