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Electromagnetic Interference & Cable Glands Explained


What is EMI?

All electronics, electrical systems and cable runs emit magnetic and electrical energy. If this energy unintentionally interacts with another device and causes it to malfunction, then it is considered interference. Most EMI is caused by frequencies that fall between 1 KHz and 10 GHz, and this range is known as the RFI band, which includes radio and audio frequencies. To protect equipment from EMI the earthing/grounding of enclosures and connections, it has to be engineered so that it has in its simplest form a seamless electrical continuity from point A to point B. The objective is to protect the interior of the system from external environment RFI influences (Susceptibility) and at the same time to protect the external environment from the system (Emission).

What can influence magnetic interference?

Magnetic interference can only be shielded by a ferrous screen of some thickness, such as steel enclosures. With electrical energy, the susceptibility of a system depends on a slot or antenna greater than 1/4 wavelength of the frequencies of concern. The reverse eliminates unwanted frequencies, to prevent interference with other equipment. The power of the signal plays an important role; the stronger the emission and susceptibility, the higher required effectivity of the shielding. Lower frequencies can be shielded by single braid, while medium frequencies double braid. Higher frequencies should use foil or combinations of the two. The weak point on any cable system to an enclosure is the termination of the screen or shield. The above is the briefest description of the subject.

What to keep in mind with EMI:

EMI/RFI/EMC is a specialized field of engineering. With this in mind, expert advice should always be sought for designing efficient and effective systems. The cable gland standard BS EN 50262 states that cable glands are EMI neutral. It is electrically passive until it is installed. Afterwards, it is subject to the design of the earth/ground system and the ability of the installer to make the connection correctly. The design of the cable gland permits excellent connectivity. If done correctly, it will add to the shielding effectiveness of the system.

Please note:

All recommendations, statements and technical data contained herein are based against information deemed to be reliable and correct, but accuracy and completeness of said tests are not guaranteed and are not to be construed as a warranty, either expressed or implied. The user shall rely on their own information and tests to determine suitability of the product for the intended use. Additionally, the user assumes all risk and liability resulting from this use of the product.

Furthermore, the Manufacturer’s sole responsibility shall be to replace that portion of the product the manufacturer proves to be defective. The Manufacturer shall not be liable to the buyer or any third party for injury, loss or damage directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other than those contained in a written agreement signed by an authorised officer of the manufacturer shall not be binding upon the manufacturer.

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