I have a question regarding the shielding of AC and DC cables.
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Xiaobai has a question. 1. Are both AC and DC subject to interference? I remember that DC is not affected by interference, while AC is. (During the meeting yesterday, the manager said that the DC power cables need to be shielded, but the AC power cables don’t? Did I hear that wrong? ) 2. If it’s necessary to place the power cable and the signal cable together under unavoidable circumstances, does that mean both the power cable and the signal cable need to be shielded? Or should only the signal lines be shielded? (Is shielding only applied to the signal lines, or are there also requirements regarding the voltage level of the power lines?) ) 3. AI: Is the AI signal alternating current or direct current? Thank you!
1 DC small signals are prone to interference; I haven’t heard of AC signals being affected by interference. 2 The power cable and signal cable should be kept together, but they need to be run separately, with a metal partition in between. Only perform single-ended grounding on the signal lines. 3 AI is an analog input; it is DC, and DCS systems generally only accept DC signals.
This post was last edited by Ku Liang Zhi Le on 2019-6-2 at 10:26. It is necessary to distinguish between interference and being interfered with. Shielding is sometimes used to prevent interference with other signals, and sometimes to prevent being interfered with by other signals.
Communication interferes with others; when AI signals are transmitted along with communication signals, interference is bound to occur