Which of the following is a common cause of electrical faults?

A common cause of electrical faults includes both excessive twisting of wires and improper grounding. Excessive twisting of wires can lead to poor connections and increased resistance, which may generate heat and create the risk of arcing or even fire. These issues disrupt the flow of electricity and can cause a malfunction in the electrical system.

Improper grounding is crucial when it comes to electrical safety, as it ensures that any stray voltage or fault current is safely directed to the ground. If grounding is inadequate or incorrect, it can lead to increased risk of electrical shocks, equipment damage, and electrical fires.

Thus, both excessive twisting of wires and improper grounding contribute significantly to the likelihood of electrical faults, making the choice encompassing both factors correct in this context. Understanding these causes is essential for maintaining safety and reliability in electrical systems.