09:09AM | 11/13/02
Member Since: 11/12/02
3 lifetime posts
I have an older three-story home that was wired with knob and tube. The first two floors have been rewired. The third, which has been used just for storage for at least 30 years, still has the knob and tube. I would like to do a little remodeling on that floor. How can I connect sheathed electrical cable to the knob and tube? Do I just use a junction box and connect hot to hot and neutral to neutral? I plan to wire it for no more than lamps and outlets that wouldn't draw much juice. Can I run a small window air conditioner on a circuit like this? Thanks in advance!


Electrical Inspector

12:13AM | 11/14/02
Member Since: 09/27/02
76 lifetime posts
Steve, there is really no good way to extend old K&T to newer wiring methods, i.e.-sheathed electrical cable.

the fact that K&T lacks a grounding conductor (bare) is one factor that is hard to overcome.

it is best that you figure a way to install some newer wiring back toyour panelbox during any renovation here vs. utilizing ( and buring..) the older K&T


03:18AM | 11/14/02
Member Since: 09/17/02
524 lifetime posts
I ahd a knob tube house that had 2 conductor sheathed electrical cable style cable running down from the 2nd floor to the basement for the power. It turned out this wire was fished and not attached anywhere in the wall. I used it as fish to pull in new nm cable.


06:58AM | 11/15/02
Member Since: 11/12/02
3 lifetime posts
Thanks for the good info, Inspector. I have a followup question. There is an unused 220/240 slot in the fuse box. Can I use that to connect 110/120? Thanks in advance.

Electrical Inspector

12:50PM | 11/15/02
Member Since: 09/27/02
76 lifetime posts
....ok you have either an unused 'slot' for a breaker, or the breaker itself is unused.

In any event, one 'slot' should hold one breaker, and one breaker in 99.9% of American residences would give you 120 volts.


03:12PM | 11/15/02
Member Since: 11/12/02
3 lifetime posts
I did the smart thing and got a professional electrician to look at the situation. I'm good to add two new circuits to the box, which gives me grounded service throughout the third floor. I really appreciate the advice. It helped a lot!


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