Protection for electromagnetic connection and electrostatical discharge

An arrangement for electrically connecting with the aid of shielded cables (10), a first piece of equipment (19) that has good electromagnetic compatibility properties (EMC), by virtue of being enclosed in a first electrically grounded cage (16), to a second piece of equipment (20) having good EMC properties, by virtue of being enclosed in a second electrically grounded cage (17), by drawing the cables through holes (7, 8) in the two cages (16, 17) without impairing the EMC properties of said two pieces of equipment, wherein the first cage (16) is connected to the second cage (17) through the medium of a tube-like element (4b, 5b;

• 12;
• 13);
• the tube-like element (4b, 5b;
• 12;
• 13) is disposed in the proximity of the holes (7, 8) and comprises two elongated U-shaped bars(4b, 5b), the first U-shaped bar (5b) having a first plate (5a) attached to and extending away from the rounded part of the bar with the normal parallel with the axis of said U-shaped bar, the first plate being fastened to a side (2) of the second cage, and a second U-shaped bar (4b) fastened to a side (1) of the first cage, the first plate (5a) is displaceable in a direction perpendicular to the axis of the U-shaped bar thereby pushing the first U-shaped bar (5b) into the second U-shaped bar (4b) and forming a tube of adjustable internal diameter;
• the active internal diameter of the tube-like element (4b, 5b;
• 12;
• 13) is adjusted to equal to the combined diameter of the cables (10);
• the tube-like element (4b, 5b;
• 12;
• 13) is in electrical contact with the shielding (11) on respective cables (10);
• the active area of the holes (7, 8) in said cages is larger than the diameter taken-up by the cables (10) that are passed therethrough;
• the tube-like element (4b, 5b;
• 12;
• 13) is in electrical contact with the two cages (16, 17);
• and the open area of the hole (7) in the first cage is further shielded with a radially displaceable plate (3), the plate having a semicircular recess in the bottom of said plate.