What are the two most common causes of electrical troubles?

The two most common causes of electrical troubles are often linked to careless maintenance and adverse weather conditions. Careless maintenance can lead to issues like corroded connections, frayed wires, and improperly secured components, all of which can disrupt electrical systems. Similarly, weather conditions such as humidity, temperature extremes, or exposure to moisture can adversely affect electrical components, leading to failures that might not occur in more controlled environments.

While the other options touch on valid concerns within electrical systems, they do not represent the most prevalent causes. Issues like poor design or outdated components might contribute to overall system failure but are less about immediate electrical troubles. Negligent handling and faulty equipment can also lead to problems, but these situations often arise from a lack of proper procedures during maintenance rather than being a prevalent cause on their own. Lastly, inexperienced technicians and complex wiring can pose challenges, yet these factors are typically more about how issues arise rather than the specific causes of electrical troubles.