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Zhongshan tuohao electric appliance co. LTD| How much electricity is harmful to human body? | ||||
| Publisher:admin | Add time：2018/11/3 | Viewed：177 | ||
| The minimum electric current that can be felt by people is called the sensing current. The ac value is 1mA and the dc value is 5mA. The maximum current that a person can get rid of after being electrocuted is called the escape current. The ac current is 10mA, and the dc current is 50mA. In a short period of time life-threatening current is called lethal current, such as 100mA current through the human body 1s, can be enough to make people fatal, in the case of protection against electric shock device, the human body can be allowed to pass the current generally can be considered as 30mA. & have spent < br / > The body's response to electricity :& NBSP; < br / > The hands have difficulty getting rid of the electrodes and experience acute pain (in the knuckles). < br / > The hands were rapidly paralyzed, the electrodes could not be removed automatically, and breathing was difficult. < br / > 50~80mA dyspnea, atrial fibrillation begins. < br / > Respiratory paralysis 90~100mA, three seconds after the heart began to paralysis, stop beating. < br / > (1) body resistance: The body resistance is mainly the skin resistance, 0.05 ~ 0.2 mm thick skin cutin layer of the resistance being very high, dry skin, the body resistance is about 6 ~ 10 k Ω, even as high as 100 k Ω; But the corneous layer is easy to be destroyed, get rid of the cutin layer of skin resistance of about 800 ~ 1200 Ω; The resistance of the internal organization of about 500 ~ 800 Ω. < br / > (2) shock voltage: The higher the voltage, the greater the risk automatic plug-in line, woolen sweater factory, tianjin car rental, pipe bender, LED wall lamp shell, tianjin discount air tickets, brand underwear,. The human body is in danger of passing more than 10mA of electricity. Therefore, to make through the body of the current is less than 10 ma, calculate by 1200 Ω if human body resistance, according to the ohm's law: U = 0.01 x 1200 = 12 v = IR. If the voltage is less than 12V, the shock voltage is less than 12V and the current is less than 10mA, the human body is safe. China's regulations: especially wet, easy to conduct electricity, 12V for safety voltage. If the air is dry and conditions are good, a voltage of 24V or 36V is available. Generally, 12V, 24V and 36V are the three levels of safety voltage. < br / > (3) shock time: the longer the shock time, the more serious the consequences. The relationship between the shock current and time is: the milliampere times the duration of the current, expressed as mA·s. China stipulates that 50mA·s is the safe value. If you exceed that, you're doing harm to the human body. < br / > (4) the location and health status of the shock: when passing through the heart, the harm degree is greater; When it passes through the brain, it causes an immediate coma. Heart disease, endocrine disorders, lung disease, mental illness, in the same circumstances, the risk is greater. < br / > So why is it that every household is equipped with a small circuit breaker (the leakage action current is generally 30mA) and a leakage protection plug is installed on the electric water heater (or other appliances that may have leakage)? Because the general household leakage protection plug leakage action current is 6mA or 10mA; It is more sensitive and safer than small short-circuiter with leakage action current of 30mA. It is especially effective and safe for children and the elderly. < br / > | ||||
