Knob and Tube Wiring

Before insulating or working in an attic, it is important to know what type of electrical service you have. Knob and tube wiring exists in many homes, for this was the type of electrical service used in homes built between 1880 and 1930. It was fine for the times, but higher technology resulted in additional stressed (and hazardous) loads.

Knob and tubes' disadvantages are that there is no ground wire, limited surge capabilities and brittleness over time. Homes with this type of wiring should be update prior to insulating or protected in advance. HZG ALWAYS recommends having the wiring checked prior to insulating.

With the advent of breakers, the fuse box went away. Unfortunately, so should of the knob and tube...