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knob and tube wiring #198093
01/12/11 02:16 PM
01/12/11 02:16 PM
evad73  Offline OP
Member
Joined: Oct 2009
Posts: 10
minnesota,USA
Knob and tube wiring is common in our area. Ideal used to make a contact pocket voltage tester (61-050), it is no longer available. I used it to identify the hot conductor.
Does anyone know of another method to find the hot conductor?

Work Gear for Electricians and the Trades
Re: knob and tube wiring [Re: evad73] #198095
01/12/11 03:19 PM
01/12/11 03:19 PM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
evad 73....

If you have a non-contact type voltage tester it would be a cinch to check which conductor is "hot" on K&T.




Re: knob and tube wiring [Re: electure] #198096
01/12/11 03:56 PM
01/12/11 03:56 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
NY, USA
Originally Posted by electure
evad 73....

If you have a non-contact type voltage tester it would be a cinch to check which conductor is "hot" on K&T.




iagree Top of my must-have tool list.

Bill

Re: knob and tube wiring [Re: Bill Addiss] #198110
01/12/11 11:04 PM
01/12/11 11:04 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
evad:

Showing my age now...long before the 'non-contact' age, internet, cell phones, cordless landlines, and a whole lot of stuff........

Locate a 'ground' somewhere within the building, or if that's not possible, a known neutral point. even if you have to go back to the service entrance. Connect a suitable length of #12 stranded THHN or equal to said point & stretch it out to the location you want to test. You then have to skin a test point on the K&T conductors and use whatever tester (wiggy, digital, etc).

I did not say it was easy or quick; but it works. If I had to do it today, I'd pull out the non-contact, I have an Ideal, Gardner Bender & a TIF. Any of those are available thru WWGrainger, most electrical supply houses and the big boxes. Look in Tools for Electricians in the right hand border ads right here also, you may find one.



John
Re: knob and tube wiring [Re: HotLine1] #198129
01/13/11 08:32 AM
01/13/11 08:32 AM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,360
what HotOne said

with one aside...

i have an office cha cha K&T meter, (one of these)>>>>
[Linked Image]

around here that #12 might need to be run closer to the nuke plant....


~S~

Re: knob and tube wiring [Re: sparky] #198135
01/13/11 11:28 AM
01/13/11 11:28 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
A reminder of days gone by!!! LOL; LMAO


John
Re: knob and tube wiring [Re: HotLine1] #198143
01/13/11 04:01 PM
01/13/11 04:01 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,290
Estero,Fl,usa
Back in the olden days we used neon testers. They could give you some bad indications but I am not sure a ticker is really any more reliable. I still would not stake my life on either of them. They are just indicators, not testers (to steal the language of U/L)


Greg Fretwell
Re: knob and tube wiring [Re: gfretwell] #198150
01/13/11 04:57 PM
01/13/11 04:57 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
Greg:
Are you talking about the neon 'tube' with two leads? If so, how did you do that?



John
Re: knob and tube wiring [Re: HotLine1] #198151
01/13/11 05:18 PM
01/13/11 05:18 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,290
Estero,Fl,usa
You never saw the neon tester pen? They typically have a small screwdriver on one end and a pocket clip. The clip is the "ground" and you are the ground electrode system, capacitively coupled to the earth. There is a megohm resistor there so you won't see circuit current. If you touch the screwdriver to a hot lead, the neon lights. Sometimes you just have to be close to the hot lead. They may not light 100% of the time, particularly if you are very well isolated from ground, like up in an attic on dry truss chords but they usually work OK.

I will root around and see if I can come up with one.


Greg Fretwell
Re: knob and tube wiring [Re: gfretwell] #198155
01/13/11 07:59 PM
01/13/11 07:59 PM
M
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
Non contact volt testers can give neutrals a hot indication where part of a circuit is chopped out and the return is through a load as a result of a bad assumption. When it comes to K&T I treat all the wires as hot until I am the one that cut it and I am not perfect so be careful the neutrals can be very dangerous too.

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