Hello everyone, I'm Brother Xue. In the electrical installation construction, if the connection between the distribution box (cabinet) and the bridge is not treated, the outer insulation layer of the laid wire and cable will be easily cut or thinned around the cut hole and the burr left, causing leakage or short circuit accidents, so the cable needs to be protected.
Two case practices are shared below.
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#1一体化预制
The first practice shows the integrated construction method of distribution box and bridge adopted by China Construction Third Bureau and Third Company, which is processed by the supplier at one time, and the box and cabinet do not need to enter the site for secondary cutting and processing; The connection quality of the box, cabinet and bridge is beautiful and the seams are neat; Eliminate the hidden danger of damage to the protective layer of wires and cables due to cutting burrs and corners.
Integrated construction of distribution box and bridge
Key points of construction method
1) First of all, do a good job of accurate planning, according to the distribution box, cabinet in and out of the cable, the total amount of wires to determine the size of the bridge, and then determine the size of the opening of the box, cabinet and bridge connection;
2) Plan the distance between the bridge and the wall or what kind of bracket form the bridge uses in advance, so as to determine the specific position of the opening at the junction of the box, the cabinet and the bridge, and send the data to the distribution box supplier;
3) The distribution box supplier will be prefabricated and processed in place at one time, and sent to the construction site for assembly and installation.
Interior view
Upper view
#2安装连接件
The second practice shows the construction method of installing connectors adopted by Shandong Dejian Group, and the connection between the distribution box (cabinet) and the bridge can be installed according to the size of the bridge, and the connector that can protect the wire and cable can not only ensure the integrity and electricity safety of the wire and cable in the installation and use process, but also realize the tight and reliable connection between the bridge and the distribution box.
Use an arc outer hem to protect the plate
Use the same material of electrical bridge to make connectors, connectors are made of a plurality of fixed plates to form a rectangular structure, the upper part of fixed plate is provided with the protection plate of outer folding edge, form a smooth arc, when the wire and cable in the bridge enter the distribution box, cabinet, contact with the arc outer folding edge protection plate of protection device, can make the wire and cable not be damaged, and the integrity and electrical safety of the wire and cable are guaranteed.
Schematic diagram of the connection
Control the size of the interface
According to the size of the bridge, the wire and cable in the bridge enter the distribution box, the position of the cabinet, open a mounting hole with the same cross-sectional area as the bridge, and insert the connector with the same inner diameter of the bridge into the installation hole of the bridge from the distribution box and cabinet, and the opening of the distribution box should strictly correspond to the size of the connector and the size of the bridge to ensure that the interface is tight.
Example of a connector
Bolt fastening
Use connector to install bridge and distribution box, connector is inserted into bridge from the installation hole of distribution box and cabinet, and a plurality of bolt holes are arranged on the protection plate and fixing plate of protection device. Use bolts to fix the connectors and bridges, distribution boxes and cabinets together to ensure that the connection is safe and reliable.
Example of connector installation
Through the installation of simple and easy-to-use connectors, when the wires and cables in the bridge enter the distribution box (cabinet), they are in contact with the arc outer folding protection plate of the connectors, and the wires and cables are not damaged, so as to ensure the integrity of the wires and cables, the size of the distribution box and the size of the connectors, the size of the bridge are strictly corresponding, the interface is tight, and the bolts fix the protection device and the bridge and the distribution box (cabinet) together, and the connection is safe and reliable.
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