Mr. Chen, an outdoor household, has a solid color air conditioner. After installation, he stands barefoot on the marble floor and puts the copper valve on the outdoor unit of the air conditioner. When the indoor companion goes to the machine, he only hears Mr. Chen outside in a few minutes. A scream, then fell on the outdoor unit, never woke up.
09 pop song, barefoot into the bathroom, reach the hand of the electric water heater valve, intend to take a bath, but her hand just touched the valve, then fell to the side, waiting for the family to come back, found that she has returned to the West.
Needless to say, everyone has already understood that these two entries are caused by leakage of electrical appliances. The two meter boxes are equipped with leakage protection devices. Even if the electrical appliances leak, they should be quickly removed within 0.1 seconds of electric shock. Power, life-saving, but these two did not save them. Afterwards, the technical supervision department conducted an identification of the air conditioner, electric water heater and leakage protector of P, and the products conformed to the national standards. The two electric accidents were not caused by electric leakage, but the three-wire wiring in the three-hole power socket was not caused by the grounding.
Household appliances are becoming more popular, and the safety of electricity is also very helpful. Some electrical installations and users do not yet have basic electrical knowledge. Every year, many innocent people are killed, even though many new homes are now equipped with protective ground wires. Dummy, and even worse, the location of the pool-zero line is misconnected or connected, resulting in human-induced leakage of electricity. The above two cases are for this purpose. The single-phase leakage protector currently used can only protect the leakage caused by the power-hot line and the neutral line current and current imbalance, that is, the power supply wiring must be correct. However, in addition to electrical leakage in the electrical device itself, more is the use of electrical appliances, the power supply wiring is not correct, the connection is not reliable, and so on.
Nowadays, newly built houses are basically equipped with grounding wires in accordance with national standards/ground-line plastic skin ç ¬--yellow-green two-color, but the yellow-green "two-color ground wire is rarely seen during house construction or decoration. The grounding of the wire is unreliable and is ineffective. When the power plug of the electric appliance is plugged into the three-hole socket with the wrong position of fire, zero or ground, the metal casing of the electrical appliance (especially the metal liner of the electric water heater) is installed. When the user stands on the ground or hands on the electrical gold S shell, there is danger of electric shock.
After such a failure, the deceased's home and the technical supervision S department often think that the electrical leakage is caused before the technical appraisal is made.
At present, if the electric appliance itself leaks, the circuit-fire line and the neutral line current will be unbalanced, and the mutual-sense sampling and amplification will drive the leakage release action. Broken. For the class I, such as electric water heaters, air conditioners, electric tea stoves, etc., the frequency of the power supply is reliable. Even if the electrical appliances leak, it will not happen. Risk of electric shock.
Then, what is the status quo of the ground wire? It is understood that although the construction department has set up the public-ground line in accordance with the regulations when building the building, these ground line signs are not clear, and even the pool is not S, the essence can not be achieved. The role of the connection. Others mistakenly believe that the ground line is - the zero line 'puts the ground, and the zero I is connected together and is grounded. The hidden dangers buried by this will be at the expense of human life. 1 There is no other measure to prevent leakage of Class I appliances like electric water heaters. It can only rely on the ground wire. The author also understands that house decoration is the current fashion.
However, there are very few qualified electricians in the construction team. The wiring in the indoor socket is very irregular, as long as the light is on, the TV can do it.岂 岂 岂 , , , , , , , , , , , , , , , , , , , , , , , , , , 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除 排除
The wiring of the indoor three-hole power socket must be correct. It is strictly forbidden to connect the ground fire to the ground. If the leakage protector is installed, the output and input wiring should be correct. At least one leakage test button should be pressed once a month to check the leakage protection. Whether the device itself is reliable. Only by doing this can it ensure the safety of electricity.
The reasons for the non-self leakage of Class I electrical appliances are as follows: There are several kinds of outdoor power supply without pool line or pool line hanging. The user connects the ground wire to the fire wire in the three-hole power socket of the home, and the electric appliance itself does not leak electricity. However, in this case, the equipment is three-hole broadcast indoors, and the 7-inch gold-plated outer casing is filled with a gold-shell Z-shell or a metal liner.
The outdoor power supply has no ground wire or ground wire suspended, and the user's room has been laid with three wires. When wiring, the ground wire of the three-hole socket is connected to the neutral terminal, and the original ground terminal is empty. If the zero line is not connected, the appliance will be energized inside or outside the gold casing.
In the above two cases, no matter whether there is leakage or not, the leakage protector will not trip.
The outdoor power supply has a ground line or no pool line, or the pool line is floating, and the user mistakenly crosses the ground line and the zero line with L (fire) 丨 (Fig. Li fire) 丨 in the three-hole power socket, causing human leakage ( a).
The above two situations are extremely embarrassing, especially a. However, their leakage voltage is relatively low, and the danger is far less than the first and second cases.
There is no ground wire in the outdoor. The user mistakenly thinks that the pool line is the neutral line. The indoor three-hole power socket pool line terminal is connected with the neutral line terminal, causing human leakage, and the electric protector will not automatically trip at this time.
In the above cases, the leakage of electricity due to misconnection or double wire connection is caused by non-instrument.
(Edit this column: Wang Yuanmei)
(Finish)
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