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Topic Title: BS 61000-5-2 EMC - Helix in Instrumentation Cables
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Created On: 07 October 2013 03:32 PM
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 07 October 2013 03:32 PM
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IANMOCKFORD

Posts: 3
Joined: 25 July 2008

Could anyone advise if there is a potential issue ( EMC or Increased Inductance ) in twisted pair sheilded cables , either armoured or non armoured where a local 'helix' has been formed when the cable has been terminated at the instrument.

Is there a clause in BS EN61000-5-2 ....section 7.10.2 ! whereby this negates the use of a helix in the cable for tha above reason/s.

The installation is in a hazardous area - gas storage facility.

Regards

Ian M
 09 October 2013 01:56 PM
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oneye

Posts: 165
Joined: 25 February 2008

Interested to know what you mean by:

local 'helix' has been formed..

Twisted pairs generally spiral several times per metre depending on manufacture to reduce common mode interference. I don't see an increase in Inductance

I believe Instrument Cable is availaible untwisted but I can't see any advantage apart from cost.
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