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

0 votes
1 answer
609 views

How to identify a fixture/outlet and wiring to breaker as knob and tube?

I have spent time charting out all the lights, outlets, etc. in our house and what breaker they are each on. I know that most of the original part of our house in knob and tube and the early 90's add …
user20127's user avatar
  • 1,241
0 votes
3 answers
6k views

Test outlets to see if knob and tube? (grounded?)

Considering a rewire in the future and want to figure out which outlets (and ideally fixtures) are knob and tube. I know many are, some are not. Probably all 2 prong outlets are k&t, possible some 3 p …
user20127's user avatar
  • 1,241
5 votes
5 answers
5k 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 allo …
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  • 1,241
2 votes
3 answers
285 views

Why does Knob and Tube need an air gap?

I know that knob and tube wiring needs an air gap to dissipate heat. I know that modern sheathed cable does not need an air gap. I know both are made of copper, one is grounded, one not. So why does …
user20127's user avatar
  • 1,241