What is the purpose of performing fault-current calculations?

The purpose of performing fault-current calculations is primarily to enhance personnel safety. These calculations help in understanding the maximum current that can flow through a system during a fault condition, which is critical for designing safety measures and protective devices. By knowing the potential fault current levels, engineers can choose appropriate circuit breakers, fuses, and other protective equipment that will operate correctly to isolate the fault and protect both the personnel and equipment.

Understanding fault currents is essential for ensuring that the protective devices will trip under fault conditions and help prevent injury to personnel and damage to equipment. This safety aspect is crucial, particularly in settings where electrical systems are heavily utilized, as it helps create safer working environments and reduces the risk of electrical accidents.

The other options may relate to operational efficiency or reliability but do not directly address the fundamental goal of fault-current calculations, which is to ensure safety in electrical installations.