International Compliance Association (ICA) Home Inspector Practice Exam

Which statement regarding knob-and-tube wiring is true?

1. It has inherent safety risks

2. It is only allowed in new homes

3. It has no inherent safety risks

4. It is always permissible

The correct answer is: It has no inherent safety risks

Knob-and-tube wiring is a type of electrical wiring system that was commonly used in homes built in the late 19th and early 20th centuries. The correct statement is that knob-and-tube wiring has inherent safety risks. One of the main safety concerns with knob-and-tube wiring is that it lacks a ground wire, which is essential in modern electrical systems for safely redirecting excess electrical current. Additionally, the wires can deteriorate over time, leading to insulation breakdown and potential fire hazards. Knob-and-tube systems are also often overloaded when modern appliances with higher electricity demands are connected, exacerbating safety risks. This understanding is crucial for home inspectors as they need to assess electrical systems and identify potential dangers within homes that still have this type of wiring. Proper knowledge of the inherent risks allows inspectors to inform homeowners and potential buyers about necessary upgrades or safety measures.