Issues related to the static grounding of motor enclosures

This post was last edited by ssln123 on 2019-8-15 at 11:50. It should be called protective grounding, to prevent the motor from leaking electricity to its casing and causing injury. Static grounding typically involves bonding on pipelines, as well as static discharge devices used when entering tank areas. Details regarding the grounding wires or grounding strips for high-voltage electrical equipment and low-voltage electrical equipment are provided in GB 50169—2016

In anti-static engineering, there are two common methods for laying the ground wires in the anti-static protection zones: First, a ground wire is drawn separately from the buried grounding electrode and laid directly to the anti-static work areas along the production line. For the purpose of preventing static electricity leakage, the grounding wires that are installed separately are usually made of galvanized iron sheet with a thickness of over 1 mm and a width of about 25 mm, or they consist of flexible copper wires with a cross-sectional area of more than 4–6 mm2, which are introduced separately ； II. Utilize the ground wire in the three-phase five-wire power supply system; while introducing the neutral wire of the power supply, a separate ground wire connected to the earth is used as an anti-static grounding bus. This approach is referred to in engineering terms as \"single-point resistance isolation.\" The grounding resistance from the main power distribution box to the earth should be less than 4Ω.

Electrical protective grounding can be regarded as static grounding； The protective grounding used for electrostatic grounding must be separated from the lightning protection grounding.