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Instrument, control and electric power cables are fabricated with host of varied international and national manufacturing standards. For this, the type of cable gland to be installed in the cabling system that is positioned in an explosive environment is a sincer concer for essential security of cables and human life the world over. For every cable protection project, a majorly used cable gland involves a cable connector with a sealing ring, cable sealing stopper box or a barrier gland. In case if the wiring system allows in its coding operations, the cable glands with elastomeric sealing rings are used when a specific requirements of the sealing process is satisfied. This article is a simple and presice detail on the significant factors that help to select the right kind of cable gland for a particular installation. It also drives you to the different cable gland sealing techniques that are being used in varied type of projects.
One of the most sensitive and critical stages in the process of designing the cable protection system is selecting the best suited type of cable connectors, cable lugs and cable cleats. This proves to be an effective stage, especially when it has its application in hazardous area. There are other requirements at the time of making decision in selecting a type of explosion proof cable gland for installation in hazardous region apart from the manufacturing standards to be maintained or it has to be listed, approved and tested for its application for a particular type of cabling project.
Here, the other important things concerned at the time of selecting the right type of explosion protection cable gland involves the cable wiring methods, cable gland sealing technique to be used, the type of material that will best fusion up to provide durability and many more critical concerns that can deliver high performance and improved mechanical strength to protect the cables.
Among all, the toughness and reliability of cable glands depend on the cable gland sealing techniques. This is because it directly affects the degree of reaction of the internal components when exposed to the hazardous external environment. Lets see how different type of cable gland sealing technique helps to get more reliability in the cable gland installation!
The traditional version of the cable glands has its own demerits. On one hand the installation process was time consuming and on the other hand the risk of damage increases with the rise in conductors installed in multicore cables. The researchers then ended up with more reliable solution for sealing technique that provides high durability and performance.
The Liquid Resin Seal is a reliable cable sealing technique that starts with flushing out the air completely that is stuck in the process. For this, a low viscosity liquid circulates into the cable interstices completely covering the cable conductors. This helps the liquid resin to circulate around and between the cable connectors that helps to make sure about zero gaps and strong seal.
Where the cable gland installation is to be done in hazardous environment, the Compound Barrier Seal is primetime sealing technique that is proved best for cable connector installation in explosive regions. Here, the barrier seal is fixed around the conductor after the inner cable bedding is finely removed. The barrier seal used in this process should be a standard one with strigent testing performed in explosive atmosphere.
Compression Seal is one of the elastromeric mechanism that has an infirm back in its layout. This central V groove is closed with the pressure applied on both the ends by different degrees during the tightening process. This helps the cable inner bedding to creat a downward seal. Also during the tightening process of the armour clamp, the inner compression seal is concurrently activated.
Other cable gland sealing technique consists a tech savvy design that tightly fits after the cable inner bedding is stretched over. It comprises of a dynamic elastromeric membrane attached to an armour cone. This cable sealing technique is known as a ‘Diaphragm Sealing Ring Technique’.
In contrary to the Compression Sealing Ring, the Displacement Seal Technique does not have a week or an infirm back design. The pressure is applied only from one side with gradually being pushed down at the time of tightening process till it makes an effective seal for the cable. This displacement seal is usually tightened solo from that of the armour clamping process.
The CDS (Compensating Displacement Sealing) system is a sealing technique that follows all the steps of displacement seal method. The only difference is, it has a compensator that provides a room for the cable gland components to completely tighten in addition to controlling the force exerted on the cable inner bedding. Apart from considering cable gland sealing technique as one of the vital factor for selecting a suitable type of cable gland, a strigent inspection is at the rim of the basket to make the whole cable gland installation a success.
BICC Components Limited (BICC) is an expert manufacturer and distributor of cable glands, cable cleats, cable lugs and other cable fittings. Having an experienced team of engineers with a high tech tool room and strong R&D unit, we provide simple and complex customization for the cable gland solution in addition to adoting well defined sealing techniques that suffice with the requirements of all the international standards. Visit https://www.bicccomponents.uk.com/ to know more about our range of cable glands. Please feel free to drop your queries throught an email or a phone call. Visit https://www.bicccomponents.uk.com/contact/ to get in touch.
