Motor housing grounded
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Some motors are designed with a dedicated connection for grounding the enclosure, while others have the motor enclosure grounded internally; it’s part of the design, so no separate grounding is required. I’m not sure about this, so I’m asking for help from friends. Thank you!
The motor junction box contains a grounding terminal that needs to be connected to the ground wire
For a 4-core cable, the ground terminal is connected to the PE wire, while the enclosure is also grounded. 3-core cable: the ground terminal is directly grounded to the enclosure. The cross-sectional requirements for the grounding wires of the two are different.
This issue also troubled me once; the answer is as follows: You can check the grounding and static electricity regulations – they specify clearly that in applications where explosion protection and anti-static measures are required, the motor casing must be grounded both on the inside and outside. In ordinary situations, it is sufficient to ground it only at the wiring terminals inside the casing.
Here, things are done in a standardized way: the terminals are grounded along with the enclosure
Ahah, this sea friend should understand the issue of motor grounding in this way! Firstly, both the casing and the interior of the motor are grounded simultaneously. This approach is intended to ensure the safety of operators and the equipment on site; for example, in cases where the grounding wire at the site becomes loose or there is a fault in the cable connection (resulting in a broken ground wire), it still ensures the safety of the operators in case the motor leaks electricity. It is indeed a safe method! Furthermore, since there are various system grounding methods in low-voltage distribution systems, this prevents the risk of ungrounded conditions arising from inconsistent grounding methods. Therefore, for the petrochemical industry and explosion-proof hazardous areas, it is a mandatory requirement to ground the motor casings on-site.
The two principles of working ground and protective ground should be considered, right? L