电力安全常识Common sense of electric power safety.docx

1、电力安全常识Common sense of electric power safety电力安全常识（Common sense of electric power safety）Common sense of electric power safety1, when the electrical equipment fire occurs, what kinds of equipment can be electrified fire extinguishing?Answer: 1211 carbon dioxide, carbon tetrachloride dry powder (answe

2、r 2, count right)2, according to the frequency of electric shock accident, which month of the year is the most concentrated accident?Answer: 69 months3. How many volts is the maximum safety voltage?Answer: 42 Volts4, through the safety of the body, DC current provisions in the following?Answer: 50mA

3、5, through personal communication, safety current regulation in the following?Answer: 10mA6, electric shock emergency ambulance law, what should be the first? And what is going on right now?Answer: electric shock rescue; artificial respiration.7. How many kinds of protection devices are there to pre

4、vent direct lightning in our factory?Answer: lightning rod; lightning protection network; lightning eliminator.8, when the wire is grounded, the distance between the body and the ground is closer. The higher the step voltage is, the farther the distance is, and the lower the step voltage is. General

5、ly, the distance between the grounding body and the step voltage can be regarded as zero. A:10m within B:20m other than C:30mAnswer: B9, low voltage test pencil is generally applicable to AC and DC voltage (V).A:220 B:380 C:500Answer: C10, the construction site lighting facilities should be taken to

6、 prevent electric shock measures ().A: wear insulated gloves B: cut off the power C: stand on the insulation boardAnswer: B11, the electric shock can be rescued, the key lies in ()A: the way to get an electric shock B: the size of the body resistanceC: the level of the electric shock voltage D: can

7、you get out of the power as soon as possible and carry out emergency medical service?Answer: D12, the elimination of static electricity on the pipeline, mainly what to do?Answer: Ground13. What is called safe voltage?Answer: in different environments, human exposure to the charged body has certain v

8、oltage, its various parts (such as skin, heart, dirty, respiratory and nervous system) without any damage, the voltage called safe voltage.14, what are the main factors that affect the degree of injury to the human body?Answer: the main factors are: the size of the current, the body resistance, the

9、duration of the power, the frequency of the current, the level of voltage, the current path, the human condition.15 、 the motor in operation will start again after stopping. How many times can the thermal start be allowed in the hot state? How many times do you allow a continuous start in a cold con

10、dition?Answer: 1 times; 23 times16, the construction of electrical machinery and equipment should be taken as protective measures?Answer: protection must be used to connect zero and repeat ground.17, what are the two parts of the electrical safety measures?Answer: organizational measures and technic

11、al measures.18 、 What are the main methods of separating from low voltage power supply?Answer: (1) cut off the power supply; (2) cut off the power line; (3) pull the power cord;(4) pull out electric shock; (5) take corresponding rescue measures.To take the above measures, attention must be paid to t

12、he insulation tools according to the corresponding voltage level.19 、 what is the order of the isolation switches when the power is transmitted?Answer: first, after the bus side line side.Switch 20, power distribution box can be opened with a load.Answer: No.21 、 what kind of power tools must be use

13、d when using hand-held or mobile power tools in explosive and fire dangerous places?Answer: there are anti explosion measures.22 how many volts of safe voltage should be used in a wet workplace or in a metal container using portable electric appliances or lamps?Answer: 12V.23, the motor test machine

14、, you can move together, press the stop button immediately? Why?Answer: No. The starting current is 67 times the rated current, and the switch will burn out immediately.24, I plant most of the motors are explosion-proof motors, explosion-proof grade is generally what?Answer: dIIBT425, my factory exp

15、losion-proof motor, is not waterproof motor?Answer: No.26, when the process load does not reach the rated load, the motor will not overload, right? Why? Answer: No. Medium changes, pump failure, motor failure will lead to excessive load.27, why do not fire, temporary electricity ticket is not allowe

16、d to connect temporary electricity?Answer: temporary power belongs to the electricity spark, easy to cause safety accidents caused by electric shock, fire explosion, fire, temporary electricity must apply for tickets, take some security measures on the construction site, can connect temporary electr

17、icity.28, indoor lighting lines of electrical equipment, the total capacity of each circuit should not exceed kW, (1) 1; (2) 2; (3) 3.Answer: (2)29, the socket capacity should be compatible with the power load, each socket is allowed to use a few appliancesAnswer: 130, work place relative humidity i

18、s greater than 75%, then this work environment is vulnerable to electric shock environment: (1) danger; (2) particularly dangerous; (3) generalAnswer: (1)31, in order to prevent accidents caused by electrostatic sparks, all used to process, storage, transportation of a variety of flammable gas, liqu

19、id, powder equipment, metal pipes, non conductive materials pipe must(1) there is a large enough resistance; (2) there is a small enough resistance; (3) groundingThree32, power tools lead wire, in which the yellow green double color line should be used as a line. (1) phase; (2) work zero line; (3) p

20、rotective earthing.Answer: (3)33, the most effective measures to ensure the personal safety of electrical maintenance personnel are.(1) hanging nameplate; (2) placing barrier; (3) grounding and short-circuit of maintenance equipment. Answer: (3)34, from the security point of view, the equipment outa

21、ge must have an obvious - -.(1) sign: (2) grounding; (3) break point.Answer: (3)35, the equipment or lines of confirmation of no electricity, should be based on instructions.(1) the voltage meter (2); electroscopes; (3) disconnect signal.Answer: (2)36, distribution panel (box), switches, transformer

22、s and other electrical equipment may not be near. (1) set fire extinguishers; (2) set up fences;3) pile up inflammable, explosive, damp and other things that affect the operation.Answer: (3)37, general residential buildings, office space, if the main purpose of preventing electric shock, the use of

23、leakage action current of mA leakage protection switch.(1) 6; (2) 15; (3) 30.Answer: (3)38, mobile power tools and their switch board (box) power line must be adopted. (1) double plastic copper core insulation wire; (2) double stranded copper core plastic wire; (3) copper core rubber insulation or s

24、heath copper core PVC insulated PVC sheathed flexible cord.Answer: (3)39, mobile power tools, power cord lead length should not generally exceed meters. (1) 2; (2) 3; (3) 4.Answer: (2)40, long-term use of hand-held power tools, the use of insulation resistance must be measured, requiring I class han

25、d-held power tools, live parts and insulation resistance between the shell is not less than M. (1) 2; (2) 0.5; (3) 1.Answer; (2)41. What is a short circuit?Answer: short circuit is a phase line and phase line in the electric line, phase line and the zero line or the earth, not in collision by load o

26、r resistance is very small, resulting in a substantial increase in the electrical current loop phenomenon.42, what harm does short circuit have?A: the short circuit current causes the short circuit or even the whole circuit to overheat, and the insulating layer of the wire burns up and ignites the c

27、ombustible in the surrounding building.43, in moving fan, lighting and mobile welding machine and other electrical equipment, under what circumstances should be carried out?Answer: cut off the power supply.44, any electrical equipment shall be considered in check when there is no electricity, and no

28、t blind touch.Answer: there is electricity.45, 1kW iodine tungsten tube surface temperature of up to how many degrees? Answer: 500800 degrees celsius.46. Why is an incandescent lamp easy to break when turning on the light?Answer: filament cold, small resistance, just energized, the current is large

29、(about 10 times), long time, easy to bad.47, fluorescent two hair red not bright, you can continue running? Why?Answer: No. At this time the current is greater than the rated current, will cause (1) filament aging and damage quickly; (2) ballast temperature is too high, it will cause fire.48, the sa

30、me voltage alternating current and direct current, which one of the great harm to people?Answer: alternating current. Especially the alternating current of 5060Hz.49, electrical equipment fire, first of all, what measures must be taken? Answer: power failure.50, in the production process, equipment

31、maintenance fire shall not be temporary why in the cable trench near?Answer: in order to prevent the ditch memory has flammable gas cause deflagration.51, what happens in the operation of electrical equipment, the operator should take emergency measures to start the standby unit, stop abnormal units

32、, and notify the professional inspection process.A: (1) the load current suddenly exceeds the specified value or the phase of the phase is recognized;(2) the motor or switch suddenly appears high temperature or smoke;(3) the friction of the motor or other equipment due to the looseness of components causes noise or sparks;(4) serious mechanical load failure or endanger electrical safety.