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The mine uses the metal sheath of the grounding trunk, branch or armored cable and the grounding core of the rubber cable, and all the equipment and local grounding poles that need to be grounded, and the main grounding poles installed in the water tank (not less than two groups) Connected to form a grounding grid to reduce the grounding resistance of the system. It can also prevent the short circuit current generated when the different phases of different electrical equipment are grounded at the same time and is not enough to make the overcurrent protection device operate, resulting in equipment and electrical fire accidents.
The protective grounding device must be complete and reliable. The grounding resistance measured at any protective grounding point on the underground grounding grid shall not exceed 2 ohms. The grounding conductor resistance of each mobile electrical device to the grounding conductor shall not exceed 1 ohm.
The main grounding pole located in the water tank or water tank shall be made of steel plate with an area of ​​not less than 0.75 square meters and a thickness of not less than 5 mm. The local grounding electrode installed in the drainage ditch shall be made of steel plate with an area of ​​not less than 0.6 square meters and shall be placed flat in the depth of the ditch. Local grounding poles installed at other locations shall be made of steel pipes of not less than 35 mm in diameter and not less than 1.5 m in length, and shall be buried directly in the ground. There shall be at least 20 holes of not less than 5 mm in diameter on the steel pipe.
Why should mine electrical equipment be grounded?
Operation of electrical equipment may be due to dielectric breakdown, dangerous voltages to ground so that it appears on the other metal objects metal housing and electrical contact with the device. After human contact, there is a possibility of electric shock. In order to avoid the occurrence of electric shock, the most common method is to ground. That is, the metal part of the electrical equipment that is normally not energized is grounded through a grounding device (composed of a grounding body and a grounding wire). In the event of insulation damage, the metal casing (member) is charged, and when the person touches the reef and the outer casing, the current passing through the human body is greatly reduced due to the shunting action of the grounding device. If the electrical equipment is well grounded, the grounding resistance is much smaller than the human body resistance, and the shunting effect is greater. The smaller the current through the human body, the greater the protection effect.