Damaged insulation repair


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Old 03-27-14, 04:20 PM
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Damaged insulation repair

Inside a subpanel I noticed one hot conductor had a small slit (maybe an 1/8") on its insulation and you could see a tiny bit of copper. I slipped an Ideal heat shrink tube over the portion and then gave it a wrap of Scotch 88. Pulling new wire would mean taking the entire panel apart.

What is the harm/danger in 1. having a nicked wire and 2. repaired as I have described? Is my fix complaint and/or sufficient?
 

Last edited by pcboss; 03-27-14 at 05:28 PM.
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Old 03-27-14, 05:29 PM
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Your repair is fine.

The problem with the slit is that it potentially exposed a hot conductor to a grounded surface or touch.
 
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Old 03-28-14, 09:13 AM
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Suppose electrical tape would just be used to repair a slit. Does that portion of the wire under the tape heat up more under load than the wire that has the original insulation?
 
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Old 03-28-14, 09:43 AM
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Insulation is not a factor in the degree of heating.
 
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Old 03-28-14, 09:57 AM
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I would personally not use electrical tape--it could lose it's adhesion and fall off. Heat shrink is the way to go.
 
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Old 03-28-14, 11:25 AM
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Expanding on Mossman's reply: You wrote you:
I slipped an Ideal heat shrink tube over the portion and then gave it a wrap of Scotch 88.
I would have used tape first then heat shrink tubing.
 

Last edited by Nashkat1; 03-28-14 at 01:43 PM. Reason: Format quote
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Old 03-28-14, 11:45 AM
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I would have used tape first then heat shrink tubing.
And your reasoning?

My reasoning was that shrink would form better, more uniformly, to the wire insulation than to a clump of wraps of tape. In fact I was thinking even using the tape was overkill/unnecessary once the shrink is on there?

I would personally not use electrical tape--it could lose it's adhesion and fall off. Heat shrink is the way to go
I agree that shrink is the way to go but I bet scotch 88's adhesion would outlast most of us anyway. I think the majority of repairs like this are done with tape instead of a heatgun and shrink.
 
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Old 03-28-14, 06:52 PM
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I would personally not use electrical tape--it could lose it's adhesion and fall off. Heat shrink is the way to go.
There are a lot of cheap tapes out there that might eventually fall off. I wouldn't worry about the heat shrink in this case and would just use a small amount of properly applied 3M 33+ tape.
 
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Old 03-28-14, 07:08 PM
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When we did exterior connector waterproofing in the Navy...we did a wrap of self vulcanizing tape, followed by a tight wrap of electrical tape (and they actually bought the good stuff) then Scotchcoat (I think it was called) which was a liquid rubber type thing.

I've become a big fan of liquid electrical tape for many uses but if at all possible..heat shrink is what I'd use first.
 
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Old 03-28-14, 07:19 PM
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noticed one hot conductor had a small slit (maybe an 1/8") on its insulation and you could see a tiny bit of copper
It's just a small slit, no need for overkill.
 
 

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