Since electricity began to be used in lighting, there have been classifications of incandescent lamps, fluorescent lamps, iodine-tungsten lamps, high-pressure mercury lamps, low-pressure mercury lamps, and LED lights. This has greatly increased the number of types of lighting lamps, as well as the luminous rate and service life. At the same time, with the development of technology, the color rendering performance of lighting lamps has also been greatly improved. However, the types of indoor circuit faults have also increased .
Next, I will share with you some indoor lighting circuit failure problems and related maintenance techniques.

Short circuit fault and maintenance

The cause of short circuit in indoor circuits is mostly caused by excessive current. Once the fuse cannot be blown in time, it may burn out the wires and other electrical equipment, and even cause a fire in serious cases. Short circuits can generally be divided into two different types: phase-to-phase short circuit and phase-to-ground short circuit. The latter also includes short circuit between phase line and neutral line and short circuit between phase line and earth.The main causes of short circuit include:

  • Wiring error, caused by contact between phase line and neutral line
  • Poor wiring or loose contact at the joint
  • The plug is not installed according to the design requirements, but the wire end is inserted into the hole, causing wire mixing
  • The insulation layer or insulation resistance inside the electrical appliance is damaged, resulting in contact with the metal shell
  • Water leakage in the house causes moisture or water in the lamp holder or switch
  • The wire insulation is damaged due to external force, and the damaged area is in contact with the power line or the ground

Maintenance of short circuit fault:

When checking and troubleshooting a short circuit, you must first cut off power to the electrical equipment in the fault area, and then observe the troubleshooting. If the fault cannot be ruled out, check the switch and corresponding protection devices. In addition, maintenance of aging wire insulation should also be done. Reasons for insulation aging include:

  • Pipeline lines and sheathed lines are prone to insulation aging due to factors such as leakage or overload on the lines that cause the wires to be overloaded for a long time
  • External mechanical damage causes the insulation layer of the wire to be destroyed. In order to prevent the occurrence of faults caused by this problem, the insulation resistance of the wires and the structure of the insulation layer should be checked regularly and irregularly. Once the insulation resistance is reduced or the insulation layer is cracked, it must be replaced in time to ensure the safety of electricity
  • Check the fuse wire. Remember that the fuse wire cannot be too thick, and do not use copper wire, aluminum wire, or iron wire, otherwise there is also the risk of short circuit.

Circuit breakage and maintenance:

Cause of circuit breakage:
A circuit break will also limit the normal operation of the line. Causes of circuit breakage include:

  • Loose or falling off wire connections
  • The mouse bites off the small-section wire
  • The wire breaks under the action of external force, which may be caused by mechanical pulling
  • Small cross-section wires are burned due to long-term overload or short circuit
  • The single-strand small-section wires are of poor quality or damaged during installation, which affects the normal function of the core wires in the insulation layer
  • The connecting lines of the movable parts are damaged due to overuse

Maintenance of circuit breakage:
When inspecting and repairing line break faults, we should adhere to the purpose of inspection step by step and slowly narrow down the fault point to ensure the safety of inspection and treatment. The general inspection steps are: Make sure the fuse in the fuse is in a blown state. If it is blown, then check the short circuit or load condition in the circuit; if the fuse is not blown and the phase line on the power supply side is not connected to the power supply, proceed to the previous step immediately. Check the level fuse. If it is also found that the fuse is not broken, go to the switch and circuit inspection on the distribution board (board). Through the above troubleshooting methods, determine the cause of the fault and take corresponding measures to restore smoothness of the line.

Heating failure and maintenance:

Cause of heating failure:
When wire heating or wire connection position heating occurs in indoor circuits, the more common fault factors include:

  • The specifications of the wire used do not meet the technical requirements of the design. When its cross-section is small, it will cause the wire to heat up due to overload
  • When the capacity of electrical equipment increases beyond the conductor load, but the line conductor area does not increase accordingly, heating will also occur
  • Lines, equipment and various devices have leakage problems
  • Heating will occur when a single current-carrying wire passes through magnetic metal such as steel pipes
  • The connection position of the wire is loose or loose, which increases the contact resistance and causes heating

Maintenance of heating failure:
There are many problems with heating faults, but they are all easy to troubleshoot and find. Usually the factors that cause the fault are not complicated. As long as the heat source is found, it is easy to eliminate.

All in all,
Fault analysis and maintenance of indoor lighting circuits are particularly important. Only by mastering the causes of indoor lighting circuit failures and corresponding maintenance methods can we take corresponding measures to troubleshoot and provide guarantee for safe use of electricity.

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