high pressure:
5.3 of GB/T 11022-1999 stipulates that the grounding terminal of each switchgear should be provided with a reliable grounding terminal suitable for the specified fault condition. The terminal has a fastening screw or bolt for connecting the grounding conductor. The diameter of the fastening screw or bolt should be no less than 12mm. The ground connection point shall be marked with the “protective earth†symbol specified in GB/T 5465.2. The metal casing portion connected to the grounding system can be regarded as a grounding conductor.
The GB of the load switch, the isolating switch and the grounding switch are clearly stipulated to comply with the above provisions. The vacuum circuit breaker does not see the new version of the standard, but Lenovo should have similar regulations.
Low pressure:
GB 14048.2-2001 has no relevant provisions, which may be due to the variety of circuit breakers and the different types of casings.
However, the outer casing of the actual production frame type circuit breaker has a grounding position.
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