junction box electrical box Introduction:
Made of strengthening ABS and PC material, the enclosure has beautiful appearance, high plasticity and doggedness. LWHY series junction box is suitable for terminal boxes, distribution panels, instrument boxes, electrical equipment boxes and control boxes. Moreover, it is simple and easy to use.The plastic plate makes it convenient to install all kinds of electronic components in the enclosure.The four corners of the box have mounting screw holes for the installation of wall brackets, which can be better installed on the wall under the premise of ensuring the waterproof capacity of the box.
Wiring of the junction box electrical box is to connect the voltage transformer and current transformer to the secondary circuit through the terminal series and parallel connection of the waterproof junction box, and then to the terminal of the electricity meter.The voltage circuit is directly connected to the electricity meter through the voltage terminal of the waterproof terminal box, and the current circuit is connected to the electricity meter in series through the two current terminal terminals and the connecting plate of the waterproof terminal box, which is used to meet the secondary current needs of serial connection or short connection.Three - phase three - wire waterproof junction box and three - phase four - wire test box connection mode is the same, three - phase four - wire than three - phase three - wire increased a group of current terminals.When the metering device is in normal operation, the wiring (such as low-voltage three-phase four-wire), the three-phase power supply voltage and the waterproof junction box voltage terminal are connected to the incoming terminal (lower end), the outgoing terminal (upper end) and the electricity meter.The right side of the three-phase current terminal is short-connected by connecting plates (two connecting plates increase the reliability of short-connection). The outgoing terminal of each phase current transformer (K1) is connected to the current coil of the electricity meter in series, and then the connecting plate is connected back to the end (K2) to form a closed loop.Field test metering device wiring (e.g., high voltage three phase three wire), watt-hour meter on-site checking instrument electric wire end in parallel with the waterproof connector, watt-hour meter on-site checking instrument of current line series access waterproof junction box two way current terminals, after connecting piece apart, two phase current transformer secondary current, respectively from the first end (k1) First, the current coil of the active and reactive watt-hour meter, and then return to the end (K2) through the current loop of the field verifier of the watt-hour meter.
The anti-reverse current components of the junction box generally use diodes. Due to the heat generated by the diode, hot spots will be generated on the back side. If the heat density of each hot spot becomes larger, the temperature of the diode itself will become higher. The temperature in the Junction Box Electrical Box will rise due to this effect. Also, when the junction box is installed outdoors, it may be 10-20 degrees Celsius higher than indoors under direct sunlight.
Based on the above reasons, as a heat dissipation countermeasure, it is desirable to choose a metal case with high thermal conductivity. In case of abnormal heat generation due to poor contact or other reasons, a fire can be minimized.
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