In the industrial process control, the anti-interference ability of the measurement and control device is very high. The anti-interference ability of the measurement and control device determines the uninterrupted work ability of the entire set of industrial equipment. When making system equipment with strong anti-interference ability, the shielding of wires and the grounding of shielding are very important. The key to this is the connection of the shielded cable to the ground of the equipment enclosure. This connection should be a low value connection with a low inductance value. Of course, the secondary connection must also meet the actual operation requirements and must be realized quickly.

The shielding benefit of shielded cables against capacitive and inductive electromagnetic coupling depends to a large extent on the joint quality of the shield connection. The advantages of the Phoenix shield terminal blocks SK are: large contact area with the shield wire, low impedance, and the shield connection voltage drop formed by them together with the terminal fixing bracket AB-SK or the terminal block AK made of metal is very small. A grounded shield on one side can only suppress interference caused by low-frequency capacitive coupling. Low frequency capacitive coupling is caused by high voltage equipment.