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Risks of Knob and Tube Wiring

What’s Knob and Tube Wiring?
knob and tube wiring was among the most hazardous wiring procedures ever used since it’s an ungrounded system. What does this mean? Electricity starts in the circuit breaker in which it moves through the hot or “ungrounded” conductor and comes down to the neutral or “grounded” conductor completing its own path. This system works well in theory until you turn into a path to earth.


Lately, another way to ground is necessary by either using the outer metallic sheathing of cable or conduit or simply by putting a genuine floor or “grounding” conductor inside the cable gathering. This offers an alternate route to earth tripping the circuit breaker disallowing YOU to develop into that route.

This may not seem very probable, but it’s really not tough to achieve. If you’re in your basement and pull on the pull string of an ungrounded light fixture, then it is simple to become the path to ground. The exact same can occur with almost any ungrounded light switch or receptacle.

The National Electrical Code permits ungrounded receptacles to be two-pronged rather than three-pronged. The reason that the code permits this is due to the fact that the lack of a third prong or “grounding” prong is supposed to prevent individuals from plugging in equipment that has to be grounded but rather most people dismiss the grounding prong of an extension cable or power tool which makes it incredibly dangerous.

Another way this might be fixed is by installing a ground fault receptacle, which measures the present going through the plug itself and will trip if there’s an unbalanced present, protecting the end user. Even though this is the more powerful “quick fix”, the possible homeowner remains left with a knob and tube wiring.

Some could believe that they’re secure since they’ve installed GFCI receptacles yet another problem is different. When knob and tube circuits operate, they’d pull a neutral cable from whatever circuit was nearest. This signifies is that there’s a plethora of present metering the neutral conductor which isn’t attached into a circuit breaker permitting that conductor to overheat rather than open the circuit.

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