Common home circuit failures
Common home circuit failures fall into four categories: open circuit, short circuit, overload and leakage, which also include additional scenarios such as poor line contact and faulty connections causing failures.
Open circuit is also known as the broken circuit, namely for the family circuit somewhere disconnect, such as wire connector disconnect, filament broken, although it will not constitute a direct injury, but will cause no current through the electrical appliances and unable to work normally. The fault can be detected with a test pen.
Short circuit means that the current does not pass through the electrical appliances and directly form a path, that is, the fire line and zero line direct connection.When the line is short-circuited, it is extremely harmful, and the large current generated is very easy to cause local high temperature of the line, damage the electrical appliances and even cause fire.Accidents caused by short circuits can be reduced by using suitable safety switch.
Overload means that the total power of electrical appliances in the circuit is too large or the power of a single electrical appliance is too large, and the resulting phenomenon and consequences are like short circuit. Even if the accident cannot be caused in the short term, it will accelerate the line aging and increase the probability of accident.
Leakage is the direct leakage of electricity into the ground without the use of electrical appliances.The reason is conductor outer layer or with the insulation performance of electric appliance drop, leakage of electricity can cause with electric appliance actual power drop, also can cause human body to get an electric shock. The use of leakage protector can prevent leakage. Often trip circuit, replaced with a new air switch, after a while still jump,sometimes it can be pushed up after trip circuit, and sometimes it will collapse when it is pushed up after tripping. The fault often occurs in rainy days with high humidity, and household appliances can not be used normally.
Such as lamp holder, switch, hanging box poor contact; poor contact of fuse; poor contact of line connector. In this way, the lamp will be on and off, and the electrical appliances can not work continuously.(the most common, commonly known as virtual fire fighting, will burn down household appliances and the source of potential fire hazards of household electrical appliances).
6.Circuit connection error
For example, the two terminals of the socket are all connected to the live wire or zero line; the switch is wrongly connected to the live wire in the main line; the bulbs are connected in series in the circuit,No ground wire in the socket of the water heater. The switch controls the zero line. When the lamp is turned off, the flicker occurs. when the ground wire of the zero line is reversed, the leakage switch will trip.
The main faults of household circuits are that the electrical appliances are not working and the fuse is blown. For the analysis of circuit fault, it is generally to determine whether the circuit is open or short circuit according to whether the fuse is blown.If the fuse is not broken, it may be the open circuit of the wire or the electrical appliance. At this time, the test pen can be used to detect whether the live wire is broken or the zero line is broken; if the fuse is blown, it may be caused by short circuit, overload or leakage.
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