Knob and tube wiring may still be acceptable if it is not?

Knob and tube wiring may still be considered acceptable if it is not covered by insulation. This type of wiring, which originated in the late 19th century and was common until the 1940s, has specific safety concerns primarily due to its design. One of the significant risks associated with knob and tube wiring is overheating, which can occur when wires are insulated improperly.

When knob and tube wiring is covered with insulation, it can trap heat and lead to electrical fires or damage over time. Therefore, if the wiring is not covered by insulation, it allows for proper airflow around the wires, reducing the risk of overheating and making it safer in terms of electrical hazards. This straightforward safety consideration makes the absence of insulation a key factor in assessing the continued acceptability of knob and tube wiring in homes, especially during inspections.