As the power supply equipment for enterprise production and office, the distribution box is one of the key points of enterprise safety management. Once accidentally misoperated, it is likely to cause ** fire, and the scene is extremely terrifying! Let's look at this case.
It can be seen from the **picture** that due to an operation by the worker, the distribution box happened instantly**, I don't know if the person is okay?
Curious peopleWhy does the distribution box happen**?
The distribution box** is caused by a short circuit. The short circuit of the wire usually used will emit a larger sound and fire, the distribution box is close to the power supply, the short-circuit current is much larger than the usual short circuit, the bus bar section in the distribution box is large, and the instantaneous high temperature and strong electric power formed by the short-circuit current during the short circuit will synthesize the first air wave and blow up the distribution box.
3 workers repaired the distribution cabinet, and there was a tragedy with a "bang".
3 maintenance workers overhaul the power distribution room, instantly**.
Employees operate in one meal, electrical box**.
Distribution box**, the operator becomes a fire man
The staff pulled the switch in the power distribution room, and the fire rushed out directly at the moment it was pulled down! 
2 workers overhaul the ...... of sudden deflagrationTherefore, non-professional electricians, don't mess with the switch in the distribution box, the consequences are really terrifying!
Of course, the "professional" personnel should also be cautious and operate according to the regulations when operating the distribution box, otherwise, the above accident scenarios will be staged again!
Precautions for safe operation of the distribution room
1. Before working, it is necessary to check whether the tools, measuring instruments and protective equipment are in good condition.
2. Any electrical equipment that has not experienced electricity shall be regarded as having electricity and shall not be touched by hand.
3. When repairing electrical equipment, it must be operated by power-off, and hang up the sign of "prohibiting closing, someone working", and verify that there is no electricity before the work can be carried out.
4. When working on the distribution panel and bus, after verifying that there is no electricity, the temporary grounding wire should be connected, and the installation and disassembly of the grounding wire must be carried out by an electrician.
5. At work, if there is a change of person or shift, the first person must re-check the power supply, confirm that it has been disconnected, and verify that there is no power before it can be put into work.
6. When live work must be carried out on low-voltage equipment, it must be approved by the leader and supervised by a special person. When working, wear a work hat, wear long-sleeved clothes, wear insulated gloves, wear insulated shoes, use tools with insulating handles, and stand on the insulating mat, the adjacent phase live part and the grounding metal part should be separated by an insulating board, and it is strictly forbidden to use files, steel rulers, etc.
7. At the end of each maintenance, all tools and parts must be counted to prevent accidents caused by loss and left in the equipment.
8. The knife switch of the power distribution box is forbidden to be pulled away with load.
9. When loading and unloading the fuse with electricity, wear protective glasses and insulating gloves, use insulating clamps if necessary, and stand on the insulating pad.
10. The capacity of the fuse should be adapted to the equipment and line installation capacity.
11. The metal shell of electrical equipment must be grounded, and the grounding wire must meet the standard, and the electrical equipment is not allowed to disconnect the grounding wire of the shell.
12. Power switchboards, distribution boxes, switches, transformers and other electrical equipment are not allowed to pile up all kinds of flammable, explosive, wet and other items that affect the operation.
13. When using a ladder, the angle between the ladder and the ground should be 60 degrees, and it is not allowed to be elevated. When using the ladder on the sliding ground, there should be anti-slip measures, the ladder without hook should be held by someone at work, and the pull rope must be firm when using the herringbone ladder.
14. When using power tools, wear insulated gloves and stand on an insulating mat to work.
15. When a fire occurs in electrical equipment, the power supply should be cut off immediately, and carbon dioxide should be used to extinguish the fire, and it is strictly forbidden to extinguish the fire with water.
How to do a good job in the safety management of power distribution room and temporary electricity use? See below
Distribution room safety management system
Safety management system for power distribution rooms
1. The power distribution room should do a good job of lightning protection, rain protection, fire prevention, small animal prevention and other "four prevention" work, pay attention to close the doors and windows at will, and often check the protection of protective nets and sealing strips.
2. The power distribution room should be fully equipped with fire-fighting equipment and insulating appliances, placed neatly, and regularly inspected to keep it effective and intact; Managers are proficient in the use of fire-fighting equipment.
3. The operation of power distribution equipment should be carried out by professionals in strict accordance with the operating procedures, and other personnel present should only be supervised and should not interfere; It is strictly forbidden for two people to operate at the same time to avoid accidents.
4.Smoking is strictly prohibited in the distribution room, and it is strictly forbidden to bring flammable and explosive dangerous goods into the distribution room.
5.Maintenance personnel or other personnel need to enter the power distribution room, and they must be approved by the management before entering.
6. Management personnel should frequently check the operation of facilities and equipment, find hidden dangers, and arrange professionals to deal with them in a timely manner to ensure normal and safe power supply.
7. The management personnel should keep the floor, window sill and equipment appearance of the power distribution room clean and dust-free.
Safety operation procedures for power distribution rooms
1. The management personnel of the power distribution room should adhere to the weekly inspection system, find small faults or hidden dangers, and arrange professionals to deal with the live operation in a timely manner. If there is a major failure or a major hidden danger is found, emergency measures should be taken, and professionals should be contacted as soon as possible, and solutions should be formulated and dealt with in a timely manner.
2. When the low-voltage equipment is working live, a special person should be set up to supervise it. Wear insulated gloves, wear insulated shoes, use tools with insulated handles, and stand on dry insulation to work. The adjacent live parts should be separated by insulating sheets. It is strictly forbidden to use files, metal rulers, brushes and dusters with metal objects.
3. The power failure brake must be operated in the order of circuit breaker (or load switch, etc.), load side knife switch, and bus side knife switch.
4. After the power failure of electrical equipment, before opening the knife switch and taking safety measures, it should be regarded as having electricity and should not touch the equipment to prevent sudden calls.
5. In the event of a power failure, the power supply of each circuit must be cut off. The transformer and the voltage transformer must be disconnected from both sides of the high and low voltage of the voltage transformer.
The primary and secondary fuses should be removed. The operating power supply of the circuit breaker should be disconnected. The operating handle of the knife switch should be locked.
6. In the event of personal electric shock accident and fire accident, the personnel on duty should immediately disconnect the power supply of the relevant equipment for rescue.
7. When a fire occurs in electrical equipment, it should be extinguished with a carbon dioxide fire extinguisher or a 1211 fire extinguisher. Transformers** can only be extinguished with foam fire extinguishers after all power outages.
Safety operation procedures for electricians on duty in power distribution
1. The electrician on duty must abide by the general regulations of the electrical industry, be familiar with the performance and operation methods of various equipment in the power supply system and distribution room, and have the ability to take measures in abnormal situations.
2. Electricians on duty are strictly forbidden to leave their posts, and must strictly implement the on-duty inspection system, the reverse gate operation system, the work operation system, the traffic system, the safety equipment and fire-fighting equipment use management system and the access system and other system regulations.
3. The high-voltage substation and distribution room on duty must comply with the operation regulations of the high-voltage distribution device.
4. Regardless of whether the high-voltage equipment is energized or not, the personnel on duty shall not move or work over the fence alone. If necessary, a guardian must be present when removing the fence and at a safe distance when the device is not powered off.
5. When it is necessary to inspect outdoor high-voltage equipment during thunderstorms, you should wear insulated boots and do not approach lightning arresters and lightning rods.
6. Inspect the power distribution device, enter and exit the high-voltage room, and must close the door with hand.
7. When contacting the power supply unit or user (dispatcher) to stop and reverse, the person in charge on duty must recite and check the contact content and the name of the contact person and make a record.
8. The operation of power failure must be operated in the order of vacuum switch (or load switch, etc.), load side knife switch, and bus side knife switch, and the order of power transmission and closing is reversed. Strictly prevent the load from pulling the brake.
9 The reverse operation on the high-voltage equipment and the high-capacity low-pressure main plate must be performed by two people, and the one who is more familiar with the equipment shall act as the supervisor. Remotely controlled or wall-operated vacuum switches and knife switches (and vacuum switches with interlocking devices) can be operated by a single person. Allowing individual inspections of high-voltage equipment and personnel serving as guardians must be approved by the head of the equipment power department.
10. Wear protective glasses and insulating gloves when pulling the high-voltage knife switch with an insulating rod or pulling the high-voltage knife switch through the transmission mechanism. When operating outdoor high-voltage equipment in rainy days, the insulating rod should have a rainproof cover, and you should also wear insulated shoes to stand on the insulated platform. It is forbidden to reverse the operation in the event of lightning.
11. When loading and unloading the high-voltage fuse, wear protective glasses and insulating gloves, use insulating clamps if necessary, and stand on an insulating mat or insulating table.
12. After the power failure of electrical equipment, it should be regarded as having power before the brake is pulled and safety measures are taken, and the equipment and the fence should not be touched to prevent sudden calls.
13. When construction and maintenance require power outage or partial power outage, the personnel on duty should take safety measures in accordance with the requirements of the work ticket, including power outage, power inspection, installation of temporary grounding wires, switch locks, installation of fences and hanging warning signs, and on-site inspection and confirmation of no power with the person in charge of the work, and explain the location and precautions of nearby live equipment, and then both parties apply for permits to start work before they can start work.
14. At the end of the work, the staff is evacuated, and the person in charge of the work should explain it clearly to the staff on duty, and jointly inspect it, and both parties apply for a visa for the end of the work, and then the staff on duty can remove the safety measures and resume power transmission. It is strictly forbidden to temporarily stop and transmit electricity. Before the end of the work procedures, the personnel on duty are not allowed to close the construction equipment and send power.
15. When the high-voltage equipment is in power failure, the distance from the normal range of activities of the staff is less than the safety distance specified in Table 13-3 (see "Interior Line Installation Electrician") The equipment must be powered off, and the distance is greater than Table 13-3 but less than the safety distance specified in Table 13-1 The equipment must be equipped with a firm temporary fence at the distance from the live part not less than the distance of Table 13-3, otherwise the power must be cut off. The live part must also be blacked out if it is behind or on both sides of the worker and there is no reliable measure.
16. When the power is out, it is necessary to cut off the power supply that may come from each circuit, and the work must not only be carried out by pulling the circuit breaker, but must open the isolation knife switch, close the grounding knife, and hang the sign of "someone is working, it is strictly forbidden to close", so that each circuit has at least one obvious disconnection point. The transformer must be disconnected from the voltage transformer from both high and low voltages. voltage transformer.
The fuses on the primary and secondary sides should be removed. The operating power supply of the circuit breaker should be disconnected. The operating handle of the knife switch should be locked.
Live. 17. The electroscope must be a qualified product, and it must be suitable for the voltage level, and the power inspection must be carried out on both sides of the inlet and outlet lines of the maintenance equipment. Before the electrical test, the test should be carried out on the electrical equipment to prove that the electroscope is good. Insulated gloves must be worn for electrical testing with high-voltage equipment.
18. When it is verified that the equipment has no voltage, the conductors of the maintenance equipment should be grounded immediately and short-circuited to each other. Grounding wires are installed in each circuit that may be transmitted to the power outage equipment or in the part that may generate induced voltage. The grounding wire shall be multi-strand bare soft copper wire, and the cross-sectional area shall not be less than 25 square millimeters. The grounding wire must be fixed on the conductor with a special wire clamp, and it is strictly forbidden to use the winding method for grounding and short circuiting. When installing the grounding wire, the grounding end must be connected first, and then the conductor end, and the order of removal is reversed. The assembly and dismantling work must be carried out by two people. Maintenance personnel are not allowed to assemble and disassemble and change the grounding wire by themselves. The grounding wire should be numbered and placed in a fixed place. The assembly and disassembly of the grounding wire should be recorded, and the first time to explain clearly.
19 When working on the capacitor bank circuit, the capacitors must be discharged to ground one by one.
20. Warning signs of "no closing, someone working" should be hung on the operating handles of circuit breakers and knife switches that can be powered to the work place once closed. Warning signs of "Stop, High Voltage Danger" should be hung on the live equipment fences on both sides and opposite of the work place and on the aisles where traffic is prohibited. The workplace should have a warning sign that says "Work Here".
21. Patrol near low-voltage live equipment, and when inspecting, a safe distance must be met and a special person must be set up to supervise it. Energized equipment can only be in front of or on one side of the staff, otherwise it should be carried out without power.
22. When working on the secondary circuit of the live current transformer, it is necessary to strictly prevent the high voltage generated by the open circuit on the secondary side of the current transformer. When disconnecting the current circuit, it is necessary to use a short circuit piece or a short circuit to short-circuit the dedicated terminal on the secondary side of the current transformer. It is strictly forbidden to wrap the wire. The permanent grounding point of the circuit must not be disconnected during work. When working, there must be a special person to supervise, should use insulating tools, and stand on the insulating mat.
23. In the event of an electric shock accident or a fire accident, the personnel on duty shall immediately disconnect the power supply of the relevant equipment according to the operating procedures without permission to facilitate rescue, but must immediately report to the superior afterwards and make a record.
24 In the event of a fire in electrical equipment, a carbon dioxide fire extinguisher or 1211 fire extinguisher should be used to extinguish the fire. When a transformer catches fire, it can only be extinguished with a foam fire extinguisher after all the surrounding power has been cut off. Mesh fences should be added at the entrances of the doors and windows of the distribution room and cable trenches to prevent small animals from entering. Electrical