Aluminum Wiring From the mid 60’s to the late 70’s, aluminum wire often replaced copper as a cheaper alternative. But, aluminum’s properties proved problematic for reasons no one had anticipated.
With aluminum wiring it is possible that, over time, a high resistance connection and/or arcing can develop somewhere in the electrical system, resulting in a connection that gets very hot. This increased risk of fire.
Fortunately, the problems associated with aluminum wiring are now well understood, thus shifting the focus to making installation safe. A knowledge able electrician with aluminum wiring experience can check for safety and make necessary corrections.
Courtesy of Steve Sipos, Pillar to Post Home Inspections
Knob and Tube Wiring
Knob and tube wiring, commonly found in home over 50 years of age, consists of parallel hot (black) and neutral (white) wires, separated by knobs ( or insulators) and ceramic tubes. It is considered a higher risk than contemporary wiring installations mainly because there is no ground wire.
Given their age, wires are highly susceptible to wear and exposure, presenting a serious safety hazard. The unintentional contract of hot and neutral wires may potentially cause an electrical fire.
As a result, your insurance company may rewire that you replace all exposed knob and tube wiring with approved permanent wiring material before they will provide converge. Updating wiring can cost thousands of dollars.
Get a proper estimate by a licensed electrician before confirming an offer on a property, and remember to budget for costs for cosmetic repairs to drywall.
Courtesy of Henry Heczko-Equity homes Niagara.