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Long-term EMC protection even in dynamic applications: the metallized clamping body ensures a reliable 360⁰ contact to the braided shield.

EMC cable glands

EMC cable glands protect electrical equipment from electromagnetic interference. They fulfil a key function in EMC protection at the critical transitions to enclosures. The cable gland deflects electromagnetic waves over the housing surface according to the Faraday cage principle and thus protects the exposed cables inside the housing.

HUMMEL cable glands with EMC protection are available in three different versions:

  • HSK-M-EMC-D: This premium variant has a metallized clamping body, which ensures a continuous contact with the braided shield of the cable, even in dynamic applications. This cable gland is certified according to UL, cUL and NEMA, an important requirement for international use.

    to the product HSK-M-EMC-D
  • Metrica-M-EMC-E: This cable gland also uses the clamping body principle. This ensures a significantly shorter installation time than with conventional EMC cable glands. It is not necessary to separate the cable shield. The cable is simply stripped in the relevant area, the cable gland is positioned and fixed.

    to the product Metrica-M-EMC-E
  • HSK-M-EMC: This cable gland also offers reliable protection against electromagnetic influences. It follows the classic mounting principle, in which the screen is separated and connected to the gland. The HSK-M-EMC is suitable for solutions in non-dynamic applications where the mounting time is not a major factor.

    to the product HSK-M-EMC
Technical article on the Premium EMC cable gland HSK-M-EMC-D

The metallized clamping insert ensures a secure 360⁰ contact to the shielding braid and thus permanent EMC protection even in dynamic applications.

EMC protection even in dynamic applications

EMC cable gland HSK-M-EMC-D relies on the clamping insert principle

Electromagnetic interference can cause lasting disruption to the functioning of electrical equipment. Shielded cables protect the signal lines from these interference influences - but only until they are inserted into a housing or control cabinet. At these critical transitions, it is the task of the cable gland to protect the exposed lines inside the housing from electromagnetic waves. It dissipates these waves via the surface of the housing, thereby using the principle of the Faraday cage to protect the cabling and the components inside.

Component manufacturers use a wide range of techniques for EMC protection. However, a clamping element integrated in the cable gland has proven its worth, which ensures a complete contact of the shielding braid. The cable gland HSK-M-EMC-D EMC from HUMMEL AG also follows this principle. When the union nut is tightened, the metallized clamping body is fixed to the shielding all round. The advantage: this design also withstands dynamic applications. There can be no gaps in the connection due to assembly errors or material fatigue. The 3600 protection is permanently guaranteed.

In addition, the assembly time for the premium screw connection HSK-M-EMC-D is significantly shorter. With conventional systems, the shielding has to be laboriously separated, precisely fitted and fixed. With the clamping insert principle, it is not even necessary to separate the shielding. The cable is stripped in the relevant area, the cable gland with the integrated clamping element is positioned and tightened.

The HSK-M-EMC-D is certified according to UL, cUL and NEMA. This is important for all machine and plant manufacturers serving the North American market. UL certification is virtually obligatory there, because without UL there is no insurance cover. Plant manufacturers have clear advantages if they can present certificates for all their components and assemblies. This saves time and costs on site when commissioning the machines. The NEMA protection classes are only partially comparable with the European concept of IP protection classes. NEMA distinguishes between indoor and outdoor applications. That is why machine builders have to look very carefully. An indoor certificate for a component is of little use if the system will later be outdoors.

The EMC cable glands from HUMMEL AG are available in metric, NPT and PG thread types. Ex-versions for potentially explosive atmospheres are also available. The cable glands fulfil protection class IP68 / IP 69K.

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