Working principle of junction box of meter box

The junction box is one of the auxiliary materials for electricians. Because the wires in the electrical circuit are threaded through pipes or cable trays, the junction box is used for transition at the junction of wires (such as long lines or corners of wire tubes). The wire tubes are connected with the junction box. The wires inside the wire tubes are connected in the junction box to protect wires and connect wires. This is the junction box.

Today, the meter box factory is here to introduce the working principle of the watt hour meter junction box in the plastic meter box:

The three-phase four wire junction box of watt hour meter is a new product that has been upgraded from the old bakelite products; The insulating material is made of imported polymer polycarbonate, which has good electrical and mechanical properties (solving the problems of old bakelite products such as brittleness, fragility, mildew after long installation time and water absorption). The metal parts are made of copper alloy and processed by imported automatic equipment. The metal surface is also nickel plated for protection. It has the advantages of safety, reliability, beauty and atmosphere. It can be connected to 4MM lines, with a current of 20A and a voltage of 660V. It can work normally within the range of - 40 ℃ to+60 ℃. Its voltage circuit uses one in and three out, and each phase voltage. The current has phase sequence identification, which is convenient for wiring and avoids metering errors caused by wrong phase sequence connection. The transparent cover of the junction box is fixed with two sealable screws, solving the problem of electricity theft prevention. In the secondary circuit, the wiring of electrical equipment such as watt hour meter, electrical instrument and relay protection screen can be safely replaced or inspected on site under any circumstances, which ensures the personal safety of staff and improves the working efficiency on site.