The efficiency of a cable
screen against electromagnetic disturbances is based upon two distinct
effects.
The electric field component is mainly reflected, whereas the magnetic
component will be attenuated through eddy current losses in the
cable screen.
By applying a layer of ferrite-filled elastomeres (EMC/COM) onto
the screen of a screened cable, it is possible to obtain a considerable
attenuation of the currents that circulate on the outer side of
the screen.
The effect is comparable to the application of ferrite beads along
the cable, but the homogeneous coating of Kabelwerk Eupen's CMS
cables does not cause any steep changes in the impedance, thus avoiding
reflections.
CMS cables are very useful in any circumstances where common mode
disturbances or surface currents are creating problems.
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