Lamp lighting products are consumables, incandescent LED lights have a life cycle, the normal use of failure or other people for damage. Lamps can be replaced, but the line design is fixed. Considering the convenience of replacing lamps and maintenance in cable connection, the connection box or connection terminal solves this pain point. The connection box is different and the manual connection is complex, and the maintenance is inconvenient. First, the connection box is cheaper and the stability and safety are higher. In addition to special circumstances, switches, sockets and lamps must have wiring boxes. 
 
Reason 
 
1. Maintenance facilitation 
 
In the actual household electricity consumption, it can be said that the line fault caused by the joint bow | accounts for the majority. For example, the joint heating leads | the starting line is burned, and the joint is loose for a long time, resulting in poor contact. Therefore, it is necessary to assemble the connection box where there are joints, and the later ten thousand-fault is convenient for maintenance. 
 
2. Protective joints 
 
Switches, sockets, lamps and other joints if not using wiring boxes, if drip prone to leakage ; if dust is more likely to cause short circuit ; other organisms are prone to leakage, electric shock, etc. 
 
3. Flame retardant and insulation 
 
With the increase of use time, the switch, socket, lamps and other joints are easy to loose and heat, and the serious situation will cause combustion at the joint. Connection boxes are generally flame retardant, can effectively prevent the spread of fire. 
When exposed copper or insulation failure occurs at the connection, the connection box can effectively separate the exposed copper from the earth ( wall ) to prevent leakage. 
 
 
4. Accreditation
If the products are exported to other countries, the lighting lamps and lanterns need to be certified. The appearance and internal structure of the lighting lamps and lanterns products and the cables have corresponding requirements. Therefore, the cable wiring must be well protected, and the wiring box connector plays a protective role. 
 
 
 
Special circumstances 
 
 
 
In some more special cases, wiring boxes may not be used, such as lanterns on the ceiling or buried cable lines, as well as the line itself is small in space, or welded wiring.