On-site instrument on-site grounding
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Should the field instrument be grounded on-site? Is it connected to the metal frame, or does it require separate grounding? Can this separate grounding be connected to the electrical ground?
Generally, it is connected to the metal frame and eventually tied to the overall grounding network. If very high requirements are needed, separate grounding is required.
We usually do it this way, but some people say there’s thundering and such, as well as the impact of welders during construction
We usually do it this way, but some people say there’s thundering and such, as well as the impact of welders during construction
Modern instruments usually come equipped with safety barriers and surge protection, so such problems do not occur. However, the cabinets are generally grounded, while on-site grounding is less common; it is crucial to avoid dual grounding at all costs.
The vast majority of field instruments do not require their enclosures to be grounded; grounding is something that creates unnecessary problems. If it isn’t done properly, it can lead to troubles, and then you’ll be in trouble~~~
The last edit to this post was made by 1111111 on 2018-4-20 at 11:07. The probability of a lightning strike hitting the instrument enclosure directly is equal to 0.000000000000000000000000000000000....... Lightning strikes are almost always induced lightning strikes; the path of interference is through the power grid, into the power supply, and then to the instruments on site. . . So grounding the instrument enclosure is completely useless for protecting against interference. . . If the grounding is not proper, during a lightning strike, interference can travel through the ground and reach the enclosure of your instruments as well. . .
What the original poster is saying is that the enclosure of the on-site instrument should be connected to the frame, and the instrument wires need to be grounded in the control cabinet. It is necessary to make a clear distinction in specific cases
It refers to the grounding of the enclosure; only a small number of instruments have such a requirement
The instrument is grounded at one end, while the instrument enclosure is not grounded on-site. Which standard specifies this requirement? If anyone knows, please let me know; I need to use this information to confront my stupid boss. I saw it once a long time ago; I forgot what the standard was, and after trying to find it again, I couldn’t locate it.