The common faults of the lighting circuit are mainly short circuit and open circuit (three states of the circuit: path, open circuit (open circuit), short circuit). Circuit breaker: The main causes of circuit breaker are fuse broken, loose wire, broken wire, switch is not connected, wire joint corrosion.

Incandescent light bulb: If one bulb (incandescent light principle) does not light and others light, should first check whether the filament is burned. If the filament is not burned off, you should check whether the switch and lamp cap contact is bad, there is no broken line and other faults. In order to check the fault point as soon as possible, the test pen can be used to measure the lamp base (lamp port) of the two levels of power, if the two levels are out of power (pen is not bright) that the phase line is off; If the two levels are bright, it means that the neutral line (zero line) break; If one is extremely bright and the other is not, the filament is not connected and broken (the bulb is faulty). If the filament burns out, the bulb is all that’s left, and in case of an emergency, the filament can still be used.

IS200TVIBH2BBB

IS200TVIBH2BBB

IS200TVIBH2BBB

Fluorescent lamp: if it is fluorescent lamp (fluorescent lamp (fluorescent lamp) working principle) lamp tube is not bright, in addition to check the line power off, should also be on the starter (located on the side of the lamp holder a long circular device, twist 90 degrees can be pulled out) for inspection, sometimes is the starter contact is bad, twist it. If it still does not work, then take down the lamp tube and change it to another lamp holder to try to see if the lamp tube is damaged. If there is no damage, check the starter using the same replacement method (use the starter on another fluorescent lamp that can be lit). If this still can not solve the problem, that is the fluorescent lamp ballast fault, this thing is installed in the lamp holder inside, when the replacement needs to be the fluorescent lamp tube, lamp holder are removed, some trouble, if it is the lamp ballast is broken, spend about 10 pieces to buy a new replacement. Fluorescent lamp holder at both ends of the contact may also occasionally appear poor contact, but this failure is rare.

Short circuit: The causes of short circuit are as follows:

Electrical appliances are not connected so well that the joints collide;
Lamp holder or switch water, screw lamp holder loose inside or top core skew met the screw, resulting in internal short circuit;
The insulation of the conductor is damaged or aged, and the insulation of the neutral line and the phase line are out of contact.

When a short circuit fault occurs, the phenomenon of electric spark will occur and cause the short circuit protection action (fuse burning or tripping). When a spark is found in a short circuit or a fuse is broken or tripped, check the fault point first. Try to solve the problem before switching on power.

In addition, leakage will also cause lighting line fault, phase line insulation damage and grounding, electrical equipment internal insulation damage to live shell and other reasons, will cause leakage. Leakage not only causes power waste, but also may cause personal electric shock accident. Now residents will install electric leakage, short circuit protection devices. When the leakage circuit exceeds the setting current value, the leakage protection device will cut off the circuit. Resulting in fluorescent lamps and other lighting equipment can not work.