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bronco2 10-02-2009 07:11 AM

Knob and Tube wiring.
I am not sure if this is actually what they call this type of wiring or not but that is what I call it. It is the wire that they used a long time ago that the positive and the ground were 2 seperate wires, each in there own sheath of some kind. This wiring is supposedly not good stuff because it overloads and can cause fires. Well my problem is, this stuff is the power supply for the entire upstairs of a friends house that we are reroofing. My question to any of you out there is how hard is this wiring to change out to Lumex and does anybody know the best way to get the old wiring out of the walls and the new wiring down an exterior wall to the elecrical panel in the basement.

joed 10-02-2009 07:44 AM

Once the old wiring is replaced and de-energized it can be left in the walls.
How difficult the change is depends on the house. You need to get cables from the breaker box to the area in question. With an open attic the cables can all be fished down from above. But how hard s it to get from the panel to the attic. For ground floor cables can fished fromthe basement below very easily if the basement has an open ceiling.

hohadcr 10-02-2009 08:27 AM

Basically, it is like wiring the place from scratch. Good planning will help save time and trouble.

Scuba_Dave 10-02-2009 08:42 AM

You may be able to use the holes that the K&T are in
You can abondon the wire as said in the wall
It has to be all disconnected to do so
K&T can branch off in different directions, so be aware of that
Disconnecting one area may lead to lots of items not working

If there is a lot & you don't want to risk shutting it all off at once; then run the new stuff 1st & only disconnect the old when ready

Be careful of fishing wires in walls with existing K&T
You don't want to damage it while it's in use

Gary_602z 10-02-2009 06:48 PM

Would it be possible (with the power off) to pull the romex back up with the K&T wire?


300zx 10-02-2009 07:26 PM

From the K&t I have seen with the walls torn open I would say no.I have rewired 2 house that had K&T And the way it was in the wall i would say no .But thats with the two I have rewired. The wires went from on side to the other with insulators Like zigzag.Alo alot of the K&t was spliced in the wall going diferent directions.

Jim Port 10-02-2009 08:02 PM

The holes drilled for K&T are smaller than you would typically drill for new wiring and they probably do not line up very well either.

bronco2 10-03-2009 09:57 AM

Thanks guys for the advice. A buddy of mine who's an electrician came over yesterday and we got most of the K&Tfished through the walls there are a couple of wires we cannot find though that go from receptacles to something. Any ideas. And it doesnt work all that well to tie onto the old K&T with the new wire. Out of probably 8 attemps 1 worked and it was only a 5' pull.

joed 10-03-2009 12:36 PM

It depends. I lucked out once and the cable feeding the K&T in the second floor was not fastened in the walls. I was able to pull new cables up from the basement to the second floor using the old cables. As soon as you have access to the cables you will know. Tug on them and see if they come up. The individual wire will not be able to be used. They will be fasten for sure to the studs or past through tubes which will be too small for NM cable.

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