Which condition can lead to a successful operation of overcurrent devices?

Proper selection based on load characteristics is crucial for ensuring the effective operation of overcurrent devices. When the protective devices, such as circuit breakers or fuses, are selected based on the specific characteristics of the load they are intended to protect, they can react appropriately during overcurrent conditions. This means they will trip or blow at the correct time to prevent damage to the conductors and connected equipment, while also avoiding nuisance tripping.

When the characteristics of the load, including its normal operating current, inrush current, and potential fault currents, are taken into account, the selected overcurrent protection device will be capable of handling the operational conditions without compromising safety or functionality. This tailored approach ensures that the devices operate as intended, enhancing the overall safety and reliability of the electrical system.

In contrast, incorrectly sizing or randomly selecting protective devices can lead to inadequate protection or unnecessary interruptions in service. Using only fuses limits flexibility and may not address various load types effectively, thereby lacking the adaptability that properly selected devices provide.