Knob & Tube wiring

[powerplay]

I have a stairwell that needs a three way switch at top of stairs. I discovered the bottom switch is being fed from knob & tube wiring. To strap wire on the surface, I was going to use armoured cable, but now amthinking i need to tape it where it enters the wall close to other wires. No cantact will be made, but an extra precaution. The trick I think is the existing knob and tube has no ground/bond... do i use the armoured cable and strap it to the box? ...maybe use building wire?...shielded where it may get mechanical damage? Thanks in advance for your feedback.

 

[LEO2854]

I have a stairwell that needs a three way switch at top of stairs. I discovered the bottom switch is being fed from knob & tube wiring. To strap wire on the surface, I was going to use armoured cable, but now amthinking i need to tape it where it enters the wall close to other wires. No cantact will be made, but an extra precaution. The trick I think is the existing knob and tube has no ground/bond... do i use the armoured cable and strap it to the box? ...maybe use building wire?...shielded where it may get mechanical damage? Thanks in advance for your feedback.

Why would you want to use armored cable coming out of a metal box that has no EGC?:blink:

 

[powerplay]

Why would you want to use armored cable coming out of a metal box that has no EGC?:blink:

The place has every form of wiring known to man... I didn't know it was knob and tube until I tackled it, but wanted to protect the conductors when they were in a stairwell below 1.5 meters. I stopped when i seen the knob & tube, and thinking I should go with plastic wire mold perhaps. The screws that hold the cover plate still are connected to the box with no EGC...

 

[bobbymari]

nylon or plastic screws are an option i know they come in 632 and 832 sizes to secure ur plastic w/mold boxes to existing metal boxes

 

[LEO2854]

The place has every form of wiring known to man... I didn't know it was knob and tube until I tackled it, but wanted to protect the conductors when they were in a stairwell below 1.5 meters. I stopped when i seen the knob & tube, and thinking I should go with plastic wire mold perhaps. The screws that hold the cover plate still are connected to the box with no EGC...

I think the wire mold will work well.

 

[mjf]

I have a stairwell that needs a three way switch at top of stairs. I discovered the bottom switch is being fed from knob & tube wiring. To strap wire on the surface, I was going to use armoured cable, but now amthinking i need to tape it where it enters the wall close to other wires. No cantact will be made, but an extra precaution. The trick I think is the existing knob and tube has no ground/bond... do i use the armoured cable and strap it to the box? ...maybe use building wire?...shielded where it may get mechanical damage? Thanks in advance for your feedback.

Just curious, what is "building wire"?

 

[powerplay]

Just curious, what is "building wire"?

I was referring to cable that is permitted to be pulled into wood stud in residential applications, yet also allowed to be surface strapped if 1.5 meters off floor and not subjected to mechanical damage.