Updating knob and tube wiring updating fstab
When we come across this we automatically add receptacles where is needed.Even though, we are only required to replace and rewire what is existing and it will simply pass the ESA inspection, such as a bedroom that only has one receptacle instead of having 3 or 4 receptacles.When the wires were pulled into a wall or enterd a wiring device such as a lamp or switch the wire was further protected with a loom which is a flexible insulating sleeve.The earliest looms would be an asphalt saturated cotton cloth which was then later replaced with rubber.Do I have even the slightest idea of what I'm trying to ask?If you need a receptacle that can accept a grounded plug but don't actually have a need for grounding, you have two options: (1) a GFCI-type receptacle marked with the words “No equipment ground,” and (2) a three-prong outlet protected by an upstream GFCI and marked with the words “GFCI protected” and “No equipment ground”.
The reason for this was the realtively low cost of wiring a home using knob and tube over running steel jacketed conduit wiring. When the wire had to run through studs or joists, and insulating ceramic tube kept the hot wire away from the wood as well as protected the wire from possible damage if the house shifted.
See section 210-7(d)(3) of the National Electrical Code.
If you actually need grounding, I'm afraid there are no shortcuts: you will have to rewire.
Knob and tube wiring was installed in houses in North America in the early 1900s to 1940s.
This system consists of two wires, one black or hot wire and the other white or neutral to create a circuit. These two single wires are held in place with ceramic knobs and tubes.