What kind of leakage protector should be used in what occasion

It depends on the occasion and the type of electrical equipment. For example, there are three types of common loads: single-phase load, two-phase load, and three-phase load.

Single-phase load: For example, all kinds of household appliances, lighting, etc. belong to single-phase load; Two-phase loads, such as a welding machine with a 380-volt power supply, because its power supply is taken from two phase wires; Three-phase loads, such as three-phase asynchronous motors. According to the different loads, different voltage levels are selected, three-phase loads and two-phase loads can use three-phase three-wire leakage protectors, and single-phase loads can use single-phase leakage protectors; If there are both single-phase and three-phase electrical equipment in the circuit, a three-phase four-wire leakage protector can be selected.

Single-phase leakage protectors are generally 220 volts; Cannot be used in three-phase circuits. The underside of the three-phase four-wire leakage protector can be used with a single-phase load. According to the place of use, it is necessary to choose accordingly; For example, the leakage protector used in wet occasions should be used in a moisture-proof type; In places with ** and corrosive gases, explosion-proof type should be selected; For outdoor use, a leakage protector with rainproof measures should be selected.

The common leakage protector cannot be used in dangerous occasions; However, after the ordinary leakage protector is combined with the rainproof and dustproof distribution box, it can be used outdoors, and can also be used in workshops and other places with conductive dust.

In addition to the above, the most important thing is the rated voltage, rated current, and leakage action current and leakage action time. The rated voltage should be consistent with the rated voltage of the line and load. The rated current should be equal to or slightly greater than the load.

If the total leakage protector installed behind the incoming watt-hour meter, it should also be noted that it matches the rated maximum current of the watt-hour meter. In use, it is also necessary to pay attention to whether the leakage protector can break the short-circuit current, if not, it is necessary to add a fuse or air switch on the incoming side as a backup protection. Leakage action current selection:

For civil lighting, home appliances and office power supply circuits, the leakage protector with an action current of 30 mA and an action time of no more than seconds is selected; The electric shower selects an operating current of 6 10 mA, and the action time does not exceed seconds; For industrial equipment, when a single unit is protected, the action current of 30 50 mA can be selected, and the action time does not exceed seconds; Hand drills, electric taper changers, and other hand-held power tools should be selected 15 30 mAh, and the action time does not exceed the second leakage protector; The leakage protector installed in the distribution line to prevent the disaster caused by the grounding fault should be selected with a leakage protector of 100 500 mAh; In order to avoid the overstepping action of the upper and lower leakage protectors; For the leakage protector installed in the distribution line, the action time should be greater than that of the next level of leakage protector, and the delay action type can be selected.

The size of the leakage protector should be determined according to the size of the load on the equipment (not according to the occasion).

The total air switch (circuit breaker) or leakage protector (leakage circuit breaker) for low-voltage 220V household power distribution is matched and selected according to the capacity of the power supply (metering energy meter) provided by the power supply to the user, and if there is no power supply capacity limit, it is matched and selected according to the safe current carrying capacity of the power line entering the household.

The circuit breaker or leakage circuit breaker of each distribution line under the total circuit breaker or leakage circuit breaker shall select the distribution wire with the safe ampacity of the appropriate load power according to the approximate load power of each distribution line and leave a certain margin, and then the unipolar or unipolar +n or bipolar circuit breaker with the corresponding trip current value shall be installed at the beginning of the distribution line (loop) with different safety ampacities to protect the safety of the wire.

Answer: The specifications of household leakage protectors can be divided into 6 and 200, as well as 400A and other different specifications. Under normal circumstances, a 30mA leakage protector can be used in the home. However, the leakage protector with a leakage current of more than 50mA cannot be used as a leakage protection in the home.

If you choose too low a leakage protector, there will be some errors in the current value, which will also affect the normal use.

Generally, the leakage protector of ordinary families can choose 40A, because the maximum electricity consumption of ordinary families is 5 6 kilowatts, and the maximum current is about 30 amps, so you can choose 40 amps. If you are a wealthy family with a lot of air conditioners and appliances, you can choose 63A or 100A.

At present, the power supply of domestic home buildings with leakage protection function is about 40-50A. There are slight differences from place to place.

It should be calculated according to the power of the electrical equipment at home, and it should also depend on how big the main line enters your home, the cross-sectional area of copper wire, the general household air opening plus leakage protection, 40 amperes are more.

In life, it is very important to install a household leakage protector, which can protect the safety of household electricity. When there is a leakage situation in the home, the leakage protector will come in handy, and it will automatically power off to protect the home appliances. Many people don't know how big the leakage protector is to use at home, generally speaking, the household leakage protector is selected according to the power of different appliances, and the size of the household leakage protector used by different power appliances is different.

For example, the power of the electrical appliance is 4kw, then 4000 220 = 18a, the rated current of the leakage protector is required to be greater than the load current, under normal circumstances, the choice of the leakage protector is calculated according to the multiple of the load current, that is, 18A *, there is no 27A leakage protector in actual life, so the leakage protector should be selected 32A, which is more appropriate.

It is recommended to use a leakage protector with a rated action current value of 30mA, because in the home improvement circuit, the leakage protector can automatically trip when the road leaks or fails, and has the function of protection, so it is more appropriate to choose 30mA, if you choose a leakage protector of 50mA, the sensitivity is low and it is easy to misoperate.

Leakage action breaking time: according to Qeeka Home experts, this parameter refers to when the line fails, to the leakage protector detection and tripping time, in principle, the less time is of course, the better, but because the greater the current flowing through the human body, the greater the damage to the human body, so it is recommended to choose 30mA.

The action time of the leakage protection: the action time of the leakage protection withstand volt on the market is mainly divided into three types, one is the fast type, which requires the action time to not exceed, the second is the fixed time limit type, which requires the action time to not exceed 2 seconds, and the last one is the reverse time limit type, according to different action currents, the action time is also different.

Leakage protection does not operate current: when the line is running, the leakage protector has a permissible leakage current, within this range, the leakage protector will not act, which is a parameter that is easy for non-professionals to ignore, but it is actually very important to ensure the normal operation of the line and avoid false jumping.

Summary. The size of the household leakage protector is to be matched according to the load current at home, the main switch will use 2P40A or 2P63A leakage protector, of which the lighting circuit can choose 16-20A, the socket circuit can choose 20-25A, the kitchen and bathroom will choose 25A, if it is an air conditioner, water heater and other high-power electrical socket circuit, you should choose 30A, when choosing, to ensure that the leakage protector on the main switch is greater than any branch switch current load.

Hello 60a, I am a special guest answerer, and I have served more than 1,000 people. The size of the leakage protector for the main switch for the household is generally 60A, and the leakage protection of the wire circuit is generally 16A, 20A, 32A, for example, the 16A leakage switch is used for the home lighting circuit, and the 32A leakage switch can be used for the home air conditioning circuit, etc.

The size of the household leakage protector is to be matched according to the load current at home, the main switch will use 2P40A or 2P63A leakage protector, of which the lighting circuit can choose 16-20A, the socket circuit can choose 20-25A, the kitchen and bathroom will choose 25A, if it is an air conditioner, water heater and other high-power electrical socket circuit, you should choose 30A, when choosing, to ensure that the leakage protector on the main switch is greater than any branch switch current load.

1. It has different current sizes, and when choosing, you need to distinguish whether it is rated or action, if it is rated, there are generally 10 amps, 16 amps, 20 amps, 32 amps, 40 amps and so on. If it is an action current, it is commonly used to be amperes. For the leakage protector used in the family, it is almost the same as choosing 6 amps, 10 amps, and 16 amps, and try to choose the D type, and the starting current is slightly larger, you can choose 20 amps.

2. If your home is 3 bedrooms and 2 living rooms, one bedroom is required to have one circuit, and three bedrooms must have three circuits. Toilets, living rooms, and dining rooms need to have a circuit, and the lights in the living room and dining room can share a circuit.

3. You can choose a 1P circuit breaker for the lighting circuit, and a 2P circuit for the socket to prevent the light box from being large enough. For the circuit of the air conditioner, choose a current of 16 23. If there are more outlets, you can choose 20-25 amps.

If it is some socket switches with relatively large power, you can choose 25 32 amps and so on. If it is a lighting circuit, basically choose 6 10n consulting record · Answered on 2021-06-14

How to choose the size of the leakage protector? Thank you!

1. It has different current sizes, and when choosing, you need to distinguish whether it is rated or action, if it is rated, there are generally 10 amps, 16 amps, 20 amps, 32 amps, 40 amps and so on. If it is an action current, it is commonly used to be amperes. For the leakage protector used in the family, it is almost the same as choosing 6 amps, 10 amps, and 16 amps, and try to choose the D type, and the starting current is slightly larger, you can choose 20 amps.

2. If your home is 3 bedrooms and 2 living rooms, one bedroom is required to have one circuit, and three bedrooms must have three circuits. Toilets, living rooms, and dining rooms need to have a circuit, and the lights in the living room and dining room can share a circuit.

3. You can choose a 1P circuit breaker for the lighting circuit, and a 2P circuit for the socket to prevent the light box from being large enough. For the circuit of the air conditioner, choose a current of 16 23. If there are more outlets, you can choose 20-25 amps.

If it is some socket switches with relatively large power, you can choose 25 32 amps and so on. If it is a lighting circuit, basically choose 6 to 10N.

Household leakage protector should choose 32aIn household leakage protection, a high-sensitivity leakage protector with a leakage current of 3mA should be selected.

The low-sensitivity leakage protector of the 63A household leakage protector cannot be used as a household leakage protector, and it will malfunction and affect normal use.

Expand the judgment of slag and the age of relativesLeakage 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.

The household leakage protector 30mA is more suitable, and the leakage protector is recommended to be installed by professionals.

The leakage protector (referred to as leakage protection) is the same as the air switch (referred to as air open), but it has one more module with leakage protection function than the air open, not only the current will trip if it is excessive, but the leakage will also trip. Leakage means that the shell of the electrical appliance that should not be charged is electrified, and it is very dangerous for people to encounter it, so once leakage occurs, it is necessary to immediately cut off the power to ensure personal safety.

The general action current of the household leakage protector is 30mA, the human body's getting rid of the current is about 10mA, the size of the human body resistance is different, the general human body electric shock is different, and the resistance reflected by the human body is different.

Teach you a formula to calculate it yourself to know that you should have most of the missing insurance; Add up all the electrical appliances in the house, and after adding it, it is the total power" and "remove it with the total power to 220, which is equal to the current size. For example, if the total power is 5500 watts 220V=25A, then buy 25** if you miss the warranty.

If you have these appliances at home, you think it is enough to buy a 30 or 40 horse, and generally one p is the kind of independent switch.

Estimate the power load, buy an appropriate circuit breaker with leakage protector, the grounding value of the conventional leakage protector is 300mA.

Household electricity leakage.

The 30mA protector is more suitable, and the leakage source protector is not recommended to be installed by yourself, and it is recommended that a professional electrician install it.

The family leakage protector is generally selected according to different voltages, and the voltage of the protectors used by different electrical appliances is also different. The leakage protector mainly uses the residual current reaction and action of the system to power off. If the selection is large, the microcurrent leakage will not automatically cut off the power, and it will not play a protective role, and it will cause a fire after a long time.