Answer: (1) according to the surrounding environment and the nature of production, the selection of suitable electrical installations;
(2) electrical installations shall not be overloaded operation;
(3) to ensure the quality of the installation and maintenance of electrical installations, so that it is in a good condition;
(4) electrical installations are prohibited from storing flammable and explosive substances near the device, and equipped with fire-fighting equipment;
(5) fire operations, you must apply for a fire permit.
From the safety point of view to understand why electrical equipment should be grounded?
A: From the safety point of view:
(1) Elimination of leakage. Electrical equipment, if the insulation of the energized part of the poor performance, it will be light to feel "numb hands", or injury. If grounded, leakage current from the ground to the earth, thus protecting personal safety;
(2) to avoid lightning strikes. Electrical equipment on the lightning arrester is a device to prevent lightning strikes, must be buried in the ground in order to lead the lightning to the ground;
(3) eliminate induction. Electrical equipment is subject to static induction, and if the enclosure is grounded, the induced charge can be safely conducted to earth.
Is it correct to say that it is not permissible to ground one part of the same distribution line and zero the other part of the equipment?
Answer: yes.18.
Which two conditions are present for electrical fires and explosions to occur?
Answer: (1) the presence of various flammable and explosive substances in the air of the premises;
(2) electrical installations in the production of ignition sources that cause fires and explosions.
Safety requirements for extinguishing fires in electrical equipment?
Answer: first try to cut off the power supply, the use of appropriate fire extinguishing machine, such as carbon dioxide, difluoro-monochloro-bromomethane, dry powder and other fire extinguishing machine.
What should be paid attention to when storing flammable and explosive materials?
Answer: the explosion, combustion hazardous items, etc. should be properly stored and managed according to the regulations, is strictly prohibited in the vicinity of smoking and open-flame operation. Special circumstances must be fire, should be strictly in accordance with the provisions of the report approved by the relevant departments.
When a fire occurs near the contact network to put out the fire. What matters should be noted?
Answer: (1) When a fire occurs in the vicinity of the contact network, you should immediately notify the train dispatcher or the contact network work area watchman.
(2) When using water or general fire extinguishers to extinguish objects less than 4 m away from the contact network, the contact network should be de-energized, and if sand is used, it can be done without power.
(3) in the distance from the contact network 4 m outside the object on fire, may not be blackout with a fire extinguisher, but the direction of the jet can not be to the contact network, and so that the water flow and the distance between the charged part of the distance of 2 m or more.
How to stop the burning of substances?
A: extinguish the fire is to stop the combustion of substances, to stop the combustion to eliminate combustion conditions, the methods are:
(1) asphyxiation: so that the burning area of the air around the concentration of oxygen is lower than the concentration of combustion to maintain the substance, or not at all make the oxygen into the combustion zone.
(2) isolation method: to restrict and stop the entry of combustible substances into the combustion zone, also includes the removal of combustible substances from the combustion zone.
(3) Cooling method: spraying water or other extinguishing agents on the burning material to bring it down below the spontaneous ignition point of the combustible material.
How do I use a carbon dioxide fire extinguisher?
A: Carbon dioxide fire extinguishers, there are two kinds of switch type and gate knife type. When using, first pull out the insurance pin, and then one hand to hold the wooden handle on the jet horn, one hand snap the duck tongue switch or rotary switch, and then lift and hold the body. Gate knife type once opened, the internal sealing copper wear through, that is, can not be closed, because it is generally only 2-3m jet distance, so in the jet, people should stand in the wind, as close as possible to the source of the fire, from the fire spread the most dangerous side of the spray, and then gradually move, do not leave sparks, the hand should be held in the spray canister wooden handle, so as to avoid frostbite, in the air is not fluent in the occasions, spraying After the air is not fluent, the spraying should be immediately ventilated.
What kind of work in a flammable and explosive workshop belongs to the fire operation?
Answer: (1) all work that can produce sparks.
(2) Installation of knife electrical switches.
(3) Installation of non-explosion-proof lamps.
(4) Knockout work with steel tools.
(5) Chiseling concrete floors and making eyelets in walls.
(6) Use of soldering iron, etc.
What are the fire protection requirements for electrical installations?
Answer:There are many reasons why electrical installations cause fires. Such as reduced insulation strength, wire overload, poor installation quality, equipment selection does not meet the fire requirements, equipment overheating, short circuit, mechanical damage, improper use and so on may cause a fire.
Requirements for the above reasons are:
(1) electrical devices to ensure that the insulation strength in line with the provisions of the insulation strength; limit the amount of conductor capacity, shall not be overloaded for a long time.
(2) Electrical devices should be installed in strict accordance with the installation standards, and the quality should be qualified.
(3) Select appropriate equipment according to the environmental conditions (e.g., humid, dusty, flammable, explosive, corrosive, etc.).
(4) Monitor the load frequently and do not overheat the equipment.
(5) Prevent short circuits due to mechanical damage, insulation damage, wiring errors, etc.
(6) Reasonable use of electrical devices according to their performance.
The contact points of wires or other conductors must be firm to prevent overheating and oxidation; when connecting copper and aluminum wires, attention should also be paid to preventing electrical corrosion; pay attention to checking the aluminum wire joints for corrosion and loosening or overheating. The process of generating static electricity to try to eliminate.