This standard specifies normal operating procedures that should be performed to ensure personal safety. This standard system is applicable to the design, installation and operation of electrical devices and systems under harsh outdoor conditions (including open-pit mines, quarries, stockpiles and similar places). It is especially applicable to the following electrical devices and systems: a. Mining, stacking Retrieval and primary processing machinery; b. Secondary processing machinery; c. Conveying system; d. Drainage and water supply system; e. Movable railway system; f. Fixed railway system (operation only); g. Electric truck; h. Power generation and distribution equipment; I. Control, monitoring, signaling, communication systems; j. Auxiliary equipment. GB 9089.5-1995 Requirements for the operation of electrical devices under severe outdoor conditions GB9089.5-1995 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Electrical installations for outdoorites under heavy conditionsOperating requirements
GB 9089.5-1995
This standard is the fifth part of the national standard GB9089 "Electrical Devices Under Outdoor Severe Conditions". This standard is equivalent to the international standard IEC621-5 (1987) Part 5 Operational Requirements for Electrical Devices Under Outdoor Severe Conditions (Including Open-pit Mines and Quarrying). The national standard "Electrical Devices for Outdoor Severe Conditions" includes the following parts: Part 1 Terms and Definitions
Part 2
General Protection Requirements
Part 3
Equipment and General requirements for accessories
Part 4
Installation requirements
Part 5 Main
Operation requirements
Part 6 Maintenance requirements
This standard system provides guiding principles for the design, installation and operation of electrical devices and systems to ensure the safety of people, livestock and property and the normal operation of equipment.
Subject content and scope of application
This standard specifies the normal operating procedures that should be performed to ensure personal safety. This standard system is applicable to the design, installation and operation of electrical devices and systems under severe outdoor conditions (including open-pit mines, quarries, stockpiles and similar places). It is especially applicable to the following electrical devices and systems: a.|| tt||b.
c.
d.
e.
f.
g.
h.||tt ||i
j.
Excavation, stacking and primary processing machinery;
Secondary processing machinery;
Conveying systems;
Drainage and water supply Systems;
Mobile railway systems;
Fixed railway systems (operation only);
Electric trucks;
Generation and distribution equipment;
Control, monitoring, signaling, communication systems: auxiliary equipment.
Note: The working conditions of electrical devices under harsh conditions in outdoor places are relatively special. They work in scattered places and are responsible for heavy-duty transportation and stacking tasks. The electrical devices used in this situation have the following characteristics: the devices and systems have to change positions frequently;
a.
b. The working area is large and continuously extending; c.
Influence of special environment
Approved by the State Bureau of Technical Supervision on 1995-08-29 12
Implemented on 1996-08-07||tt ||2 Reference standards
GB 9089.5--1995
CB9089.2--88 General protection requirements for electrical facilities in outdoor places under severe conditions, [negIEC621.2 (1987) 3 for personnel entry operations Area restrictions
3.1 Entering the (normal) operating area
If the barriers and exterior protection have been installed in place in accordance with Chapter 4 of GB9089.2, entry into the (normal) operating area There are no restrictions on personnel.
When opening or removing the barriers and outer protection according to Article 4.3 of GB9089.2, except for the circumstances specified in Articles 4.3.2, 4.3.3, and 4.3.4, only skilled personnel or junior personnel are allowed to do so. Personnel execution. After the barriers and outer protection are removed, when the exposed live parts are not isolated from the power supply in accordance with Article 4.3, temporary barriers and warning signs must be installed. 3.2 Entering the electrical operating area and the enclosed electrical operating area. Except that the exposed live parts have been isolated from the power supply in accordance with GB9089.2 Article 4.3, only the following personnel are allowed to enter the electrical operating area and the enclosed electrical operating area
a ．
Skilled personnel;
b.
Junior personnel:
c.
Common personnel accompanied by skilled personnel and junior personnel. 4 Personnel operating near exposed live parts 4.1
General requirements
When it is necessary to operate near exposed live parts with a nominal voltage greater than AC 50V or DC 120V, the following requirements should be met a. Comply with the minimum approach distance specified in Article 4.2; b. Isolate the power supply of the exposed live parts according to Article 4.3; c. Junior personnel or skilled personnel shall comply with the special provisions of Article 4.4. 4.2 Minimum proximity distance
Except as permitted by Article 4.4, the proximity distance between any part of the human body and any object in contact with people (except operating parts with special insulation) shall not be close to exposed live parts. Less than the value specified in Table 1. Note: ① To facilitate compliance with the minimum approach distance regulations, ropes, barriers or similar measures may be used. ②The minimum approach distance specified in Table 1 depends on: there is a stable working surface and the exposed live parts are fastened in its position. If the above conditions cannot be met, the distance should be increased to leave margin for possible position movement. ③When operating near overhead lines, the minimum approach distance specified in Table 1 should be increased. Operators must be particularly careful when using long objects, such as ladders, metal movable stands, pipes, etc., to work near exposed live parts. It is recommended that at least two people move these objects horizontally with support and supervision. 4.3 Isolation of exposed live parts
When operations must be performed near exposed live parts, but the minimum proximity distance is less than the value specified in Table 1, the power supply of the exposed live parts must be isolated. The above requirements do not apply to situations where junior personnel or skilled personnel perform operations in accordance with Article 4.4. 13
nominal voltage (phase to phase)
ky
1
6
10
20
30|| tt||35
45
60
66
110
150
220
GB9089.5-1995
Table 1 Minimum approach distance of personnel 1)
Minimum approach distance
mm
23
90
150||tt| |215
325
410
520
700
750
1100
1550
2200
Note: 1) The specified minimum proximity distance has taken into account that the system voltage may change up to 20% of the nominal voltage. 2) The minimum approach distance is not specified. Avoid contact with live parts. For devices with nominal voltage above 1000V. This isolation should also include short-circuiting and grounding of the involved components. Operations can only begin after skilled personnel confirm that power isolation, short-circuiting and grounding have been properly completed and give their consent. For the purpose of testing, the short circuit and grounding can be removed for a short period of time, but corresponding measures should be taken to ensure personal safety. Skilled personnel should ensure that those operating in the area are fully aware of the isolated parts of the area and the work being performed. Skilled personnel should know which locations may produce dangerous voltages due to induction from adjacent live conductors and ensure that appropriate protective measures are taken where necessary.
When the exposed live parts have been isolated, including the relevant parts short-circuited and grounded, but there are unisolated exposed live parts in the vicinity, obvious warning signs should be set up to prevent contact with the adjacent exposed parts. Contact of live parts. 4.4 Operations close to exposed live parts
4.4.1 General
When it is necessary to perform operations above or in the immediate vicinity of exposed live parts with a rated operating voltage higher than 1000V, the distance should be less than Table 1 When the minimum approach distance is specified and it is impossible to isolate the power supply of this part according to Article 4.3, the work can be carried out with electricity provided that the measures mentioned in Articles 4.4.2 and 4.4.3 are taken.
4.4.2 Person in charge
A skilled person must be designated to be responsible for this work. Before work begins, skilled personnel should complete the following tasks: Develop a detailed description of the nature and location of the work to be performed; a. b.
Make all relevant personnel fully aware of their respective responsibilities and precautions. c.
Skilled personnel should ensure that everyone participating in the operation is under their own supervision during operation. 4.4.3 Protective equipment
Appropriate protective equipment must be used and regularly inspected to confirm that the equipment continues to be effective. 5 Activities of vehicles and machinery near overhead lines 5.1 General rules
14
GB 9089.5--1995
Vehicles and machinery operating near overhead lines shall comply with the spacing requirements specified in Articles 5.2 and 5.3, except for the special circumstances of Article 5.4.
The minimum distances specified in Articles 5.2 and 5.3 also apply to persons on vehicles or machinery. If the overhead lines have been isolated from the power supply in accordance with Article 4.3, the minimum spacing specified in Articles 5.2 and 5.3 may not be implemented. 5.2 Vertical Spacing
Vehicles and machinery shall comply with the minimum spacing specified in Table 2 when passing under the overhead lines. Spacing refers to the distance from the highest point of the vehicle or machinery to the overhead line.
When vehicles or machinery need to pass under overhead lines (i.e. designated traffic intersections) due to normal work, but the minimum spacing cannot fully meet the requirements in Table 2, they should be placed on both sides of the line according to Table 2 Provide a height inspection structure, such as a gantry, to indicate the maximum allowable height from the road surface.
5.3 Horizontal spacing
When vehicles or machinery operate near overhead lines and their height cannot meet the minimum vertical spacing requirements specified in Article 5.2, their horizontal spacing shall not be less than the minimum spacing value specified in Table 2 . When the horizontal working direction of the vehicle or machinery cannot be fully controlled, a larger horizontal distance should be maintained.
Table 2 Minimum spacing between vehicles and machinery when operating under and near overhead lines!) Nominal voltage (phase to phase)
Root mean square value (kV)
1
30
60
110
220
Minimum approach distance (mm>2)
1000
2300
2500
3.000
4000
Note: 1) The specified minimum spacing has taken into account that the system voltage change may reach 20% of the rated operating voltage. 2) Allowance should also be left for possible sag and swing in the line. 5.4 Allowed reduced spacing
The spacing specified in Articles 5.2 and 5.3 may be reduced in one of the following circumstances: vehicles or machinery are moving on limited roads, such as on tracks; a.||tt| |When vehicles or machinery are moving, they should be monitored by junior personnel or skilled personnel; b.
C.
The indirect contact protection of vehicles or machinery complies with the regulations of GB9089.2. 6 Changes in operation
6.1 Maintenance of protection
Changes in operation shall not affect the protection requirements specified in GB9089.2. Such changes include extending the work site (which requires extending power cords or cables), building roads, and adding equipment. Issues that should be considered include electrical clearances, protection of electrical installations, cross-sections of protective conductors, overload and short-circuit protection, undervoltage, lightning strikes, anticipated contact voltages, etc. 6.2 Reduction of spacing
Care must be taken not to reduce the spacing between overhead lines and the ground below the allowable value due to material stacking or dumping, changes in topography or storage areas.
6.3 Excavation operations near electrical installations
No excavation of materials or other excavation operations shall affect the soundness of the foundations of nearby poles, towers or other supports, nor shall they affect the grounding conductors or The function of the ground electrode. 6.4 Integrity of safety circuits and safety devices 15
GB 9089.5--- 1995
Measures must be taken to ensure that safety circuits and safety devices are not destroyed. Exceptions are made where alternative safety measures have been taken. 7 Movement of cables
7.1 Movable power distribution cables
Except for specially designed cables that can be moved with electricity, all movable power distribution cables must be powered off before moving. Cable movement must comply with the minimum temperature and minimum bending radius requirements specified by the manufacturer. Before the cable connector is reconnected, appropriate inspection and testing must be done to ensure that it has good conductivity and insulation. 7.2 Tow cables and coiled cables
For tow cables and coiled cables that are moved by machinery, measures must be taken to prevent the cable ends on the machine from bearing direct mechanical tension.
The length of the trailing cable should be left with a margin, and it should be placed in a figure-8 or B-shaped position near the machinery for backup. When placing trolley cables and coiled cables, consideration must be given to minimizing possible damage caused by rocks, stones, etc. All trolley cables and coiled cables must be regularly inspected to ensure that they move freely and are free of damage. When moving dragline cables and coiled cables requires separation from the cable connector, the power source must first be isolated before operation. This requirement does not apply to low voltage and low current cables. Such as control cables. 8 Protection of cables
Cables that are susceptible to damage due to vehicle and mechanical activities should be placed in a clearly visible location or properly protected. Protection methods can be used: using ramps or coverings;
a.
b. Cover with suitable loose materials;
Set up warning flags, signs or fences;
c.
d. Build an earth embankment;
e.
be buried in a pipe under the designated road surface;
use an overhead cable bridge:
f.Www.bzxZ.net
Cables are supported above ground level.
g.
9 Relocation of Overhead Lines
Before relocation of overhead lines, all conductors must be isolated from the power supply in accordance with Article 4.3. When lightning occurs in the area where overhead lines are located, all operations of line relocation should be stopped. All personnel operating above the ground must wear safety belts and safety helmets, and must operate under the supervision of a guardian. Precautions should be taken to ensure the structural stability of all poles and towers, and the removal of one section of wire should not cause instability in other sections.
During the disassembly and installation of lines, vehicles and machinery must be prohibited from passing under or above the lines. Except where appropriate protective measures have been taken.
The safety of relevant personnel must not be endangered when the pole position is moved. Before the line is reinstalled, all poles including insulators and cross arms along the entire length of the line must be inspected. The foundations of re-erected poles must be stable. The conductors must be inspected before being re-erected before they can be used again. 10 Electric detonation operation
When using an electric detonator, it is necessary to prevent misdetonation or misdetonation caused by other electrical energy other than the intended detonation power source. Note: The current flowing into the earth through different paths due to various reasons is called miscellaneous detonation. dissipate current. It may become the detonation power source of the electric detonator. Recommended measures to reduce the false detonation of the electric detonator are shown in Appendix A.
16
11 Additional requirements and precautions
11.1 Precautions during thunderstorms
GB9089.5-1995
In situations where a direct lightning strike or induction may occur In areas with hazardous voltages, do not handle or service downed power cables or overhead lines during a thunderstorm.
11.2 Early warning signs
For potential dangers, early warning signs must be set and properly maintained. 11.3 Removal of protective barriers
Protective fences and other exterior protective materials may only be removed when absolutely necessary and after appropriate precautions have been taken. Measures must be taken to promptly replace these fences and outer protective materials after the operation is completed. 11.4 Operations related to long metal components
When long metal components (such as movable conveyors, pipe systems) are installed parallel to overhead lines, attention must be paid to the dangers caused by possible induced voltages.
12 Operation of temporary installations
Temporary installations must comply with the general protection requirements of GB9089.2. 17
A1 General precautions
GB 9089.5-1995
Appendix A
Recommended measures to reduce the accidental detonation of electric detonators (reference parts)
Use The general methods to prevent early detonation of electric detonators are: a. Use appropriately insulated detonation cables;
b.
Cables should avoid joints as much as possible:
Adjacent cable cores The wire connectors must be staggered, firmly connected and well insulated; C.
d. Only connect the detonating cable to the detonator when detonating. At other times, the detonating cable should be short-circuited and insulated from the earth; frequency-sensitive detonators and detonators should be used. This kind of appliance only responds to high frequency (15000Hz) and does not respond to frequencies of 50 to 60Hz.

Recommendations A2 to A9 include specific additional measures to reduce accidental detonation. A2 IT systems that can continue to operate after the first ground fault Any electrical device that is allowed to continue to operate after the first ground fault occurs (see GB9089.2 Chapter 13.4), electric detonators should not be stored or used.
A3 exposed conductive parts and external conductive part electric detonators and their connecting cables should not be used near exposed conductive parts and external conductive parts to avoid ground fault currents caused by protective equipment operating time Detonate early. A4 Overhead Lines
Electric detonators and their connecting cables should not be used near overhead lines. When a ground fault occurs on an overhead line, stray currents may occur within the cable. Overhead lines can also cause other hazards when they fall to the ground. A5
Battery Effect
Different metals contact each other directly or through conductive media (such as salt water, alkaline drilling mud, etc.), which can produce a battery effect. Metal gaskets, metal rods or other conductive objects should therefore be avoided. A6 Cathodic Protection
Electric detonators and their connecting cables cannot be used near pipelines or structures used for cathodic protection. When laying and detonating operations near it, the power supply used for cathodic protection should be isolated. A7 Electromagnetic Radiation
High-frequency electromagnetic energy emitted by radio, television, and radar stations can detonate electric detonators under certain conditions. Portable radio transmitters should not be used near electric detonators and their connecting cables. It should be clear whether there are fixed launch points near the operating area. A8 Static electricity
Dust storms, snowstorms, movable conveyor systems, pneumatic loading systems, etc. may generate electrostatic charges. If static charge is allowed to accumulate or accumulate on people and objects, there is a risk of electrical detonator discharge. 18
GB9089.5--1995
It is recommended to suspend triggering of storms during dust storms or snow storms. And connect all persons or equipment that may accumulate static charges to the ground. The resistance connected to ground should be sufficient to limit the current and at the same time discharge the static charge (a resistance value of 10° is suitable). This is achieved by using semi-conductive materials for the operator's shoes, hoses and conveyor belts of the pneumatic loading system. 9Thunder and lightning
A9
Atmospheric lightning interference can induce current in the electric detonation circuit to detonate the electric detonator. It is recommended to suspend emplacement and detonation operations during thunderstorms and to evacuate personnel from the operating area. Additional notes:
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Electrical Devices Under Outdoor Severe Conditions. This standard is drafted by the Machinery Standardization Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Li Shilin, Guo Ting, Liu Guiyuan, Feng Zongheng, Li Shixin, and Zhang Ziliang. 19
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