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Knob and tube wiring is a notable safety hazard commonly found in older homes. This type of wiring was widely used from the late 1800s until the 1940s but has significant safety concerns today. One of the primary issues with knob and tube wiring is that it lacks a ground wire, which is crucial for safely grounding electrical circuits, increasing the risk of electrical shock or fire. Additionally, the insulation on these wires can degrade over time, leading to potential exposure of the wiring and creating further hazards.

In contrast, ground fault circuit interrupters (GFCIs) are installed to minimize the risk of electric shock by shutting off power in case of a fault; these are not generally a hazard but rather a safety feature. Overhead lighting fixtures typically do not pose a safety hazard unless improperly installed or maintained, and smart home devices are modern innovations designed to improve safety and convenience, rather than being a hazard. Therefore, the presence of knob and tube wiring in older homes illustrates a significant safety concern related to outdated electrical systems.