Which of the following is a common cause of fire incidents?

Faulty electrical wiring is a common cause of fire incidents because it can lead to overheating, short circuits, and arcing, which all pose significant fire risks. When electrical systems are not installed correctly, or when wires become damaged over time, they can easily ignite nearby materials if they are exposed to high temperatures or if too much current flows through them. This issue is prevalent in both residential and commercial buildings, as older properties may have outdated wiring, or renovations may introduce improper installations.

The other options do not typically lead to fire incidents as directly or frequently. Excessive ventilation can sometimes disrupt fire behavior in certain circumstances, while improper insulation may lead to energy inefficiencies but is less directly connected to fire ignition than faulty wiring. Frequent building maintenance generally aims to prevent hazards and ensure safety, thus reducing the risk of incidents rather than increasing it.