• • • SAFETYINENGINEERING • • • The inner construction of the cable also needs
careful consideration. For example, multicore cables increase the risk of gas migration and flame transmission through any gaps. To mitigate this risk and maintain Ex d integrity, a barrier type gland is required to seal directly around the cable inner cores. Barrier glands are mandatory for Ex d with unfilled multicore cables (per EN/IEC 60079 14). A correctly specified barrier gland will provide
the peace of mind that gas will be prevented from travelling between the inner cores into neighbouring equipment or enclosures. This is essential in installations where explosive gases (e.g. hydrogen, acetylene, methane, ethylene) are present and pressure differentials exist. As with every element of any cable installation,
cable glands need to comply with industry wide standards. For projects following UKEX/ATEX or IECEx requirements, the key is the EN/IEC 60079 series and every explosive atmosphere cable gland
we sell complies with the strict requirements of these internationally recognised standards. On top of this, glands should carry certification markings that match the explosive atmosphere classification of the system, with temperature ratings that meet or exceed site requirements, gland materials match environmental and chemical exposure profiles and Ingress Protection (IP) ratings align with enclosure and site specifications. Any deviation can make the entire installation non-compliant. And the specification challenge doesn’t
end there:
• Corrosion resistance requirements instruct the choice of product material and coating or plating
• Thread type mismatch is a frequent cause of installation error. Enclosure and gland entry threads need to match in type, length and taper. For Ex d, minimum thread engagement must also meet EN/IEC 60079-1
And, of course, and it should go without saying
that the manufacturer’s installation instructions need to be followed precisely. Cable glands may be small, but their importance in hazardous and explosive atmospheres is mighty.
They protect personnel and infrastructure by maintaining the integrity of the system. Incorrect gland specification or installation increases the risk of a catastrophic explosion, gas migration, or moisture ingress. By following a structured approach, beginning with proper explosive atmosphere classification and matching gland design to cable type, through to confirming certification, assessing environmental conditions and
ensuring correct thread engagement, engineers and installers can achieve the right cable gland specification every time.”
www.cmp-products.com
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electricalengineeringmagazine.co.uk ELECTRICAL ENGINEERING •DECEMBER/JANUARY2026 19
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