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Hradil offshore control cables fully compliant with IEC standard 60079-14
The new Hradil HB44® offshore control cables for use in explosive areas can effectively prevent zone entrainment within the cable
IEC 60079-14: 2014 Annex E.1 requires that a “pumping action,” in other words the entrainment of combustible gases through the cable, must be prevented, a requirement that most cables have thus far been unable to satisfactorily fulfil. Corresponding restricted breathing tests for cables were and are still passed only partially.
The reason for this is that cables do not have a fully compact structure. Open spaces may exist between cores and fillers, allowing combustible gases to flow in, or even spread. This capillary effect means that entrainment cannot be excluded. The risk is even higher when the cable contains porous fillers such as flow tissues and fibrous materials, which exhibit hygroscopic behaviour. While mica tape (muscovite mica or phlogopite mica), which is typically used as an insulator, provides effective protection against high temperatures, it cannot prevent entrainment for the aforementioned reasons.
The new Hradil HB44® offshore control cables not only fulfil the traditional requirements for cables used in explosive areas in terms of mechanical, chemical and thermal loads, but also in terms of zone entrainment. This means that Hradil’s HB44® offshore control cables fully comply with IEC 60079-14, providing suppliers and manufacturers with proof of compliance with the IEC 60079-14.
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