In electrical circuits, a short circuit refers to the accidental contact of two or more metal lines, causing current to flow in an unintended path, thus forming a short circuit. This path is in the opposite direction to the supply voltage, causing a sharp increase in current in the circuit, which can cause overload or damage to the original power supply, and in severe cases cause a fire or an explosion.
Shorts in circuits usually cause the generation of heat and light, and even sparks or arcs. At the same time, this situation will also have adverse effects on various electronic devices, such as causing overheating, burning components, damaging internal circuits, etc. Short circuits can also endanger human life, as strong current and high heat can cause fires andexplosions.
To avoid short circuits, it is very important to follow current electrical safety standards and regulations when designing and installing circuits. Engineers should carefully inspect electrical equipment such as circuit boards, wires, components and connectors, paying attention to the reliability of materials and specifications. Protect circuits by maintaining sufficient space on the circuit board, connecting them correctly, and using appropriate fuses or circuit breakers. During the daily use of electrical equipment, you should also pay attention to regular inspection and maintenance, avoid using damaged or aging electrical components, and avoid using uncertified electronic components.
The two lines of the house are live wires, but the neutral wire is casese.
1. You can first check the switch box and check if the top and bottom ports of the air switch are missing. If the upper mouth is normal, the lower mouth is absent. You can then judge that the pneumatic switch is damaged and replace it. If the air switch is normal, please check whether the neutral wire of the socket and lamp port is connected normally.
2. The red lines are all live wires, and the pen will only light up when it detects live wires.
3. Familiarize yourself with the circuit conditions at home, whether the live wire is in the live wire position and whether the neutral wire is in the neutral position. Pay attention to electrical devices/switches that actually indicate which locations are connected to light or zero. There are national standards.
Difference of live wires
1. Distinguish by coColor: In the power cable, green and red represent phase A, phase B and phase C (three-phase live wire) respectively, blue represents neutral wire, and yellow green color represents ground wire .
2. Use an electric pen to distinguish: the neon tube will glow when you test the live wire with an electric pen, but not the neutral wire.
3. Use a voltmeter to distinguish: the voltage between different phase wires (that is, live wire) is the line voltage 380V, and the voltage between phase wires (live wire) and the neutral wire (or a good grounding body) is The phase voltage is 220 V and the voltage between the neutral line and a good ground is 0 V.