Hazardex 2018 Conference - 22. Coldflow in cables – Some practical advice
31 January 2018
Dr Geof Mood - Technical Director, CCG Cable Terminations Ltd.
Thurs 12.15 – 12.55: Seminar room
The subject of coldflow in cables is poorly understood and this has led to widespread confusion amongst designers, specifiers and installers, particularly in the selection of suitable cable glands to use with affected cable in Ex applications. BS EN / IEC 60079-14 states that the installer should ‘select cable glands to reduce the effects of coldflow characteristics of cable’. However it fails to define what is or is not cable with coldflow characteristics or how it is possible to reduce the effects of coldflow, and if possible how much reduction is needed. This has given some cable gland manufacturers the opportunity to make exaggerated claims for their products and to create an atmosphere of fear amongst specifiers and installers, having them believe that coldflow in cables is a risk in applications where it is not.
Lack of understanding of what coldflow is has also led to a number of installations being carried out with inappropriate cable glands, leading to a need for costly refits in some cases. There is also the very real risk of installations being unsafe, despite the installer following the guidance of BS EN / IEC 60079-14 and using the assurances of the cable gland manufacturer.
This paper will debunk a number of common myths. It provides some practical guidance about what coldflow really is and shows a simple and cheap test method to determine if cables are affected by it. It will also provide straightforward advice about how to eliminate the effects of coldflow and achieve a safe installation if the cable being used is at risk of coldflow. The advice is strictly in compliance with BS EN / IEC 60079-14 and will lead to safer, and in many cases also cheaper, installations.
Geof Mood has spent over 40 years in engineering research work, product development and manufacturing, leading to his current position as Technical Director for CCG Cable Terminations Ltd. More than half of his career has involved product certification to various standards and for the last 11 years he has specialised in the development and certification of high quality cable glands and accessories for use in industrial and hazardous areas.
Geof has been involved in the development of product standards for over 35 years and is currently an active member of a number of national and international standards committees which he attends as a cable gland expert.
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