Knob & Tube wiring - when did it stop?
 

I installed knob and tube in the Cleveland area in the early 1960s. We started to add a green ground and that's what finally killed it. the cost increased by a third because of the ground and local jurisdictions also argued over the best way to splice the ground. Some allowed soldering while other insisted on a crimped connection.

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For full context, visit https://www.homeownershub.com/mainte...op-291758-.htm

Knob & Tube wiring - when did it stop?
 

On Thu, 10 Jun 2021 21:32:31 +0000, bob lang
wrote:

I installed knob and tube in the Cleveland area in the early 1960s.
We started to add a green ground and that's what finally killed it.
the cost increased by a third because of the ground and local jurisdictions
also argued over the best way to splice the ground.
Some allowed soldering while other insisted on a crimped connection.


New install - legal and inspected - of K&T in the 1960's ?
OK if you say so ..
John T.

Knob & Tube wiring - when did it stop?
 

On Thu, 10 Jun 2021 17:45:05 -0400, wrote:

On Thu, 10 Jun 2021 21:32:31 +0000, bob lang
wrote:

I installed knob and tube in the Cleveland area in the early 1960s.
We started to add a green ground and that's what finally killed it.
the cost increased by a third because of the ground and local jurisdictions
also argued over the best way to splice the ground.
Some allowed soldering while other insisted on a crimped connection.


New install - legal and inspected - of K&T in the 1960's ?
OK if you say so ..
John T.

It was legal in the 1968 code except for a few places.

Article 320

320-2. Use. (o) Open wiring on insulators may be used for exposed
work, either inside or outside building; in dry or wet locations;
where subject to corrosive vapors such as covered by Article 480; for
services as covered by Article 230, provided the requirements of this
Article are satisfied. (b) Open wiring on insulators shall not be used
(1) in commercial garages, (2) in theaters, (3) in motion-picture
studios, (4) in hoistways, and (5) in hazardous locations, except in
storage compartments of Class HI locations as provided in Section
503-3 (b).

Article 324 "Concealed K&T"
says pretty much the same thing.

Knob & Tube wiring - when did it stop?
 

On Thu, 10 Jun 2021 17:45:05 -0400, wrote:

On Thu, 10 Jun 2021 21:32:31 +0000, bob lang
wrote:

I installed knob and tube in the Cleveland area in the early 1960s.
We started to add a green ground and that's what finally killed it.
the cost increased by a third because of the ground and local jurisdictions
also argued over the best way to splice the ground.
Some allowed soldering while other insisted on a crimped connection.


New install - legal and inspected - of K&T in the 1960's ?
OK if you say so ..
John T.

In 71 they added assembly halls to the prohibited list but you started
seeing "extensions only" in 75.

Knob & Tube wiring - when did it stop?
 

On Thursday, June 10, 2021 at 5:32:36 PM UTC-4, bob lang wrote:
I installed knob and tube in the Cleveland area in the early 1960s. We started to add a green ground and that's what finally killed it. the cost increased by a third because of the ground and local jurisdictions also argued over the best way to splice the ground. Some allowed soldering while other insisted on a crimped connection.

--
For full context, visit https://www.homeownershub.com/mainte...op-291758-.htm

I would think it would have already been dead by then too, compared to Romex due to
cost, including labor to install. I know here in NJ I have not seen it in any new work in
buildings back to at least WWII.