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#76922 04/01/01 07:55 PM
Joined: Oct 2000
Posts: 5,392
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sparky Offline OP
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Can i leagally install a Knob & Tubing installation?

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#76923 04/02/01 05:16 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
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You can extend an existing system, but it could create problems with the grounding requirements for switches & receptacles. You can also install it if your AHJ gives you special permission.

K&T is still in the code book, see article 324.

I don't have a clue where you could buy the knobs & tubes. As Red Green would say, you'll probably have to borrow a few from someomes old house, preferably when there is no one home.

Tom


Few things are harder to put up with than the annoyance of a good example.
#76924 04/02/01 08:50 PM
Joined: Oct 2000
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sparky Offline OP
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hmmmm, well i have a K&T feeder ( a tad heavier wire) up to an attic. There it enters an exposed fuse arrangement.

The branches from there out need attention. This particular job has "for-now" aspects and "later-on" ones.

I only know how to rip this stuff out, not replace it, don't even know what type of wire it is...

[Linked Image]

#76925 04/22/01 07:53 PM
Joined: Apr 2001
Posts: 507
G
Member
Quote
Originally posted by sparky:
Can i leagally install a Knob & Tubing installation?

[Linked Image]

sparky,
For heaven's sake! Why would you want to???

#76926 04/23/01 04:53 PM
Joined: Oct 2000
Posts: 5,392
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sparky Offline OP
Member
Gj;
i really don't, but these are the Q's customers ask. They don't know K&T can turn holy water to steam 8' away like we do!

These Q's do bring to mind, however, the NEC's K&T 'nostalgia article' . I would assume it to be more trouble $$$ wise than it's worth ( my cop out answer to the customer), besides, i really don't know how to run a 'compliant' K&T circuit! Do you?
[Linked Image]

#76927 04/23/01 05:22 PM
Joined: Nov 2000
Posts: 2,236
Likes: 1
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I've seen methods of installation in older American Electrician's Handbook copies.

My guess is lots of knot tying!


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
#76928 04/23/01 08:08 PM
Joined: Apr 2001
Posts: 507
G
Member
Quote
Originally posted by sparky:
Gj;
i really don't, but these are the Q's customers ask.

i really don't know how to run a 'compliant' K&T circuit! Do you?
[Linked Image]

If asked I would simply tell them that standard practice is to replace K&T with NM cable. And NO....I wouldn't know where to start with a K&T installation.

#76929 04/23/01 11:59 PM
Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
To me, it would be kind of interesting to do some K&T installation, just to see how it "felt" to use that method.
Couldn't see putting it in some structure for permanent wiring, but it would make a cool display, or maybe a company based tech lessons thingee done in the shop.

Install a few circuits, some switch legs, then heat it up.

Would be cool to say to myself "I have installed Knobs and Tubes, plus separate free air conductors, and in the K&T fashion".

Just my thoughts.

P.S. what's the Insulation type for K&T conductors?? i.e. what's the materials and the NEC / ANSI / IEEE / ?? recognized abbreviations [like THWN: T=Thermoplastic, H= Heat res. {75c}, W=Wet location, N=Nylon jacket]. Think these are correct [??] Feel free to blast away with the flame thrower if needed [Linked Image]

Scott SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
#76930 04/24/01 06:12 AM
Joined: Oct 2000
Posts: 5,392
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sparky Offline OP
Member
Scott;
it would be kinda cool, huh? [Linked Image]

I can't find much on this, materials wise.

Methods wise, i have only met one retiree how was around to install the stuff.

So we'd have to dress in era clothing and apply tools as was done!
-bit& brace
-knot tying manual
-coal fired soldering irons

[Linked Image]

#76931 04/24/01 06:17 AM
Joined: Mar 2001
Posts: 2,056
R
Member
I saw somethng like this once. Don't know if its O.K., but it looked good-

Entering into NM boxes through separate entries, each k&t conductor was supported with a knob within a few inches and protected with loom (the outer cloth covering found on k&t)at entry points. From there NM cable was spliced in to feed non-grounding receptacles in NM boxes. I would guess the best thing to do would be cut the ground wire short enough to make it unusable. It looked neat and sound, but I don't know if it is acceptable.

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