Radiation, any electrical appliances and electrical equipment have radiation, distribution box if the qualified power supply company design, according to the national law design, radiation is relatively small, harmless to the human body.
The distribution box has a small size, easy to install, special technical performance, fixed location, unique configuration features, not subject to site restrictions, the application is more common, stable and reliable operation, high space utilization, occupies an area of less and has the characteristics of the environmental effect.
Classification
1, the first level of power distribution equipment, collectively known as the power distribution center. They are centrally installed in the enterprise's substation, the power distribution to different locations of the lower level of power distribution equipment. This level of equipment relies only on step-down transformers, so the electrical parameters required are higher, and the output circuit capacity is also larger.
2, the second level of power distribution equipment, is the power distribution cabinet and motor control center collectively. Power distribution cabinets used in the load is more dispersed, circuit less occasions; motor control center for load concentration, circuit more occasions. They distribute the power of a circuit of the upper level distribution equipment to the nearest load. This level of equipment should provide protection, monitoring and control of the load.
3, the last level of power distribution equipment known as lighting power distribution box. They are far from the power supply center, is decentralized small capacity power distribution equipment.
Expanded
Distribution box according to the electrical wiring requirements of the switchgear, measuring instruments, protective appliances and auxiliary equipment assembled in a closed or semi-closed metal cabinets or panels, constituting a low-voltage distribution box. Normal operation with the help of manual or automatic switch to connect or break the circuit.
Failure or abnormal operation with the help of protective appliances to cut off the circuit or alarm. By measuring instruments can display various parameters in operation, but also can be adjusted for some electrical parameters, deviation from the normal state of work for prompting or signaling.
Construction power distribution system distribution box, switch box installation location should be reasonable. The total distribution box should be as close as possible to the transformer or external power supply, so that the introduction of power. Sub-distribution box should be installed in the center of the relative concentration of power equipment or load, to ensure that the three-phase load balance. The switch box should be installed as close as possible to the power equipment it controls depending on the site and working conditions.
Baidu Encyclopedia - Distribution Box
Baidu Encyclopedia - Substation Box