【 Weak current College 】 safe use of electricity and lightning-building--the first section of the safe use of electricity

Safe use of electricity is electricity and electrical operation, ensure human safety and equipment safety. Only the strict implementation of the relevant technical specification for safety, in order to avoid accidents and damage to the device.
This section from the safe use of electricity of common sense, describes common electrical shock, electric shock accident occurred when the first aid measures should be taken. 　　By learning how to deal with the risk of electric shock, current on human damage factors, common safety measures for electricity, electric shock accident occurred when the appropriate first aid measures should be taken. A common way of getting an electric shock, electric shock accident is diverse, mostly due to direct contact with the human body or charged body is equipment failure, or in the body is too close to the charged body, etc. In accordance with human touch charged body approaches and current passes through the body, electric shock can be divided into single phase electric shock, two-phase electrocution and causition. ① single-phase electric shock is the human touch a phase charged body of electric shock accident. In the three-phase four-wire power circuit in the human body is 220V of voltage. ② two-phase electric shock is the body's two simultaneous touches the two-phase charged body of electric shock accident. In the three-phase four-wire power circuit in the human body is the line voltage 380V. Therefore two phase electric shock than single phase electric shock. ③ causition is current through the nearby by human feet between the shock caused by step voltage. 　　The role of human being stepped voltage, electric current from one foot after the hip to the other foot and ground looped from high pressure bonding closer the potential is high. Second, current on human injury due to the human body is electrical conductor, so when human contact with live parts which constitute the current loop, it will have the current flows through the human body. Current flows through the human body can cause to the body of varying degrees of damage. Light only in the human body contact surface has a minor injury, and then the body's breathing, heart and nervous system causing serious injury until death. Current extent of harm to human health and the following factors. ① passes through the body of the current value. ② the human resistance values. ③ current passes through the body the length of time. ④ current flows through the human body. ⑤ current frequency. 　　⑥ voltage electric shock. General considers that the current passes through the body by the heart and lungs and the risk of central nervous system, with the risk of electric current passes through the heart to maximum. Therefore, according to the current through the way to differentiate the danger level, first of all from the hand to foot the most dangerous of the current channel. Because of the way to more current through the heart, lungs and spinal cord, and other vital organs; the second is from a hand to the other's current approach; the third is from one foot to the other foot in the current path.　　But the latter vulnerable to violent spasms and fell, causing the current through the body, causing hurt, drops, and other serious second accident. Usually electrical equipment using frequency (50Hz) alternating current, this to human security is the most dangerous frequencies. In addition, human health, the sensitivity of the current and potential hazards of the same degree.　　Where people with heart, nervous system diseases and tuberculosis, the degree of harm by electric shocks are relatively heavy. III. common safety measures for electricity electric shock accident in spite of all kinds, but the most common is accidentally touched in normal circumstances not charged and accidental live conductors. Electric shock accident while having the sudden, but has certain laws, as long as you are able to master the law to take appropriate security measures, many can be avoided.

To prevent electric shock accident of main technical measures, adopt voltage safety, ensure that electrical equipment insulation performance, sequestering, taken to ensure safety distance, rational use of electrical installations, fitted with leakage protection and protection earthing, zeroing devices, etc.　　IV. first aid for shock first aid for shock: one is to rescue quickly, the second is the knack of ambulance, persist. When an electric shock, the first electric shock ' should be made as soon as possible out of power, the self-help or each other. Whether self-help or aid must remain calm, method is to cut off the power immediately, or no conductive objects such as dry sticks, bamboo rod or a dry cloth and other materials to users as soon as possible from electric shock power. Ambulance to avoid direct contact with an electric shock the wounded, prevent electric shock and impact of the rescue work.

Electric shock, from power supply must be based on the actual situation of medical treatment immediately.　　Focus should note the ambulance would not be able to get a shock, coma, no breathing, no heartbeat as death by electric shock to the whole body, only cold and dead spots or dilated, with strong light stimulation (irradiation) eyes, the pupil does not shrink to conclude that the death, but should be judged by the doctor, it still must adhere to the rescue. If ' no loss of consciousness or loss of consciousness, but breathe exists, should be a shock to carry to ventilate static lay, sent hand guard, and requests the doctor, take the appropriate medical measures.
If ' no breathing or heart beat, or even both, full stop, should use mouth-to-mouth method and chest heart extrusion method. ① mouth-to-mouth method. Save time by one person, using one hand squeeze the nostrils, broke open, on the mouth inflatable to breathe and relax nostrils the breath, 12 times per minute, such as opening, and make not blowing the nose or, on the child of this method is not too excessive gassing. ② chest heart extrusion method. Ambulance hands overlapped, webs root on electric shock by two milk under point between is slightly slap root down pressure 3 ~ 4cm, around 60 times per minute, each time after Palm quickly relax extrusion.