What’s knob and tube wiring?
It’s among the earliest methods of electrical wiring in buildings and was a typical system of pipes in North America in the 1880’s to the 1930’s. This wiring system uses knobs that help maintain aluminum wires which are coated by ceramic tubes which operate through the joist and stud drill-holes. The true cable is made up of just a hot (black) and neutral (white) cable with no ground cable. Both wires need to run independently to fittings instead of those used now that are included inside a plastic sheathing.
Is it secure?
It’s secure but the drawback of the wiring process is that it’s too obsolete to be utilized in today’s home particularly with all of the heavy duty electrical appliances we use nowadays. Actually many insurance companies aren’t inclined to cover homes which have present knob & tube wiring, or can do this only at a much greater rate. The knob and tube wiring may have a couple problems under certain conditions. The insulating material used in quite brittle and can not withstand high temperatures such as modern wiring. If the knob and tube wiring was used inappropriately it can cause the insulation to break exiting the cable exposed.
Improper splicing may be a hazardous problem too notably because splicing to the knob and tube wiring isn’t a very simple procedure. The other problem with this specific wiring process is the fact that it isn’t a grounded system. This implies it can’t be used to cable modern electrical outlets but just for ungrounded applications.