Is Knob and Tube Wiring Dangerous?
Knob and tube wiring systems were commonly used in houses from the 1880s through the 1940s. As they’re often kept out of sight, many people overlook the dangers of these obsolete electrical systems. They lack many elements modern appliances require, putting extra strain on the electrical infrastructure and increasing the chances of accidents.
There are many other risks associated with knob and tube wiring. Here are the main ones:
No grounding
Knob and tube systems only feature two wires: a neutral and a hot wire. There isn’t a grounding element that would safeguard against electrical surges. As a result, there’s a higher risk of damaging the connected appliances and injuring the inhabitants if such a surge were to occur.
Compounding damage
Knob and tube wiring is wrapped in a rubber cloth. Over time, the rubber sheath becomes brittle and cracks. As a result, the sheath can fall off and leave wires exposed, which creates a fire or shock hazard. Exposure to animal damage can further compound the exposure issue.
Unsuitable for building changes
This outdated system is meant to stay in the air supported by ceramic tubes. However, some home improvement projects can disrupt the structure:
Added insulation – Extra insulation in wall cavities and the attic can overheat knob and tube wiring. This electrical system is designed to stay in the open air that keeps them cool. Covered wires may also be damaged by people who unknowingly walk on top of them in the attic.
Faulty connections – In many cases, knob and tube wiring can be an easily accessible system. Therefore, homeowners believe they’re capable of altering the wires on their own. In turn, they make incorrect splices and connections, greatly compromising safety. These extensions and modifications are also prohibited by most electrical and building codes.
Unfit for moist environments
Knob and tube wires should never be used in moist environments. It can be extremely dangerous to have them in wet areas, including the outdoors, utility and laundry rooms, bathrooms, and kitchens.
Is there a way to ensure knob and tube wiring is safe?
While knob and tube wiring is more dangerous than modern electrical systems, it can function without safety risks. Here’s how to ensure it’s problem-free:
Schedule professional inspections
Reach out to a seasoned technician and have them verify the system’s condition. They’ll assess the wiring, receptacles, connections, switches, fuses, and all other components to help prevent any issues.
Replace improper circuits
Damaged, covered, and incorrectly modified circuits should be replaced with modern grounded circuits. They help fend off fires and shock hazards.
Add protection
Many elements can enhance the safety of knob and tube wires. The most effective installments include a ground-fault circuit interrupter (GFCI) and arc-fault protection interrupter (AFCI).
While GFCIs can be ungrounded, they can still detect excess energy flow and cut the power to outlets to prevent electric shocks. On the other hand, AFCIs can stave off house fires brought about by loose wiring connections.
When in doubt about the best course of action, contact a local professional electrician to guide you.
When you need a licensed electrician for commercial or residential electrical needs, call Zimmerman Electric at 310-378-1323.