Is it possible to completely avoid electric shock by installing a leakage switch? Why?

It depends on whether the leakage current protector (also known as residual current protector) is operating normally.

A leakage protector (leakage protection switch) is an electrical safety device. The leakage protector is installed in the low-voltage circuit, and when leakage and electric shock occur, and the action current value limited by the protector is reached, the power supply will be automatically disconnected within a limited time for protection.

Generally, the setting value of the residual current protector of the branch is 30mA, the instantaneous type, the bus will be set to 100mA, the selective type, the action time is slightly longer, the instantaneous type is less than 100ms, and the selective type is 130ms and 500ms (refer to the technical parameters of ABB residual current protector).

In addition, it is necessary to understand that the electric shock current and time of the human body are related to the current (i) that causes ventricular fibrillation not only to be related to the current (i) passing through the human body, but also to the time (t) that the current lasts in the human body, that is, it is determined by the safe amount of electricity through the human body q=i t, which is generally 50mA·s. That is, when the current is not more than 50mA and the current duration is within LS, ventricular fibrillation generally does not occur. However, if 50 mA/s is controlled, there is still a risk of ventricular fibrillation when the energizing time is short and the current is large (e.g., 500 mA).

Although less than 50 mA·s does not cause death due to electrocution, it can also cause the person to lose consciousness or have a secondary injury accident. It has been proved in practice that the operation characteristics of 30 mA·s as an electric shock protection device are more suitable in terms of safety in use and manufacturing, and the safety rate is twice as high as that of 50 mA·s (k=50 30=). From the safety limit of "30mA·s", it can be seen that even if the current reaches 100mA, as long as the leakage protector acts and cuts off the power supply, the human body will not cause fatal danger.

Therefore, the limit value of 30mA·s has also become the basis for the selection of leakage protector products.

Therefore, if the leakage protection is operated normally, it is generally not dangerous. But if the leakage current is too large, it is dangerous, but household electricity will not have such a large leakage current.

The following is a little bit more meaningful.。。。

Leakage cannot be completely avoided, and leakage switches allow weak leakage currents to pass through. However, it minimizes the risk of electrocution.

With the popularization of household appliances, the number of electrical appliances used in each household is increasing, under the premise of ensuring the safety of electricity, generally in accordance with the leakage protection device at the incoming line, however, some areas do not have such measures, and the leakage protector is not installed, which increases the risk factor of electricity. In the absence of leakage protectors, special attention should be paid to the safety of electricity, wet hands should not touch the area, install noisy ground wires, use a meter or electric pen to measure whether the electrical shell is live before using electricity, take good care of children, do not touch electrical equipment, etc.

Summary. It is okay to install only one leakage switch, but it is not very suitable. Now the leakage switch also has the function of preventing overload and short circuit, so the independent air opening is of little significance, but there is only one leakage switch, the leakage current is too large, the protection is not strong, the leakage current is small, and it is easy to trip sensitively, affecting the normal electricity consumption.

Therefore, the general control is open empty, and then each branch (especially in the bathroom and other places that are prone to leakage) must use leakage protection. But if the home decoration is simple, it can be less complicated.

It is okay to install only one leakage switch, but it is not very suitable. Now the leakage switch also has the function of preventing overload and short circuit, so the independent air opening is of little significance, but the town hole is only one leakage switch, the leakage current is too large, the protection is not strong, the leakage current is small, it is easy to trip sensitively, and it affects the normal electricity consumption. Therefore, the general control is that the royal belt is dry and empty, and then each branch (especially in the bathroom and other places that are prone to leakage) must be leaked.

But if the home decoration is simple, it can also be less complicated.

Water from the shower entering the socket can be either a short circuit or a leakage. (Short circuit is fire, zero on; Leakage is the connection between the live wire and the ground wire or the earth) in the general situation, first jump the leakage protection, because the water itself is not conductive, but the water is unavoidable to avoid impurities, so there are different degrees of conductivity, and leakage will generally be formed. A small amount of water in the socket is a short circuit.

In life, the round grip will generally skip the insurance will jump, and the empty opening may not necessarily jump).

Hello Kiss is happy to answer this question for you. The installation of leakage protectors is a basic security measure and a safety technical measure. The installation of leakage protectors is a preventive project to prevent electrical accidents, so it should belong to the category of preventive safety technical measures in terms of safety.

The installation of leakage protectors is a safety technical measure (basic security measures). Leakage protector, referred to as leakage switch, also known as leakage circuit breaker, is mainly used in the event of leakage failure of equipment and personal electric shock protection with fatal danger, with overload and short circuit protection functions, can be used to protect the overload and short circuit of the line or motor, and can also be used as an infrequent conversion start of the line under normal circumstances. Leakage protector can be classified according to its protection function, structural characteristics, installation mode, operation mode, number of poles and wires, action sensitivity, etc., here it is mainly described according to its protection function and use, which can generally be divided into three types: leakage protection relay, leakage protection switch and leakage protection socket.

1. Leakage protection relay refers to a leakage protection device that has the function of detecting and judging the leakage current, but does not have the function of cutting off and connecting the main circuit. The leakage protection relay consists of a zero sequence transformer, a trip device and an auxiliary contact for the output signal. 2. Leakage protection switch refers to the switch element that not only can connect or disconnect the main circuit like other circuit breakers, but also has the function of detecting and judging the leakage current.

3. Leakage protection socket refers to the power socket that has the ability to detect and judge the leakage current and cut off the circuit. Its rated current is generally below 20A, the leakage action current is 6 30mA, and the sensitivity is high, and it is often used in the protection of hand-held power tools and mobile electrical equipment and civil places such as homes and schools.

To add leakage protection see "Civil Regulations" 7 7 10 The setting of residual current action protection shall comply with the following provisions: 1 The distribution line of the following equipment shall be provided with residual current action protection: 1) hand-held and mobile electrical equipment; 2) Electrical equipment in outdoor workplaces; 3) Electrical equipment in particularly harsh or humid places;

It is necessary to add, especially when using mobile devices, leakage protection is a must.