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Old 11-17-2010, 06:58 AM   #1
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House 100 years old the knob and tube was replaced the year I don't know, when working with switches and outlets I find the insulation falls off when you move the wires to much, I tape them where they crack the best I can I don't think it good enough. Has anybody ever used shrink tube on the wires and can shrink tube be shrunk with a hairdryer? The wires are not brittle and are in good shape it's just the insulation. Replacing the wires would be a nightmare. Open to all suggestions.

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Old 11-17-2010, 08:37 AM   #2
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I have done this to a limited degree with heat shrink. You need a heat gun or a lighter or a small torch.

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Old 11-17-2010, 10:40 AM   #3
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Thanks Jim
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Old 11-17-2010, 07:54 PM   #4
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My 1948 home has some rubber and cotton covered romex wire installed. Its in good shape, except in the junction boxes where the air can get at it.
It was next to impossible to install new cable, so removed the cable clamps from the box. This allowed me to wrap electrical tape as close to the sheath as possible. Then I slipped heat shrink tubing over the tape.
After shrinking the tubing with a match, I replaced the cable clamps.
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Old 11-17-2010, 09:19 PM   #5
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Are you sure all the wires were replaced. Insulation doesn't go bad on new cables especially in switch boxes. In ceiling fixtures where heat is present it is more common. By new, I mean as far back as the 70s or even the 60s.
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Old 11-17-2010, 10:57 PM   #6
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Are you sure all the wires were replaced. Insulation doesn't go bad on new cables especially in switch boxes. In ceiling fixtures where heat is present it is more common. By new, I mean as far back as the 70s or even the 60s.
Are you asking me or the OP? My place is 62 years old! (1948)
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Old 11-18-2010, 06:18 AM   #7
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Are you sure all the wires were replaced. Insulation doesn't go bad on new cables especially in switch boxes. In ceiling fixtures where heat is present it is more common. By new, I mean as far back as the 70s or even the 60s.
Yes it has been replaced the insulation is like a black tar with looks like twine wrapped around it and it has colors but they are very hard to see,
red,white, black. Looks like something from the 50s. I think it might be bx hard to see in the boxes, but it looks like anti shorts at the hold down.
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Old 11-18-2010, 08:10 AM   #8
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Heat shrink will work. But I think this wire is older than you think and should be scheduled to be replaced. I am thinking they only replaced the K&T that was visible and easy to remove. The rest was left in the walls and ceilings.
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Old 11-18-2010, 09:01 AM   #9
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Thanks any and all comments welcome.

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