The distribution box is an electrical equipment with the characteristics of small size, easy installation, special technical performance, fixed position, unique configuration function, no site restrictions, widespread application, stable and reliable operation, high space utilization rate, small land occupation, and environmental protection effect. The massive parameters on the data of the distribution box generally constitute a low-voltage forest. According to electrical wiring requirements, the switchgear, measuring instruments, protective appliances, and auxiliary equipment are assembled in enclosed or semi enclosed metal cabinets or screens to form a low-voltage distribution box. During normal operation, the circuit can be connected or disconnected using manual or automatic switches.
The purpose of the distribution box
The distribution box has the characteristics of small size, easy installation, special technical performance, fixed position, unique configuration function, no site restrictions, widespread application, stable and reliable operation, high space utilization rate, small land occupation, and environmental protection effect. It is a control center that commands the reasonable distribution of electrical energy among various components in the power supply line, reliably accepts the upper end power supply, and correctly feeds out load electrical energy. It is also the key to obtaining user satisfaction with power supply quality. Improving the operational reliability of power distribution boxes is the goal of creating high-quality projects.
The purpose of the distribution box is to distribute electrical energy reasonably and facilitate circuit opening and closing operations. Has a high level of safety protection and can visually display the conduction status of the circuit.
Working principle of distribution box
A distribution box is a low-voltage distribution box composed of switchgear, measuring instruments, protective appliances, and auxiliary equipment assembled in a closed or semi closed metal cabinet or screen according to electrical wiring requirements. During normal operation, the circuit can be connected or disconnected using manual or automatic switches. When there is a malfunction or abnormal operation, use protective appliances to cut off the circuit or give an alarm. By using measuring instruments, various parameters during operation can be displayed, and certain electrical parameters can be adjusted to prompt or signal deviations from normal working conditions.
Instructions for using distribution boxes
(1) The construction power distribution system should be equipped with a main distribution box, a distribution box, and a switch box, which should be arranged in a hierarchical manner according to the "general distribution box" sequence and form a "three-level distribution" mode. (2) The installation positions of each distribution box and switch box in the construction power distribution system should be reasonable. The main distribution box should be as close as possible to the transformer or external power source to facilitate the introduction of power. The distribution box should be installed as much as possible in the central area where the electrical equipment or load is relatively concentrated, to ensure that the three-phase load is balanced. The installation position of the switch box should be as close as possible to the controlled electrical equipment according to the on-site situation and working conditions. (3) Ensure the three-phase load balance of the temporary power distribution system, and form two power circuits for power and lighting on the construction site. The power distribution box and lighting distribution box should be set separately. (4) All electrical equipment on the construction site must have their own dedicated switch boxes. (5) The boxes and internal settings of distribution boxes at all levels must comply with safety regulations. Switching appliances should be labeled with their intended use, and the boxes should be uniformly numbered. Discontinued distribution boxes should have their power cut off and their doors locked. Fixed distribution boxes should be fenced and equipped with rain and impact protection measures. (6) The difference between a distribution box and a distribution cabinet. According to GB/T20641-2006 "General Requirements for Hollow Enclosures of Low Voltage Switchgear and Control Equipment", distribution boxes are generally used for household use, while distribution cabinets are mostly used for centralized power supply, such as industrial and building electricity. Distribution boxes and cabinets are both complete sets of equipment, and distribution boxes are low-voltage complete sets of equipment. Distribution cabinets have both high and low voltages.