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Do you live in a home or commercial building that was built in the 1900’s to the early 1950’s?
If so, then your building is almost sure to have what is called “knob and tube” wiring or an ungrounded system. Here are the top 5 dangers of knob and tube wiring.
Older houses often have what is called ‘knob and tube’ wiring.
This wiring is considered dangerous by most insurance companies today, making it hard to insure homes and buildings that incorporate it.
Aluminum wire in power transmission and distribution applications is still the preferred material today.
In North American residential construction, aluminum wire was used for wiring entire houses for a short time from the 1960s to the mid-1970s during a period of high copper prices.
The connection heats up and cools down, slowly working its way loose and further degrading the connection.
As an inspector I have seen many residential wiring errors and problems caused by older or improperly designed or installed electrical systems.Shocks and fires can easily result from faults caused by knob and tube wiring.2) Knob and tube wiring uses sheathing for insulation and both of these disintegrate easily over time.From the service entrance the power runs through a bus and into individual circuit breakers, then through the individual circuit wiring to the outlets, lights, switches, etc.I am going to describe the common types of wiring currently found in residential and light commercial buildings and the problems that can be associated with each type of wiring.
Utility companies have used aluminum wire for electrical transmission in power grids since around the late 1800s to the early 1900s.