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Old 01-10-2011, 07:36 AM   #1
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Safety concern Al wiring?


House was built in 1930. Wiring is knob and tube. I am trying to get rid of the knob and tube a little at a time. While doing renovations I found that a previous home owner has done his own wiring. Found 2 junction boxes behind walls, which I know is against code.

The main thing that concerns me is that he has connected new copper to the old knob and tube. I know that aluminum to copper connections must be done with special materials to be safe, but I am not sure if the knob and tube is aluminum. There are no signs of overheating of the wires and the wirenuts that he used are still in tact, which leads me to believe that the wiring is not aluminum. If it's not Al, what material can it be and is it safe to connect it to copper? I'm not sure how many more junction boxes may be hidden.

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Old 01-10-2011, 07:58 AM   #2
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Safety concern Al wiring?


I ask because the knob and tube is not the color of copper. I did a little research and think it may be tinned copper or plated copper. Was aluminum wiring used in the 1930s?

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Old 01-10-2011, 07:59 AM   #3
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Safety concern Al wiring?


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If it's not Al, what material can it be and is it safe to connect it to copper?
Ayuh,... All the knob, 'n tube wiring I've replaced was Copper...
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Old 01-10-2011, 08:04 AM   #4
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Safety concern Al wiring?


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I ask because the knob and tube is not the color of copper. I did a little research and think it may be tinned copper or plated copper. Was aluminum wiring used in the 1930s?
Cut a piece and see if it is copper. I bet it is.
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Old 01-10-2011, 08:15 AM   #5
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Safety concern Al wiring?


Del,

I'll be sure to take a close look at the wire after work today. Knowing that it is most likely copper will help me sleep better at night. Thanks.
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Old 01-10-2011, 09:15 AM   #6
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Safety concern Al wiring?


All the K&T I have ever seen is copper.

While K&T can be left in place and used, you are not allowed (by code) to add to or extend K&T. That means you are not supposed to making connections to it. Although I believe you can make a connection to K&T for the purpose of a new service panel upgrade.
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Old 01-10-2011, 09:21 AM   #7
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Safety concern Al wiring?


RJ,

I understand that this is not allowed. The fact of the matter is that these connections were made by a previous owner. I am in the process of making it right, and during the process I have found J-boxes behind walls with the K&T extended. My concern with the safety of the Al-Cu connection was for the possibility of other J-boxes done the same way that I have not yet found. Thanks for the info though.
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Old 01-10-2011, 02:35 PM   #8
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Safety concern Al wiring?


Never seen aluminum K&T it is probably "tinned" copper wire.
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Old 01-10-2011, 04:22 PM   #9
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Safety concern Al wiring?


Al wire didn't exist until long after K&T had fellin out of favor. You can bet its tinned coper.

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