Grounding of switchgear скачать в хорошем качестве

Grounding of switchgear

The maximum short-time withstand current that the grounding circuit should be able to withstand should not be less than 87% of the rated short-time withstand current of the main circuit.The main circuit is grounded according to IEC 60694.All components in the main circuit that are specified or require human access should be reliably grounded and comply with the provisions of IEC 60694; The grounding busbar should be equipped with no less than two terminals connected to the grounding system, and there should be obvious grounding signs;Reliable grounding terminals suitable for specified fault conditions should be installed in the main circuit, which should have a fastening screw or bolt used to connect the grounding conductor. The diameter of the fastening screw or bolt should not be less than 12mm;The grounding connection point should be marked with the protective grounding symbol specified in IEC 60694, and the metal casing connected to the grounding system can be considered as the grounding conductor;The surface of prefabricated cable terminals that can be reached by humans should be coated with a semi conductive or conductive shielding layer. After connecting the semi conductive or conductive shielding layer to the cable terminal, it should be reliably connected to the grounding busbar;The grounding of the casing shall comply with the relevant provisions of IEC 60694.