Is the shield of the control and communication cables grounded or grounded at both ends?
That depends on what environment, the general chemical enterprises require DCS system, only one end of the ground, to prevent interference signal.
But when the two ends are grounded, the shielding layer of the cable and the earth form a closed loop, and in the interference of various electromagnetic fields, a stray circulation will be formed, which will affect the shielding effectiveness. Therefore, when this happens, one end of the earth should be grounded to avoid the formation of loop.
In fact, the best shielding ground, but can not be achieved, only two grounding.
