For questions about Knob and Tube electrical wiring throughout the home. Sometimes abbreviated as K&T.

learn more… | top users | synonyms

0
votes
1answer
51 views

Does MA require permit to replace old K&T and if no how do I know if work is done to code?

Is it required to pull a permit in MA to replace knob and tube wiring? If no, how can one determine if the work done adheres the the proper codes? Who should be sought after to confirm this if no ...
0
votes
1answer
42 views

Why must all outlets share a ground conduit?

I was reading this answer in my quest to see how possible adding grounds to my existing knob and tube house would be, and was suprised by: Are you asking if it's OK to run a separate ground wire ...
1
vote
2answers
98 views

Are the old A-head terminals for connecting to knob and tube wiring still compliant?

I'm in the process of decommissioning the last active (hopefully) knob and tube circuit in my house (I'm in the U.S.). The problem is that about 90% of the lighting in the house is on this circuit, ...
3
votes
1answer
83 views

How to minimize wall tearing when installing new wiring?

We have bought a new house with knob and tube wiring. We are now looking into replacing all of it with new wiring and understand that significant wall-surgery will be required to run the conduits. ...
4
votes
3answers
115 views

Why are ungrounded GFCIs required to be labeled?

I discovered in my new house that someone had incorrectly connected grounded outlets (without any ground connected) to the knob and tube wiring. I have read that the outlets can be made safe by ...
2
votes
2answers
253 views

Box in knob and tube wiring between ceiling and cellulose?

I know that code says no cellulose insulation with knob and tube wiring because of possible heat build up. I also know that evidence of it causing fires because of this is scarce and a few states ...
3
votes
1answer
70 views

what causes a ceiling fan light to blink

I dropped a new romex line down through the wall to provide power to a flat panel tv mounted on the wall. The wall has K&T wiring in it. Everything seemed fine, until I noticed that the lights in ...
1
vote
1answer
129 views

Running conduit near knob and tube wiring

I have some new AC ducts in our new house that will soon be concealed behind new drywall, but before the drywall goes up, I wanted to run some conduit from the upper floor down to the basement for ...
3
votes
2answers
3k views

Is it safe to put insulation next to knob & tube wiring?

I have a room that has some really ugly cheap panelling on the walls. I want to rip it out & replace with drywall. While I'm at it, I'd like to add soundproofing insulation between rooms & ...
1
vote
1answer
192 views

Integrating into knob-and-tube wiring: okay to borrow a ground [duplicate]

I have a mixture of knob-and-tube and NM-B. If I'm extending from knob and tube, but I have a (different) an NM-B circuit nearby, is it technically allowable to ground via ground wire in the other ...
5
votes
4answers
7k views

Should I use a GFCI or AFCI circuit breaker with knob and tube wiring?

My American house was built in 1942, and much of the wiring is still knob-and-tube wiring (2-wire, no ground). Over the years new modern wiring has been added to the house, but we still have some KnT ...
3
votes
1answer
543 views

Can a Knob & Tube live hot wire be left disconnected without the neutral in a switch box?

Can a live (capped) knob & tube hot wire be left disconnected, without the neutral (it's removed) in a new switch box now fed by a modern 20amp circuit and romex? The reason it is still live is ...
3
votes
4answers
19k views

How can I attach modern fixture to knob & tube wiring?

I have a modern external light fixture that needs to be attached to an existing exterior electrical 'box'. The older parts of the house have knob & tube wiring and there is evidence of gas ...
10
votes
2answers
4k views

Can disconnected knob-and-tube wiring be left in place?

The house I recently bought (over 100 years old) has had almost all of its wiring replaced with a new elctrical board. However, in two cases the new wiring has been connected to existing knob-and-tube ...
3
votes
1answer
3k views

How to determine what 3-way switch system was used?

How can I tell if an old Knob & Tube 3-way switch is still legal by the modern NEC? Specifically I am trying to tell if my switch is a "California 3-way" (or "Coast 3-way", "Hollywood 3-way", etc....
5
votes
2answers
2k views

I am removing some Knob and Tube wiring. Can I leave the NEUTRAL wires hanging in the walls?

I am renovating my bathroom. I am bringing in new circuits for all the electrical, and replacing the boxes. I will have no problem capping off/removing the live (black) knob and tube wires in boxes. ...
7
votes
4answers
10k views

Can I replace an outlet that uses knob and tube wiring with a grounded outlet?

Can I replace an outlet that uses knob and tube wiring with a grounded outlet? Obviously the best choice would be to replace the old wiring. Is there a standard way to ground these outlets? Do I need ...
12
votes
3answers
1k views

What is “knob and tube wiring”?

I assume this is some USA wiring system, am I right?
33
votes
9answers
30k views

Should old knob and tube wiring be replaced?

I have been doing some electrical work in my house and I noticed it has old knob and tube wiring that is still hot, should this be replaced as found or is it fine to just leave it? It seems really ...