Abandon knob tube in wall?

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  #1  
Old 09-26-18, 05:15 PM
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Abandon knob tube in wall?

Can I abandon k&t in the wall?
I'm rewiring an old lighting circuit and want to ride everything with nmd.

Secondly, I have a junction box with dinner - 2 black kt wires. It controls a light which has nmd black and red in the junction box. I cannot find any other box with splices. Does this mean I have an open splice somewhere?
Thirdly, kt doesn't seem to travel like a live and neutral. I have one wire coming into the box and one leaving bit they go in totally different directions.
 
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  #2  
Old 09-27-18, 09:07 AM
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Technically the wire ends must be in boxes unless the wire section is absolutley positively known to be orphaned in which case the wires may be snipped off as far as you can reach and what is left is abandoned in the wall.

Two unconnected ends do not prove being orphaned because knob and tube wiring can have splices hidden in a wall.

It is also quite common for K&T to include hot and neutral going off in different directions.
 
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Old 09-27-18, 10:58 AM
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Since you are rewiring, do not keep any of knob and tube wiring. Disconnect all knob and tube wiring and run new cable as needed.
Then, you can abandon wiring in the wall.
 
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Old 09-27-18, 11:55 AM
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My main question was the junction box with dimmer has 2 KT wires. The light it controls has modern NMD.
Does that mean an open splice in the wall or ceiling?
I would have expected to see a KT wire in the light junction box as well.
 
  #5  
Old 09-27-18, 03:14 PM
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Does that mean an open splice in the wall or ceiling?
If you cannot find a splice point, most likely.
You are better off just running new cable all the way.
 
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Old 09-29-18, 07:27 PM
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Most likely you have a hidden splice. Sometimes the last foot of K&T is cut off and replaced with NM-B so newer fixtures can be installed (90 degree wiring). Of course it's not allowed, but people do it anyway.

I would try to replace the whole K&T circuit. It's really hard to replace only part of a circuit as the wires tend to branch out in all sorts of odd directions.
 
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