Electrical workers all know that the connection of power distribution cabinet wires occupies a large proportion in the work of electricians. : 100%; box-sizing: border-box !important; word-wrap: break-word !important; color: rgb(63, 63, 63);">There are relative specifications for the wiring of craftsmen, almost all of them are based on The wiring that realizes the electrical control function as the main body, but looking back, the wiring of the electrical distribution cabinet also has certain standards and specifications.
1. Precautions for wire connection of power distribution cabinet:
1， The first is to ensure that the cross-section of the wire can carry the normal working current, which is the same as the loss and heat of the components in the cabinet, so that the temperature is higher than the outside of the cabinet, leaving enough margin. For the wire connection of the control circuit, the requirements for tensile strength under special conditions should also be considered.
2， There are buttons and other components on the cabinet door of the control cabinet, which makes the placement of the spare wire on the cabinet door extremely necessary. Because it is very possible to modify and increase the circuit according to the actual working conditions on the spot, and the wiring harness on the cabinet door is usually protected by the winding tube, which makes the situation of adding wires to the components on the cabinet door on the spot is special. trouble. Therefore, the color of the spare line is also very conspicuous yellow, so that the modified and added circuits in the cabinet will be clear at a glance.
3，Controls wire termination Special copper fittings and matching standard crimping tools must be used. It was found in the manufacturer that the processing of the wire end of the control line actually used the cutting edge of the diagonal pliers for shearing crimping or the force plane of other pliers for flat pressing crimping. But the biggest problem with using these methods is that the crimp quality of each wire end connector will vary greatly with the operator's own grip strength and the operator's wrist fatigue. Excessive grip will cause the copper connector to be cut along with the copper wire. If the grip strength is smaller, it can only ensure that the copper connector is not separated from the copper wire temporarily, but these problems will not be found at all during general inspection, which will bring more "test questions" to the complex on-site maintenance. ". Naturally, there is no guarantee of product quality.
Second, the standard for wire connection of power distribution cabinet:
1， The minimum cross-sectional area of the insulated conductors of the switchboard shall be 1.0mm². For low-level electronic circuits, conductors with a cross-sectional area of less than 1.0mm² are allowed (but not less than the requirements of the electronic equipment manufacturer for the cross-section of the installed conductors). When the cross-sectional area is not greater than 8mm², its bending radius should be greater than 3 times its outer diameter. The transition wires of moving parts such as switchboard panels should have sufficient windability.
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