Grounding can also be a concern in some installations. If shielded cable is used to connect equipment from two different circuits, a ground loop can occur causing noise on a network line. If the ground voltage difference is great enough it may even cause damage.nstallers will often leave one end of the shielded cable terminated with a non-shielded connector. This is often referred to as a floating shield. This too can cause a different problem. The floating shield often acts as an antenna that picks up additional noise.