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Author Topic: Knob & Tube Question  (Read 7634 times)
Cameron Anderson
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« Reply #20 on: March 16, 2011, 09:38:01 PM »

I posted a photo on a new thread of some double taps I found yesterday along with some other gems of home owner wiring. Take a look.
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Michael Merino
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« Reply #21 on: March 18, 2011, 12:23:51 AM »

http://www.inspectapedia.com/electric/Knob_and_Tube_Wiring.htm

I am not sure if you have K&T, but I think it isn't. I see cloth covered wiring and most likely that is tin clad copper. K&T has a rubberized insulation as mentioned by the other guys.
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Jeffrey R. Jonas
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« Reply #22 on: March 20, 2011, 02:43:44 PM »

Casey...

My feelings are hurt! (Enough said)! LOL!!!

Yes... K&T has a cloth mesh jacket,

No... K&T does not (normally) have rubberized insulation,

No... K&T should never be bare wire,

Yes... that appears to be tinned copper,

No... That is not aluminum,

Yes... Aluminum has a "Plastic" type insulation,

Yes... I have seen a home re-wired utilizing the old "Knobs" and "Tubes" with THHN and no grounding wire !!! Friggin' Harry !!!
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Jeffrey R. Jonas
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Jeffrey R. Jonas
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« Reply #23 on: March 20, 2011, 02:48:30 PM »

http://www.inspectapedia.com/aluminum/recogniz.htm
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Jeffrey R. Jonas
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Michael Merino
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« Reply #24 on: March 20, 2011, 05:38:25 PM »

Casey...

My feelings are hurt! (Enough said)! LOL!!!

Yes... K&T has a cloth mesh jacket,

No... K&T does not (normally) have rubberized insulation,

No... K&T should never be bare wire,

Yes... that appears to be tinned copper,

No... That is not aluminum,

Yes... Aluminum has a "Plastic" type insulation,

Yes... I have seen a home re-wired utilizing the old "Knobs" and "Tubes" with THHN and no grounding wire !!! Friggin' Harry !!!

Jeff according to the link I provided, http://www.inspectapedia.com/electric/Knob_and_Tube_Wiring.htm, K&T will have a rubberized cloth insulation, not just cloth. Although asphalt-saturated cotton cloth was used in the beginning, rubber became common.
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Casey Patten
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« Reply #25 on: March 20, 2011, 07:27:50 PM »

Jeff, you were incommunicado when I needed that answer!  Must have hit a bad service spot, I tried calling...or you were just doing 110 down the interstate!  Wink
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Jeffrey R. Jonas
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« Reply #26 on: March 20, 2011, 07:38:29 PM »

Casey...

My feelings are hurt! (Enough said)! LOL!!!

Yes... K&T has a cloth mesh jacket,

No... K&T does not (normally) have rubberized insulation,

No... K&T should never be bare wire,

Yes... that appears to be tinned copper,

No... That is not aluminum,

Yes... Aluminum has a "Plastic" type insulation,

Yes... I have seen a home re-wired utilizing the old "Knobs" and "Tubes" with THHN and no grounding wire !!! Friggin' Harry !!!

Jeff according to the link I provided, http://www.inspectapedia.com/electric/Knob_and_Tube_Wiring.htm, K&T will have a rubberized cloth insulation, not just cloth. Although asphalt-saturated cotton cloth was used in the beginning, rubber became common.
Mike, yes, you are correct. (I didn't read your link). I was just giving a simplified answer to Casey (Based on "real world" for "our" area) as this thread was contradicting itself. I should have been more specific. My "does not have rubberized insulation" actually referred to "without the mesh covering", such as newer wire (conductors). Whether "rubberized" or "asphalt impregnated", K&T always had a "cloth" or "mesh" covering, and was never "bare wire". Hope that didn't confuse Casey even more. If it did, "he knows where I live" !!! Smiley
  
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Jeffrey R. Jonas
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Jeffrey R. Jonas
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« Reply #27 on: March 20, 2011, 07:44:58 PM »

Jeff, you were incommunicado when I needed that answer!  Must have hit a bad service spot, I tried calling...or you were just doing 110 down the interstate!  Wink

Let's see...

Quote from: thread started
Knob & Tube Question
« on: March 09, 2011, 05:39:40 PM »

That would be 04:39:40 PM, Mountain time...

I would have been passing through Rapid City, SD at about that time, and yes, cell service suk'd in western SD.

Okay... your off the hook, for now, but just so you know...

You left no voice mail, and you know, I always return your voice mails !!!  Tongue Tongue Tongue
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Jeffrey R. Jonas
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Casey Patten
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« Reply #28 on: March 20, 2011, 08:37:26 PM »

Nope, I did some more research and made a phone call (sparky) that helped. 

I didn't leave a VM because I needed a quick answer!  Wink  You always return a call, that is quite true...not always the same day though, and I was already pushing the late button on getting the report sent.  Oh, that and being in the truck to the cabin!  lol
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« Reply #29 on: March 22, 2011, 12:45:06 PM »

Photo courtesy of David Macy...


* K&T THHN.jpg (51.68 KB, 800x600 - viewed 171 times.)
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Jeffrey R. Jonas
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Michael Merino
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« Reply #30 on: March 22, 2011, 01:01:05 PM »

Casey...

My feelings are hurt! (Enough said)! LOL!!!

Yes... K&T has a cloth mesh jacket,

No... K&T does not (normally) have rubberized insulation,

No... K&T should never be bare wire,

Yes... that appears to be tinned copper,

No... That is not aluminum,

Yes... Aluminum has a "Plastic" type insulation,

Yes... I have seen a home re-wired utilizing the old "Knobs" and "Tubes" with THHN and no grounding wire !!! Friggin' Harry !!!

Jeff according to the link I provided, http://www.inspectapedia.com/electric/Knob_and_Tube_Wiring.htm, K&T will have a rubberized cloth insulation, not just cloth. Although asphalt-saturated cotton cloth was used in the beginning, rubber became common.
Mike, yes, you are correct. (I didn't read your link). I was just giving a simplified answer to Casey (Based on "real world" for "our" area) as this thread was contradicting itself. I should have been more specific. My "does not have rubberized insulation" actually referred to "without the mesh covering", such as newer wire (conductors). Whether "rubberized" or "asphalt impregnated", K&T always had a "cloth" or "mesh" covering, and was never "bare wire". Hope that didn't confuse Casey even more. If it did, "he knows where I live" !!! Smiley
  

Thanks for clarifying Jeff, I was trying to learn also, so it helped me.
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Casey Patten
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« Reply #31 on: March 22, 2011, 01:06:24 PM »

Nice picture Jeff..."Harry" strikes again!

All the K&T I've seen has had a cloth covering on it.  Most of the time it's degraded, brittle, patched with electrical tape, etc...in other words, it's just not a good system anymore. 
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Marcel R. Cyr
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« Reply #32 on: June 15, 2011, 07:43:29 PM »

First insulation was asphalt-saturated cotton cloth, then rubber became common
http://en.wikipedia.org/wiki/Knob_and_tube_wiring Smiley
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« Reply #33 on: June 15, 2011, 08:58:52 PM »

Marcel, you should start your own site:  "Marcel-a-pedia, for the inspector that has all the questions, we've got the answers!"
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Jeffrey R. Jonas
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« Reply #34 on: June 15, 2011, 09:35:44 PM »

Great idea Casey! It could be Marcel's path to Internet Million's !!! Smiley
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Jeffrey R. Jonas
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« Reply #35 on: June 15, 2011, 09:43:47 PM »

Hey, you never know anymore!  Just have to be the best one at it...very few any better than our Marcel!  Smiley
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