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Topic Title: cable termination
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Created On: 01 January 2012 05:57 AM
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 01 January 2012 05:57 AM
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srab

Posts: 1
Joined: 01 January 2012

We have old cable terminations which keep failing and quote us by surprise. is their any testing method which can give us warning once the detrrioation started.
 01 January 2012 07:03 PM
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ArthurHall

Posts: 735
Joined: 25 July 2008

How to they fail? Is it an insulation breakdown or overheating?
What is the voltage and current, what is the enviroment?
 01 January 2012 09:15 PM
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williamjohn

Posts: 178
Joined: 22 November 2010

Hi srab
If your cables are PILC (Paper Insulated Lead Covered), the terminations are probabely filled with bitumen. There are different grades of bitumen. Bitumen for cold climates will not set hard in a hot climate. Bitumen for a hot climate will crack in a cold climate. This is nothing to do with deterioration, just the temperature and grade of bitumen. If you are in the Northern Hemisphere and put this posting now, I suspect your bitumen is cracking. There is not much you can do about this except remake all the terminations using a different grade of bitumen.

Best wishes
John
 06 May 2012 07:50 AM
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pulse90

Posts: 11
Joined: 19 April 2012

Hi Srab,
Please tell me which cable you are using?

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 26 June 2012 01:00 AM
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stableford

Posts: 64
Joined: 04 April 2006

Thermal Infra Red scan, would be a good place to start looking at, from a preventative maintenance side of things.

Fluke, Flir and many others provide cameras, and can also be hired.

Most cable types will work, although if its high voltage cable on a low voltage VFD, it will run hotter than normal.

I have seen this in the water industry, so that smaller cables with better bending radii could be used in the compartment.

Regards

Derrick
IET » Energy » cable termination

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