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MattBaggins Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Nov-13-04 11:10 PM
Original message
Any Electricians?
Edited on Sat Nov-13-04 11:31 PM by MattBaggins
DU is probably not the best place to ask but what the hey. How does one test knob and tube wiring to see if it is still live? I believe it has all been disconnected but am still worried that someone might have spliced it into some NM wire.
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R3dD0g Donating Member (625 posts) Send PM | Profile | Ignore Sat Nov-13-04 11:13 PM
Response to Original message
1. What is knob & tube wiring?
And what is 'NM' wire?

But to your question. Most electricians just grab the household wire and if it bites them they know it's still alive.
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Wink Donating Member (497 posts) Send PM | Profile | Ignore Sat Nov-13-04 11:16 PM
Response to Reply #1
3. DO NOT DO THIS
This could cause an erratic heartbeat and cardiac arrest. Not likely, but possible.
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MattBaggins Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Nov-13-04 11:21 PM
Response to Reply #1
6. Knob and Tube
Edited on Sat Nov-13-04 11:28 PM by MattBaggins
is an old style wiring where only a hot lead and neutral return are run side by side through the house. Each wire is supported by ceramic knobs (over joists) and tubes(through joists). There is no ground and the wires are wrapped with a rubberized cloth.

NM is generic for non-metallic, ie. the modern day sheathed wiring.
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Old and In the Way Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Nov-13-04 11:22 PM
Response to Reply #1
7. Nomex cable?
Edited on Sat Nov-13-04 11:22 PM by Old and In the Way
Volt meter, set to 120VAC, is the quickest way to check if it's hot
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Wink Donating Member (497 posts) Send PM | Profile | Ignore Sat Nov-13-04 11:15 PM
Response to Original message
2. I am
You really sound lost but here ya go....You need a volt meter. Then you need to set it for voltage AC and measure across two lines and/or each line to ground (a water pipe is a good ground). Either way you should have no voltage. Good luck.
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burrowowl Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Nov-13-04 11:17 PM
Response to Reply #2
4. Insulated test screwdriver
cheaper if it is just household voltage. For bigger stuff no.
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MattBaggins Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Nov-13-04 11:24 PM
Response to Reply #2
8. Knob and tube has no ground
No water pipes in the attic. Really really long ground wire to the basement?
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Rjnerd Donating Member (351 posts) Send PM | Profile | Ignore Sat Nov-13-04 11:18 PM
Response to Original message
5. Played one on TV
I would connect one side of a meter to ground, and probe the wires, looking for voltage. Or I would pull the main breaker, cut the stuff at each end that you can find, restore power and then look for dead circuits. (I would still take the meter, and check the cut ends - in old enough wiring, (or plumbing) assume nothing.


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