What is a common issue that may arise with knob-and-tube wiring?

Knob-and-tube wiring, an early method of electrical wiring used in homes, has specific characteristics that can lead to common issues. One of the significant problems is overheating due to the lack of insulation. This type of wiring relies on air circulation for cooling, and when it is placed in areas where insulation is added, it can overheat because the insulation traps heat around the wires.

Additionally, knob-and-tube wiring may not be compatible with modern appliances, as today's electrical devices often require more power than these older systems can safely handle. This incompatibility may result in overloaded circuits, which can create fire hazards or damage to appliances.

Both overheating from lack of insulation and issues related to compatibility with modern appliances contribute to the risks associated with knob-and-tube wiring. Thus, recognizing both of these concerns illustrates the importance of assessing older wiring systems in homes, particularly when renovations or upgrades are considered.