Safety regulations for metal non-metal open pit mines (2)

Table 7 Minimum clearance of wires to hillsides, cliffs, rocks

10.2.7 3~35kV overhead power lines shall not cross buildings whose roofs are flammable materials; if they need to be crossed, they shall be determined in consultation with the relevant competent authorities.
The vertical distance from the conductor to the building: in the case of the maximum calculated sag, it should be no less than 4.0m for the 35kV line and not less than 3.0m for the 3~10kV line.
When an overhead power line below 3kV crosses a building, the vertical distance from the conductor to the building shall be not less than 2.5m in the case of maximum calculated sag.
10.2.8 The distance from the side conductor of the overhead power line to the building shall not be less than the value listed in Table 8 in the case of maximum calculated wind deviation.

Table 8 Minimum distance from side conductors to buildings

Note: The distance between the 1 conductor and the urban multi-storey building or planned building line refers to the horizontal distance.
The distance between the 2 conductors and the urban buildings not within the planned range refers to the clearance, but the horizontal distance in no case shall be not less than 50% of the values ​​listed in the table. [next]
10.3 Substation 10.3.1 The substation shall have an independent lightning protection system and measures to prevent fire, moisture and small animals from entering the live parts.
10.3.2 substation doors should open outwards, the windows should have a metal grid, surrounded by walls or fences should have, and should have the road to the substation.
10.3.3 The switch should be operated by one person and monitored by one person. If an abnormal situation is found, it is necessary to report to the duty schedule and find out the situation before proceeding.
10.3.4 After the line trips, it is forbidden to send power forcibly, report the dispatch immediately, and contact the user to find out the cause and remove the fault before sending power.
10.3.5 When using and handling power outages, the use of the answering machine and work ticket system should be implemented.
10.3.6 During power outages, it is necessary to perform electricity inspection, grounding, locking and hanging signage, and hand over the work card to the operator.
10.3.7 When sending electricity, the work ticket must be signed by the mine dispatcher and contacted by the recording telephone. The operator can send power after returning the work card.
10.4 Illumination 10.4.1 When working at night, all working points and dangerous points should be adequately illuminated.
10.4.2 The voltage used for open-pit mine lighting should be 380/220V.
The voltage of the running light or mobile light should be no higher than 36V.
Operating in metal containers and wet locations, the safe voltage must not exceed 12V.
10.4.3 12V, 36V, 127V and 220V sockets shall have a distinctive mark.
10.4.4 380/220V lighting network, fuses or switches must be installed on the fire line, not on the neutral line.
10.5 Protective earthing 10.5.1 The metal frame or casing, cable and metal sheath of the electrical equipment and equipment, and the secondary winding of the transformer shall be protected and grounded in accordance with relevant regulations.
10.5.2 The grounding wire should be connected in parallel. It is forbidden to ground the grounding wire of each electrical equipment in series.
10.5.3 The resistance of the open-pit mine grounding device shall meet the following requirements; the non-direct grounding system with a neutral point above 1kV shall be no more than 10Ω; the electrical equipment system below 1kV shall be no more than 4Ω.
10.5.4 The grounding resistance should be measured once a year, and the measurement should be carried out in the lowest and driest season of the water table in the area.
10.5.5 Neutral grounding grid below 1kV should be connected to zero system. The terminal of the overhead line should be grounded repeatedly. The line without branches is grounded once every 1~2km.
10.5.6 For repeated grounding of the neutral line of the DC line, an artificial grounding body must be used, and there should be no metal connection with the underground pipe network.
10.5.7 For the supply of low-voltage electrical equipment on the ground outside the stope, a 380/220V neutral point grounding power supply system shall be used. The power supply system with direct neutral grounding shall not be used in the metal mine stop. [next]

11 Waterproofing and fire prevention 11.1 Waterproofing and drainage 11.1.1 Mines must be equipped with anti-drainage and drainage mechanisms. Large and medium-sized open pit mines should have full-time hydrogeologists to establish hydrogeological data files. Water and drainage measures should be established each year and the implementation of the measures should be checked regularly.
11.1.2 Appropriate flood control measures must be taken for the total access and exit of the open pit, the Pingkou, the drainage wellhead and the industrial site.
11.1.3 The mine must establish a drainage system as designed. There should be a water intercepting ditch at the top; for mines with landslides, it is necessary to strengthen water and drainage measures; it is necessary to prevent surface and groundwater from leaking into the stope.
11.1.4 Open pit mines shall be provided with drainage pumping stations as required by design.
In the event of a catastrophic flood, the lowest step is allowed to be temporarily submerged, and all personnel and important equipment should be withdrawn before flooding.
11.1.5 In the process of dewatering of deposits, pits, cracks and possible surface subsidences shall be delineated, signs shall be established and necessary safety measures shall be taken. ;
11.1.6 For mines with submerged danger, the power supply of the main drainage pumping station should be no less than two loops. When any circuit is out of power, the power supply capacity of the remaining lines should be able to bear the maximum drainage load; all drainage equipment must be maintained. Good working condition.
11.2 Fire prevention 11.2.1 For the construction and large-scale equipment of mines, fire-fighting equipment and equipment must be set up according to the relevant fire prevention regulations issued by the state and the requirements of local fire-fighting agencies.
11.2.2 Important mining equipment should be equipped with electrical fire extinguishing equipment. Smoking and open flame lighting are strictly prohibited when the equipment is filled with fuel.
It is forbidden to store gasoline and other flammable and explosive materials on mining equipment, and it is forbidden to scrub equipment with gasoline. Flammable materials such as used oil yarns should be properly managed.
11.2.3 For large and medium-sized mines 15km away from towns, a full-time fire brigade should be established; small-scale mines should set up part-time fire brigades.

12 Industrial Hygiene 12.1 New workers must undergo physical health checks before entering the mine. Those who are not suitable for mining operations may not be employed.
12.2 Workers exposed to dust and other toxic and hazardous substances must undergo regular health checks.
According to the occupational disease range and diagnostic criteria prescribed by the Ministry of Health, the occupational disease identification and review should be carried out on the employees regularly, and the employee health records should be established. If the medical examination identifies an occupational disease or occupational contraindication, and the diagnosis is not suitable for the original work, it should be promptly transferred.
12.3 Sources of dust and toxic and harmful gases such as crushing fields and dumping sites shall be located on the upwind side of the minimum frequency wind direction of industrial sites and residential areas. [next]
12.4 The water source selection, water source sanitation protection and water quality standards for domestic water in mining areas shall comply with the relevant provisions of GB 5749 and TJ 36.
The mining enterprise shall conduct a water quality inspection once a month. If the water quality is unqualified, it shall not be supplied for drinking.
12.5 The concentration of dust and toxic and hazardous substances in the air at the working place shall not exceed the requirements of TJ 36 and shall be measured in accordance with relevant national regulations.
Persons who produce dust and toxic and hazardous operating points must wear personal protective equipment as required.
12.6 Noise at the workplace should not exceed 90dB (A). Measures to prevent noise and fire noise hazards should be actively taken. Workers should wear protective gear in workplaces where noise standards are not met.
12.7 There should be a drinking water station in the stope to timely supply drinking water that meets health standards. Personnel working in remote locations should be sent a kettle that they carry with them.
12.8 Ventilation problems should be properly considered in deep open pit mines.
12.9 There should be a health station or infirmary near the stope, with telephone, emergency medicine and stretcher.
12.10 Mines should take measures to prevent heatstroke or prevent cold according to the characteristics of the climate.
12.11 Dust-proof measures shall be taken for roads transported by open-pit mines.

Additional information:
This standard was proposed by the Ministry of Labor of the People's Republic
This standard was formulated by the Ministry of Metallurgical Industry of the People's Republic
This standard was drafted by the Institute of Safety and Environmental Protection of the Ministry of Metallurgical Industry.
The main drafters of this standard are Zhang Zhong, Wang Honghan, Pang Qizhi, Li Xiaofei, Xiang Liangdu, Lu Kairong, and Huang Qinggang.

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