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Old 04-24-2019, 06:38 PM   #1
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Default Repairing MI Cable

I have a heat trace cable that is a solid core mineral insulated cable. It was damaged. Have any of you repaired something like this before? It looks more involved than a butt splice lol

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Old 04-24-2019, 07:06 PM   #2
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never done it, but i think i remember reading instructions on it, i think what i was looking at was inconel or stainless sheath and it just took splicing and brazing the sheath. i think i had found the instructions on the internet.

http://integrateddesignandsupply.com...plice%20IS.pdf

i'm not sure if thats it or not ill look some more
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Old 04-24-2019, 07:38 PM   #3
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I believe there is a special course and tools to repair it. Any of the ones I've found that have been damaged it was way easier to just replace the tracer, than try and field repair it.

From Nelson's website:
http://integrateddesignandsupply.com...plice%20IS.pdf


How long is the piece? How tough would it be to replace?
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Old 04-24-2019, 08:12 PM   #4
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Quote:
Originally Posted by glen1971 View Post
I believe there is a special course and tools to repair it. Any of the ones I've found that have been damaged it was way easier to just replace the tracer, than try and field repair it.



From Nelson's website:

http://integrateddesignandsupply.com...plice%20IS.pdf





How long is the piece? How tough would it be to replace?
It's under a commercial driveway, so they'd have to dig the whole thing up.

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Old 04-24-2019, 10:22 PM   #5
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https://www.chromalox.com/en/catalog...ted-heat-trace

An amazing selection for the application.
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Old 04-24-2019, 10:23 PM   #6
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Depending upon where the break is, they may need to dig everything up.

I can't imagine why they selected MI. What a waste of money.
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Old 04-25-2019, 06:27 AM   #7
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Quote:
Originally Posted by telsa View Post
Depending upon where the break is, they may need to dig everything up.

I can't imagine why they selected MI. What a waste of money.
Depending on the year of installation, there were only two options for heat tracing slabs.
MI or hot water. Actually an antifreeze type solution.
Usually this was only on the ramps leading into parking structures
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Old 04-25-2019, 11:19 AM   #8
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I came across it once, rewiring an old house believe it or not. Somebody ran it from the crawl space to a yard water feature type pond , all older than the hills.

Admired their knuckleheadedness and abandoned it from the new wiring entirely.
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Old 04-26-2019, 06:16 PM   #9
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MI cable is very common in Europe , especially explosion proof installations....need the right tools and fittings to repair .As an apprentice many years ago in Scotland I worked nearly every day with MI....it was lots of fun when you had to strip for 6ft tails ; getting the rubber insulating tubing over the copper.
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