How do I test if knob and tube is live?


Old 11-14-05, 11:05 AM
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How do I test if knob and tube is live?

I own a home with some knob and tube wiring. When I bought my house, which was built in the 30s, I understood that there was knob and tube wiring remaining in the second floor. I had planned on hiring someone to replace the knob and tube in the attic floor so that I could install insulation. However, while is was up in the attic recently I discovered that there is both knob and tube and modern wiring up there. So know it seems there is at least the possibility that some if not all of that knob and tube running throught the attic has already been replaced. My question is how do I figure out whether those old wires are still live. Basically I need to know what the proper tool for the job is. Thanks for your help.
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Old 11-14-05, 11:08 AM
Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
Two ways come to mind.

Follow the wires and see where they go.

Use a voltage "tick tester", available at most hardware stores. If it ticks on the knob and tube then it's live.

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