Which of the following can lead to an overcurrent condition?

Exceeding the designed load of the circuit is a fundamental cause of an overcurrent condition. Every electrical circuit has a specified capacity, often defined by the size of the conductors and the ratings of the protective devices used, such as circuit breakers or fuses. When the current flowing through the circuit exceeds this capacity, it creates an overcurrent scenario. This can be due to added electrical devices or equipment that draw more power than the circuit can support, potentially leading to overheating, equipment damage, or even electrical fires.

Understanding circuit load capacity and ensuring that the total load does not exceed this limit is crucial for maintaining safe electrical systems. This concept underscores the importance of proper load calculations during electrical design and installation to prevent overcurrent conditions that could compromise safety and functionality.