How should the main grounding conductor be connected?
Thread Content
According to the instrument grounding specifications, the main grounding conductor leads to the electrical grounding grid. In actual construction, how is the main grounding plate between the instrument cabinets connected to the electrical grounding grid? Also, how is the protective grounding electrode for on-site equipment connected to the electrical grounding grid?
Use a flat iron for electrical purposes; drill holes in it and then use terminal lugs along with bolts to make the connections
Does this flat iron just need to be connected to the ground, or does it also need to be connected to the electrical substation?
The main grounding conductor is a galvanized flat steel bar, which is then connected to the external grounding flat steel bar (through drilling and bolted connections); a triangular connection at the joint provides greater stability. It is best not to connect this flat bar outside directly to the lightning protection grounding bar in the cabinet room; instead, it should be connected from another location. Ultimately, an equipotential connection is adopted for the entire plant’s grounding grid.
What this diagram shows is that the grounds from various branches of the instruments are combined and then connected to the electrical grounding plate. The instrument cabinet room is usually located together with the electrical cabinet room, and the electrical grounding busbar is definitely shown on the drawings. There are also floor structures that come with pre-installed grounding plates. Weld a ground point and connect the cable to it, and that’s it.
There is a difference between the circular protective grounding in the electrical room and the plant grounding network; connecting it in this way means sharing the grounding with high-voltage circuits, which is not allowed.
Are you sure one is enough? Generally, two are used.
The interior should have a equipotential bonding box, and the grounding resistance must not exceed 4 ohms